electric logs of south luisiana

8/16/2019 Electric Logs of South Luisiana

1/110

ELECTRIC

L O G S

S O U T H

O

L O U I S I A N A

THE

PREPARED AN D PUBLISHED

by

NEW ORLEANS GEOLOGICAL SOCIETY


2/110

EDIT O RS AND CHAIRM EN

Wi l l iam S. Shaw

John S. Fischer

Frank S. Pons

Edi tor and Ge nera l Cha irman

Assistant Edi tor

V i ce Ch a i rm a n

SUBCOMMITTEE CHAIRMEN

Frank S. Pons

Ear le F. T ing ley

I. D. Simpson

A. T . Green

L i t h o lo g y

Formation Fluids

Muds

M isce l l a n e o u s

R. M. Bane

A. L. Backlund

Co L. Blackburn

J. E. Davis

T. R° Eskrigge

E. R. George

J. P. Hansen

T. J. Hoz

CO M M IT T EE M EM BERS

R. M. Jemison, Jr .

W. L. Laf l in

Jo C. Langford

J . J . M a r i c e l l i

J . F . McCIoskey

D° V . McLendon

J . D. S i l ve rna i l

R . G . Voe lke r

R. R. Wil l iams


3/110

INTRO D UCT I O N

Th is vo lume was o r i g in a l ly conce ived as a co l lec t ion o f "unusua l " e lec t r i c logs . An

unusual log was ge ne ra l ly understood as a log that exh ib i ted some com binat io n o f low

spontaneous po ten t ia l and low res is t iv i ty opposi te an o i l or gas prod uct ive sand. A

non-p rod uc t ive sand exh ib i t in g good spontaneous po ten t ia l and r e la t i ve ly h igh res is -

t i v i t y on an e le ct r ic log was a lso considered "unusu al" s ince th is is a comm on response

to a p roduc t ive sand . As the com p i la t ion p rog ressed it became apparen t tha t m os t e lec -

t r i c logs fa l l in to sys temat ic pa t te rns con t ro l led p r imar i l y by l i t ho logy and fo rmat ion

f lu ids , and d r i l l i n g mud s . The ob jec t i ve evo lved in to an a t tempt to assemblea g roup

of examples wh ich w ould demonst ra te the mo re or less systemat ic va r ia t ion in response

to va ry i n g co m b in at io n s o f l i t h o l o g y , f o rm a t i o n f lu i d s a nd d r i l l i n g m u d s . As m a l l

group of misce l laneous examples, the on ly t ru ly "unus ual" examples, have a lso been in-

c luded .

The de tec t ion o f f lu i d hydrocarbons f rom the e le ct r ic log is the pr ime co ncern o f the

geo log is t , bu t because the fo rmat ion f lu id is on ly one o f several fac to rs wh ich de te r -

m ine the re s is t i v i t y and spontaneous po ten t ia l o f the fo rma t ion , the in te rp re te r can be

ser iously mis led. The co m pi la t ion is usefu l because i t w i l l sh arpen the geo log is t 's

awareness o f the many p i t fa l l s in e lec t r i c log in te rp re ta t ion .

Dur ing the pas t decade a va r ie ty o f eva lua t ion too ls have been deve loped wh ich use

el ec t r ic a l , rad ia t ion and sonic measurements, p lus che mic a l ana lys is o f the mud st ream,

cu t t ings and co res . W hen these too ls a re p roper ly se lec ted and in te rp re ted , fo rmat ion

eva lua t ion is a h igh ly dependab le and e f fec t i ve op era t ion . The ma jo r p rob lem now is

to de te rm ine wh a t too ls to app ly . Excep t ing the con t inuous ana lys is o f mud and cu t t -

ings the se lec t ion o f add i t iona l too ls i s based on the in te rp re ta t ion o f the e lec t r i c log-

g ing . I t is a t th is po in t tha ta b road know ledge o f the poss ib le co nd i t ions a f fe c t ing the

e le c t r i c a l measurements w i l l com e in to p lay and th is i s p rec ise ly the a im o f the d iscus-

s ion and examples to fo l low.

The vo lume is organ ized in to two parts . The f i rs t part is a rev iew of the basic factors

a f f e c t i n g t h e e l e c t r i ca l m e a su re m e n ts . G ra p hs i l lu s t ra t e t he va r i a b i l i t y o f e a ch f a c t o r

and sp ec i f ic examples are located on the graphs. The graphs are wo rth s tudying c los e ly

to fu l l y apprec ia te the sys temat ic va r ia t ions men t ioned above . There fo l low sa b r ie f

summary o f fo rmat ion eva lua t ion too ls , and f in a l l y a genera l approach to we l l s i t e eva lu -

at io n o f the e le ct r ic log. The second part conta ins the examples w hic h are grouped

accord ing to ma jo r fac to rs a f fec t ing the e le c t r i c a l measurem ents . The examp les a re in -

dexed by le t ter and number as fo l lows:

L i tho logy

Formation Fluids

Muds

M isce l l a n e o u s

(L-1 to L-16)

(F-1 to F-lO)

/W-1 to/V~ 7)

( X - l t o X - 8 )


4/110

The index map shows the loca t ion o f each examp le .

A c om p i la t i o n o f abbrev ia t i on s and symbo ls used in the d i scuss ion and examp les i s ap-

p e n d e d . Du r i n g th e co l l e c t i o n o f d a ta , e sp e c i a l l y co r e d e sc r i p t io n s , t h e co m mi t t e e

found a bew i lde r in g ~ar ie ty o f abbre v ia t i ons and symbols des igna t ing the sam e i tem.

A great e f for t was made to standard ize these For the purposes o f th is vo lume and to th is

end a ra the r com p le te l i s t oF abbrev ia t i ons and symbols was com p i led . The o rde r o f des-

c r ip t i on For co res a l so va r ied w ide ly and was o f ten am b iguous . In many ins tances i t

cou ld no t be asce r ta ined whe the r the F luo rescence repor ted re la ted to the d ry co re o r to

a cu t mad e f ro m co re m a te r i a l . T he co m mi t t e e d e c i d e d t o p u b li sh t h is co m p i l a t i o n a n d

orde r o f co re desc r ip t i on i n the hope tha t i t wou ld be used as a s tandard and the re by lessen

Fu tu re con fus ion and amb igu i ty .

I I I


5/110

AC K N OWLEDGEME NTS

The idea o f p repar ing a vo lum e o f e lec t r i c l ogs was o r ig ina ted by M r . T . H . Ph i lpo t t ,

Pres ident o f the New Or leans G eo log ica l S ocie ty, and h is Execut ive C om mit tee°

Succeed ing pres idents , Ju les Braunste in in 1961 and Leonard L. L imes in 1962, a long

w i th th e i r Execu ti ve Com m i t tees , fos te red the p rogress o f the vo lume. The ir coopera-

t ion and encouragem ent susta ined the com mit tee through m any problems.

The four subcom mit tee chairmen under took the re sp on sib i l i ty o f assem bli ng examples

re la ted to the fou r major categor ies. The com mit tee m embers sought out the examples

and prepared them to the speci f icat ion s established by the comm ittee. The examples

conta ined in Pa r t I I are the core of th is vo lume, and i t was the in terest and cooperat ion

of the com mit tee m embers and other contr ibutors that made i t possib le .

Two com m ittee m embers deserve specia l me nt ion. Fr an k S. Pons under took to superv ise

the F ina l check ing and d ra f t ing o f the exa m p les . Jo hn S. F i sche r p repared m ost o f the

discussion in Par t I . The w r i te r is indebted to M essrs. Fisc her and Pons for the i r in va l -

uable a ss is tance in th is regard.

W. S. Shaw

IV


6/110

T A B L E O F C O N T E N T S

E LE CTR IC L O G S O F S OU T H L O U I S I A N A - C O M M I TT E E . . . . . . . . . . . . . . . . . . . . .

I N T R O D U C T I O N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

P a g e

I

II

A C K N O W L E D G E M E N TS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IV

TAB LE O F C O N T E N T S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V

PART I

A . F A C TO R S A F F E C T I N G S P O N T A N E O U S P O T E N T I A L A N D R E S IS T IV IT Y . . . . . . 1

1. S po nta ne ou s P o t e n ti a l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

2 . R e s is t iv it y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

B. F O R M A T I O N E V A L U A T I O N T O O L S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1. E l e ct r i ca l Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2. I n d u c t i o n -E l e c t r i c a l Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 . M i c r o lo g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4 . C a l ip e r Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 . S on ic V e l o c i t y Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

6. G am m a R ay Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

7 . M u d Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

8. C o r in g a nd C o re A n a ly s is . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

9 . W i r e l ln e F o rm a t io n T e ste r . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

C . IN T E R P R ET A T IO N A T T HE W E LL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

PART I I

I N D E X M A P O F S O U TH L O U I S I A N A - S h o w in g E xa m p le L o ca tio n s

L I T H O L O G Y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E xam ples L -1 to L -1 6

F O R M A T I O N F LU ID S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E xa mp le s F -1 t o F - 10

M U D S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E xa m ple s M - 1 to M - 7

M I S C E L L A N E O U S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E xa m ple s X -1 to X -8

A P P E N D I X - A b b r e v i a t i o n s a n d S y m b ols

V


7/110

- I

[

L


8/110

A . F A CT OR S A F F E C T I N G S P O N T A N E O U S P O T E N T I A L A N D R E S IS T IV IT Y

Al l e le c t r i c logs consis t o f reco rd ings ve rsus dep th o f two bas ic m easu rem en ts-

Spontaneous P ote nt ia l (SP) and R esis t iv i ty .

1. S P O N T A N E O U S P O T E N T I A L

The Spon taneous Po ten t ia l is a na tu ra l l y occu r r i ng vo l tage in the bo reho le . Th is is

c rea ted in the ma in by cu r ren ts f l ow ing th rough the mud due to e lec t rochemica l reac t i on

a t sa n d -sh a le co n ta c t s a n d a t mu d f i l t r a t e - f o r m a t i o n w a te r co n ta c ts . An o th e r , r e l a t i ve l y

mino r , cause o f SP is the e le c t r ok ine t l c vo l tage due to the movement o f mud f i l t r a te

th rough the mud cake . S ince changes in the SP occu r a t sand-sha le con tac ts , the SP

log is a record o f l i fh o l og y in a sand-sha le ser ies.

Fac to rs A f fec t i ng the SP

The amo un t o f Spon taneous Po ten t ia l measu red in the bo reho le depends p r im ar i l y on :

a . Fo r ma t io n wa te r r e s i s t i v i t y - Rw

b . M u d r e s i s t i v l t y - Rm

c. Sha li ness o f sa nd - cc

d . Fo r ma t io n r e s i s t i v i t y - R

e . H o l e s i z e - d

f . De p th o f i n v a s i o n - D i

g . B ed t h i c kn e ss - e

F igu res 1 and 2 show the re la t i onsh ip o f fac to rs a , b , c , and d to SP de f lec t i on . Some

of the examp les have been p lo t ted on the cha r ts .

My.

I00

CL

¢0

1 80

o

a. 60

o

=o

o

l:

0

(sO

4 0

2 0

0

0

m

9,m ~ ~.0

©

/ ~ O h m - m e t e r s f _ ~

/ .028 .o 2

I I I ~ I

40 80 120 160 200

I~ 0 0 0 ppm N i l C I

R e s i s t i v i t y ( R w ) a n d S a l i n i t y o f F o r m a t i o n W a t e r

Figu re 1 - Va r ia t i o n o f Spon taneous P o ten t ia l w i th mud res i s t i v i t y (R m

wa te r r e s i s t i v i t y (R ) f o r c l e a n san d s.

W

) and fo rma t ion


9/110

1.0

.8

~ ) . 6

0

. E

O~

.4

0 1 I I I I

0 . 5 .2 I 5 20

.2

I 0 0

F o r m o t i o n R e s i s t i v i t y - R t

F i g u re 2 - V a r i a t i o n s o f A l p h a (S P R e d u c t io n Fa c t o r) w i t h p e r c e n t s h a le a n d fo rm a t i o n

res i s t i v i t y (R t ). Con d i t i ons : R sha le equa l s 1 and R /R i equa l s 1 .

2 . RESISTIVITY

R e s i s t i v i t y is a n i n ve r se f u n c t i o n o f th e a b i l i t y o f a m a t e r i a l t o c o n d u c t e l e c t r i c i t y .

Sa l t wa te r is a good con duc to r and the re fo re has a l ow res l s t lv~ ty. Hyd roca rbon s a re

i nsu la to rs and have a h i gh res i s t i v i t y . Th is res~s ti v lt y con t ras t be tween sa l t wa te r and

hydroca rbons i s t he bas is o f t he u t i l i t y o f t he res i s t i v i t y l og . A l t h ou gh the res i s t i v i t y

o f a f o rma t i on can be measured in seve ra l ways the fac to rs a f f ec t i ng res i s t i v i t y measure -

m e n t s a re c o m m o n t o a l l .

The t rue res i s t i v i t y (R ) o f a f o rm a t i on va r i es w i th :

a . P o r o s i t y -

b . Fo rm a t i o n w a t e r r e s i s t i v i t y - Rw

c . S a lt w a t e r s a t u ra t i o n - Sw

d. Presence o f sh a le - c~

T rue res i s t i v i t y (R ) i s a bas i c p rop e r t y o f a f o rm a t i on . I f we kn ow R t , and we can t i e

dow n the fac to rs a f f e c t i n g i t by o the r means such as the SP l og and a po ros i t y log1 we

can then so l ve fo r wa te r sa tu ra t i on . Th i s is t he measure o f wh e the r o r no t a f o rm a t i on

c o n t a i n s p ro d u c t i v e h y d ro c a rb o n s .

2


10/110

Appa ren t res is t i v i t y (Ra) wh ich is the read ing d i r ec t ly o f f o f the log , va r ies w i th :

a . Spacing o f logg ing too l d . Ho le s iz e - d

b. Bed th lc kn es s- e e . Res is t iv i ty o f surrounding be ds - R

s

c . D e p th o f i n v a s i o n - D i f . M u d r e s i s t i v i t y - R

m

These fac to rs wh ic h a f fec t the m easured res is t i v i t y (Ra) a re so w ide ly va r iab le tha t i t is

beyond the scop e of th is book to d iscuss them. Charts ca l led res is t iv i ty departure curves,

o r co r re c t ion char ts , a re ava i la b le in logg ing in te rp re ta t ion manua ls to co r rec t fo r these

factors.

F igu res 3, 4 , and 5 show how true fo rmat ion res is t i v i t y (R t )va r ies w i th po ros i t y , fo rma-

t ion wa te r res is t i v i t y , wa te r sa tu ra t ion , and sha le con ten t .

. . 2

¢r

i

e,.-

T,

Q )

E

i. . .

0

u.

3

) h m - m e t e r s . 0 8 5

I

0 3 0 0 p p m N a C l 4 0

%

. 0 4 7 . 0 3 5 . 0 2 8 0 2 5

I I I I

8 0 1 2 0 1 60 2 0 0

R e s i s t iv i t y ( R w ) a n d S a l i n i t y o f F o r m a t i o n W a t e r

OZ I

I

: ) 4 0

Figu re 3 - Va r ia t ion o f res is t i v i t y o f a sa l t wa te r sand w i th po ros i t y ( ~ ) and fo rma-

t ion wa te r res is t i v i t y (Rw) .


11/110

I 0 0

\ ~ , ~ . . . .

W a t e r

P r o d u c t i v e

o H y d r o c a r b o n ~

P r o d u c t i v e

I I I I I

0 ' 10 2 0 4 0 6 0 8 0 I 0 0

W a t e r S a t u r a t i o n - S w

°/o

F i g u r e 4 - V a r i a t i o n o f fo r m a t i o n r es i s t iv i t y (R t) w i t h p o r o s i t y ( ~ ) an d w a t e r s a t u r a -

t i o n ( S w ) . Co n d i t i o n : Rw e q u a l s . 0 3 .

I 0 0

E

I I 0

:>

¢o

¢g

n-

o I

E

0

LL

,I 0

R e s i s t i v i t y o f S h a l e

° / o S h a l e

I 0 0

F i g u r e 5 - Va r i a t i o n o f f o r m a t i o n r es i s t i v i ty ( Rt ) w i t h s h a l e co n t en t fo r w a t e r an d h yd r o -

ca r b o n b ea r i n g s an d s .


12/110

B. F O R M A T I O N E V A L U A T I O N T O O L S

The eva lua t ion too ls descr ibed in the fo l low ing pa ragraphs a re those wh ich appear in

the examp les . There are o the r fo rmat ion ev a lua t ion too ls such as Format ion Dens i t y

logs, cont inuous d ipmeter surveys, ch lor ine logs, and others which are fu l ly descr ibed

in o the r pub l i ca t ions .

I . THE ELECTRICAL LOG

The Elect r ica l Log consis ts o f an SP curve recorded in the le f t han d t rack and severa l

res is t i v i t y cu rves . The res is t i v i t y cu rves on the E lec t r i ca l Log a re mad e by passing

e le c t r i c a l cu r ren t be twe en two e lec t rodes and measuring the vo l tage d rop across two

o the r e lec t rodes . Th is is p ropo r t iona l to the res is t i v i t y o f the fo rmat ion . The geom et r i -

ca l a r ray o f the e lec t rodes de te rm ines the spac ing o f the dev ice . Th ree spacings a re

usua l ly reco rded on the E lec t r i ca l Log :

a . 16" N o rm a l - sha l low inves t iga t ion , symm et r ica l cu rve , good

th i n be d d e f i n i t i o n .

b . 64" Norma l - med ium dep th o f inves t iga t ion , symm et r ica l cu rve ,

approaches t rue res is t i v i t y in th ic k , mod era te ly invaded sands .

c . 18 ' 8" La te ra l - deep inves t iga t ion , non-symm et r ica l cu rve ,

po in ts out th in res is t ive beds.

An am p l i f ied 16" Norm a l i s a lso ge nera l ly p resen ted .

2 . INDU CTION--ELECTRICA L LOG

In combina t ion w i th the 16" Norma l and SP cu rves the ind uc t io n log , as the " Indu c-

t ion -E le c t r i ca l Log" , has la rge ly rep laced the o r lg~na l E le c t r i ca l Log. i ts pu rposes

are the same but i ts measuring system is qu i te d i f fe re nt , and i t o f fers severa l ad van-

tages over the Elect r ica l Log.

The Induc t ion Logg ing dev ice em i ts rad io f requency energy f rom a t ransmi t te r co i l on

the too l . Th is RF energy se ts up eddy cu r ren ts in the fo rmat ion w h ich f low in a c i rc le

a round the bo reho le . These eddy cu r ren ts cause ad d i t iona l RF energy wh ic h is p icked

up by a rece ive r co i l on the logg ing to o l . Th is rece ived energy is p ropor t iona l to the

co n d u c t i v i t y o f t h e f o rm a t io n . Co n d u c t i v i t y i s t h e re c i p ro ca l o f r e s i s t i v i t y .

The Induc t ion -E lec t r i ca l Log consists o f the fo l lo w ing cu rves :

a. SP

b. 16" Norm al and am pl i f i ed 16" Norm al

c . Re c ip ro ca l Co n d u c t i v i t y ( In d u c t i o n re s i s t iv i t y )

d . C o n d u c t i v i t y

The co nd uc t iv i t y ( induc t io n) cu rve is a sym me t r ica l , deep inve s t iga t ion d ev ice and resis-

t i v i t y va lues approach ing R can be ob ta ined f rom i t in beds f i ve fee t th ic k o r g rea te r .

In beds o f low re s is t i v i t y , the cond uc t iv i t y cu rve g ives much g rea te r reso lu t ion than the

res is t i v i t y cu rves .

5


13/110

3 . M I C R O L O G

The M ic ro log cons is ts o f two ve ry shor t spac ing res is t i v i t y curves : ( 1 1 /2" La tera l and

2" Norm al ) . The se curves o f f e r a means o f de te rm in in g the re s is t i v i t y o f t he flushed

zone (Rxo). By know ing th is and the res is t i v i t y o f the inva d ing f lu id Rm f , we can ap p ly

a m od i f i ca t io n o f A rch ie 's Satura t ion Formula and ar r i ve a t a va lue o f poros i t y . Th is log

is usua l l y a good l i t ho logy dev ice and g ives de ta i led "sand count "

4 . CALIPER LO G

A c a l i pe r c u r v e i s us ua l l y l ogged a long w i t h e i t he r t he M i c ro l og o r s on ic v e l o c i t y l og .

I t is a log o f boreho le d iame ter and can be use fu l to t he eva lua t ion geo log is t f o r loca-

t ing permeable zones th rough the presence o f mud cake .

5 . S O N I C V E L O C I T Y L O G

The son ic ve lo c i t y log i s a log o f the t rave l t ime o f sound th rough one foo t o f f o rm at ion .

Th is in te rva l t rave l t ime i s p rop or t iona l t o poro s i t y . The s im p l i c i t y o f poros i t y de te rm in a-

t ion and thence sa tu ra t ion w i th t he son ic ve loc i t y log has led to it s rap id r i se in usage. On

the log , in te rva l t rav el t im e increases as po ros i ty increases.

6. G A M M A R A Y L O G

The gamma ray log is a log o f t he na tura l l y occu r r ing ra d io ac t i v i t y o f the fo rmat ions .

Because rad ioac t i ve m inera ls a re depos i t ed p re f e re n t ia l l y w i t h shales r t he gamma ray log

in a sand-sha le series is a good l i t ho log y too l . I t has the advantages o f be ing obta lnab le

th rough cas ing and no t be ing a f fec ted by e lec t r i c a l p roper t ies o f muds and fo rma t ion

f lu ids . On severa l o f the examples the gamma ray log g ives a good l l t h o lo gy p ic tu re

where the SP is feature less.

7 . M U D L O G

The mud log is a m anu a l l y cons t ruc ted log based on cu t t ings and mud ana lys is wh ich is

prepared da i l y wh i le d r i l l i ng i s in p rogress .

The pr inc ipa l observa t ions a re :

2.

3.

Penet rat ion rate in minutes per foot or feet per hours .

L i t ho logy in percentages .

D r i l l ing f lu id measurement - c on t i nuous l y .

a . Percent o i l i n cu t t i ngs .

b. Tota l gas unl ts in mud and cut t ings .

c . Compo nent ana lys is o f gases . (Metha ne th rough Butane)

d . Ch lo r ide o r sa l t con ten t .

This ev id en ce is presented d a i ly on a 5" and 1" log. The imp or tance is to in form the

opera to r o f cor re la t i ve o r cor ing markers and hydrocarbon bear ing zones pr io r t o t he

e le c t r i c log run . In t he event t he ho le i s lost be fo re e le c t r l ca l e va lu a t io n , t he adva n-

tages o f th i s in fo rm at ion rece ived by the ope ra to r i s qu i t e app aren t .

6


14/110

8. C O R I N G A N D C O RE A N A L Y S I S

Cor ing is the best me thod o f ob ta in ing p hys ica l samp les o f the fo rm a t ion . Thes e can be

ob ta ined by two methods:

a . S i d e w a l l c o r i n g - w l r e l i n e t o ol s

b . C o n v e n t i o n a l c o r i n g - c u t w h i l e d r i l l i n g

These samp les , a l thoug h f lushed to some degree by the d r i l l i n g f l u ids , can be ana lyzed

to p r o v i d e su ch u se fu l e va l u a t i o n i n f o r ma t i o n a s:

a . L i t h o l o g y

b. Porosi ty

c . P e r m e a b i l i t y

d . F lu id Sa tu ra t ions

9 . WIRELINE FO RM AT ION TESTER

The w i re l i n e fo rm a t ion tes te r i s a too l w h ic h can be used in bo th open and cased ho les

to recover phys ica l samp les o f the fo rma t ion f l u ids and to measure bo t tom ho le fo rma-

t i on p ressures. I t does no t p rov ide a tes t o f an en t i re zone bu t the s ing le p o in t tes t

can be ex t rapo la ted in many cases to cove r l a rge r i n te rva l s . I t is a l so used to p rov ide

i n fo r ma t i o n a bo u t t h e l o ca t i o n o f f l u i d co n ta c t s a n d tr a n s i t i o n zo ne s . T he f l u i d r e co ve r y

p e r m i t s co m p u ta t i o n o f g a s -o i l r a t io s , a n a l ys is o f f l u i d q u a l i t y , a n d d e te r m i n a t i o n o f o l l

g r a v i t y . T h e p r e ssu r e i n f o r ma t i o n ca n be u se d t o i n d i ca te p e r m e a b i l i t y , l o ca te d e p l e te d

zones and co r re la te them f rom w e l l to we l l , and ind i c a te abno rma l p ressu res as an a id to

co mp l e t i o n t e ch n i qu e s a n d f u tu r e d r i l l i n g p r o g r a ms .

7


15/110

C. INTERPR ETATION AT THE WELL

As can be seen f rom the examples in th is vo lum e, there are w ide ranges in the response

o f t h e E le c t r i ca l Lo g a n d t h e In d u c t i o n - E le c t r i ca l Lo g . I n t e rp re ta t i o n o f e l e c t r i c l og s

and associa ted serv ices ava i lab le for format ion eva luat ion is far f rom an exact sc ience

and the re may be va r ia t ions in loca l g round ru les concern ing in te rp re ta t ion f rom one

area to ano the r . How ever , the re a re some bas ic s teps w h ich should be fo l low ed fo r tho-

rough and e f fec t i ve eva lua t ion o f a we l l by logg ing methods .

To star t , i t m ust be obvious that no one too l can furn ish a l l the data needed for ade-

qua te in te rp re ta t ion . The two bas ic qua n t i t ies needed to te l l whe the r o r no t a zone is

p roduc t ive a re :

a . Po ro s i t y -

b . W a te r sa t u ra t i o n - Sw

There are some basic formulas re la t in g these factors to re s is t iv i ty:

1. F= R /R w (de f in i t io n o f Fo rmat ion Fac to r )

2 . F= 1 /# 2 ( th is is approx imate)

3. Sw2 = R / R t ( i f po ros i t ies are constant)

Formulas 1. and 3. can be ap pl ied whe n a c lea n, homogeneous sand conta ins both hydro-

carbon and w ate r co lumns. Since th is case is not a lw ays seen, po rosi ty con t ro l must

usual ly be obta ined f rom another source.

Af te r runn ing the e lec t r i c log and i t i s co r re la ted w i th ad jo in ing w e l l s , i t should be exa-

m ined fo r l i t ho log y . I f none o f the sands have over O. 35 ohm-mete rs res is t i v i t y , and

none o f the sha les show any changes in re s is t i v i t y , the w e l l i s p roba b ly n on-p rodu c t ive

to th is dep th .

I f some ques t ionab le res ls t i v i t les a re no ted , some poros i t y c on t ro l log such as the son ic

ve loc i t y log shou ld be run .

Wi th po ros i t y con t ro l a res is t i v i t y index ( I ) examina t ion can be made. In zones o f s im i -

la r po ros i ties , the ra t io o f the res is t i v i t y o f the sand in ques t ion to tha t o f a wa te r sand

(Rt /R o) can be obta ined . I f th is ra t io is over two , the zone should be examined fur the r.

I f the ra t io ( I = Rt /R o) is grea ter than three, the zone should be pro du ct iv e. A m ethod

o f compar ing zones o f d i f f e ren t po ros i t ies in a s im i la r manner i s ca l led apparen t wa te r

res s t iv i ty (Rwa) compa r ison.

Any in te res t ing zones uncovered by the above m ethods can be fu r the r inves t iga ted w i th

s idewa l l co res and the w l re l lne Format ion Tes te r .

8


16/110

I f accura te va lues o f e f f ec t i ve poros i t y and percentage sha le con ten t a re needed fo r

reservo i r ana lys is , a new dev ice ca l le d the Format ion De ns i t y Log has rec en t l y been

in t roduced . I t shows grea t p romise in t h i s a rea . I t i s a l so an exce l len t l i t ho log y

cont ro l l og . Sha ly sands hav ing l i t t l e o r no SP shou ld be inves t iga ted fu r ther w i t h t h i s

log and the Gamma Ray Log.

Prob lems in cor re la t ion such as fau l t s , channe l and bar t ype sands , and s t ra t ig ra ph ic

changes can o f ten be reso lved w i th use o f the Cont inuous D ipm eter . New methods o f

c om p u t a t i on , i nc l ud i ng c om pu t a t ion by D ig i t a l Com pu t e r , and im p roved i n t e rp re t a t i on

have inc reased grea t l y t he va lue o f t h i s t oo l .

Rem em ber , t ha t w hen a w e l l is d r i l l e d , v e r y o f ten it s on l y v a l ue w i l l be i n f o rm a t i ona l .

Once cas ing i s se t, o r t he we l l is p lugge d, t he oppo r tun i t y t o ga ther t h is in fo rm at ion

is severe ly l im i ted o r gone. The dec is ions made a t t he t ime o f eva lu a t ion a t the we l l

w i l l a f f ec t no t on l y the p res en t w e l l , bu t poss i bl y t he ev a l ua t i on o f fu t u re w e l l s i n the

a rea.

The re is p robab l y on l y one r u l e t ha t w i l l a lw ay s app l y to l og i n t e rp re t a t i on . Nev e r

a t temp t t o over -s imp. i f X i t .


17/110

t

l

P T - I i

I

[

I

J


18/110

I I" I I "f l 1-- I-II~FIJ -- I I Ill l

I S S I S S I

v E A S T

F E L l C I A N A

E A S T

A T O N

N O U G E

H E L E N A

L I V I N G S T O N

~

AREA

6

L

F

f

£RST CAIIEIION AREA

i

__J

V£NMIUON AREA

L _ V - - I

SOUTH

NANSNI~LAND

AREA

@

p

E U E N £ I SL AND AREA

_ __.7

T E n G E 8 0 S N

E X

SNI P SHOAL AREA

__[

P P

£

q

W A S H I N G T O N

S T T A M M A N Y

L ANE POWT CHART RAI N

0

6

~

T B E N N A N O

BAY I I &RCNAI I D

AREA

\

I C 0

SOUT H T I NNAL I ER ANEA

I-

F

V

t_J-

PRAND L£ ANE~

WEST OEL T A AN£ A

•

O I IN D A R E A / . - I ~

o f

SN£ TON OUNO 1 1 . 4 / 1 1 PASS

m S

SOUT N PI SS_ AREA; - -

J

j

½

A R E A

1.__

1_

_ _ J

L I T H O L O G Y

L-1 EastM u d

Lake

L -2 H i c k o ry B ranc h

L -3 Go A round B ayou

L- 4 E uge ne s la nd B I k . 32

L-5 Savoy

L -6 Wes t B l ac k B ay

L-7 Grand Bay

L- 8 We s t De l t a B I k . 3 0

L - 9 Ma ur ic e

L - ] 0 Bonne t Ca r re

L - ] 1 Ana c oc o Are a w i ldc a t

L- 12 La ke

Washington

L-13 Grand Is le B Ik . 18

L- 14 Lit t le Bayou

L- 15 Cameron Meadows

L- 16 P ecan Lake

F OR MAT I ON F L U I DS

F- 1 V e n ic e

F - 2 V e n ic e

F-3 Sect ion 28

F-4 Sect ion 28

F - 5 Ba y ou G e nt i l l y

F-6 Luling

F-7 Liret te

F - 8 E uge ne s la nd B I k . 5 8

F - 9 E uge ne s la nd B I k . 1 2 8

F-10 Eugene Is land BIk . 126

MUDS

M - 1 B a y o u C hoc t aw

M - 2

E uge ne s la nd

BIk. 12

M - 3 E uge ne s la nd BIk. 12

M - 4 A v e r y

Is land

M - 5 O a k l e y

M- 6 E . Le e v i l l e W i ldc a t

M - 7 W i l d c a t

MI SC EL L AN EOUS

X - 1 We e k s s la nd

X-2 Lake

Washington

X - 3 L u l i n g

X -4 L ak e

Washington

X - 5 E uge ne s la nd B I k .

X - 6 E a s t La k e P a lourde

X -7 Garden C i t y

X-8 Lac B lanc

17

I N D E X M A P

E L E C T R I C L O GS O F S O U T H L O U I S I A N A

o

N EW OR L EAN S GEOL OGI CAL . SOC I ET Y

1 9 6 5

n

i i i i i


19/110

L I T H O L O G Y

L i t h o l o g y , a l o n g w i t h f l u i d co n te n t , is o n e o f th e ma jo r p a r ame te rs t o be d e te r m i n e d

f rom the e lec t r i c l og . The s imp les t w ay to l ook a t the l i tho log y p rob lem i s to con .-

s i d e r a n e l e c t r i c l o g o f a l t e r n a t i n g , t h i c k , c l e a n san d s a n d sh ale s . An y ch a n g e fr o m

th i ck t o t h i n , c l e a n t o sh a l y , o r t h e a d d i t i o n o f ma te r i a ls o th e r t h a n sa n d a n d sh a le

w i l l co m p l i ca te t h e i n t e r p r e ta t i o n o f t h e lo g .

Ever yo n e is f a m i l i a r w i t h t h e e l e c t r i c l o g o f a t h i c k , c l e a n h yd r o ca r bo n be a r i n g sa nd .

I f th in sha le l amina t ions a re added , the appearance o f the l og o f the sand i s changed

sl ig ht ly as in L-1. The am pl i t ud e o f" the SP and re s is t iv i ty curves decreases as sha le

con ten t inc reases and beds become th inn e r as in L -2 , L -3 , and L-4 un t i l the sand is

a l mo s t i n d i s t in g u i sh a b l e a s in L -5 . An e x ce l l e n t e x a m p l e o f a sa n d sh a l i n g o u t

l a t e r a l l y w i t h i n a n o i l f i e l d is g i ve n i n L -6 .

C h an g es i n p e r m e a b i l l t y a f f e c t t h e r e s i s t i v i ty cu r ve s g r e a t l y . As p e r m e a b i l i t y de c re a se s ,

i r red uc ib le wa te r sa tu ra t i on i nc reases. Th is lowers res i s t i v i t l es i n hyd roca rbon bear -

ing sands as in L -8, L-9, and L- 10.

The ad d i t i o n o f l lme as i n L -11 , o r o the r res i s t ive m a te r ia l s as i n L -12, w i l l i nc rease

res i s t i v i t l es . A po ros i ty con t ro l l og must be used to d i f fe ren t ia t e p ro du c t i ve and non--

product ive zones in these cases.

C o n d u c t i ve m i n e r a ls su ch a s p y r i t e s i n L -1 3 w i l l a f f e c t t h e l o gs i n a n u n p r e d i c t a b l e

mann er . Us ua l l y the SP cu rve is mos t a f fe c te d .


20/110

L

~

-

E

~

.

~

o

"

~

a

a

o

•

O

"

-

~

-

0

-

0

~

~

u

"

0

0

C

0

-

O

~

c

o

_

u

~

-

•

~

0

0

~

"

0

r

~

~

0

o

L

E

o

.

_

7

'

-

a

•

0

"

0

O

r

-

-

-

0

-

•

r

_

_

~

~

r

~

•

~

~

~

~

~

-

=

.

~

.

_

~

.

s

°

o

~

~

~

O

;

O

;

~

)

~

-

O

~

'

-

~

•

0

~

~

g

6

2

-

-

o

i

1

e

o

~

~

a

>

,

-

~

2

~

o

~

•

e

e

(

1

.

~

5

.

-

~

~

~

®

u

-

I

~

~

I

~

I

~

~

Z


21/110

i

°

~

L-1: Magnolia, Lutcher No. C-7, 24-14S-11W, East Mud Lake Field, 10,800-10,90


22/110

¢

N

Z

C

L

r

r

,

L

L

L

L

Z

L

~

J

Z

C

h

~

_

.

-

~

_

-

~

•

-

=

a

.

E

a

o

~

_

.

_

0

>

~

~

-

O

_

o

~

~

-

a

=

a

r

_

D

-

~

_

~

-

~

~

a

>

~

~

~

-

~

~

U

O

0

~

U

o

~

~

~

o

.

o

O

-

D

U

c

-

c

-

-

-

0

.

~

-

~

.

_

0

4

-

.

•

~

=

~

-

2

°

0

:

-

x

~

o

~

e

Q

.

c

~

c

.

~

r

~

~

.

_

.

~

~

~

.

,

0

d

0

0

o

uo

I

D


23/110

-

¢

~

~

I

l

r

,

/

W

I

~

]

I

"

d

l

~

I

V

I

J

I

~

/

~

k

r

J

~

k

L

r

X

l

k

I

X

I

i

II

II

~

L

l

J

~

O

4

1

P

~

~

C

L

I

]

r

~

~

I

r

I

J

r

II

r

i

r

~

r

I

J

L

L

F

I

~

1

1

J

~

I

1

.

~

Y

l

X

I

I

J

J

#

J

J

M

~

~

1

1

r

T

r

r

~

i

~

i

i

r

II

1

I

k

~

I

~

a

X

I

~

~

~

r

[r=

q

i

r

r

I

"

V

.

L

T

I

1

I

r

~

~

[

M

I

I

~

b

I

I

q

%

1

i

I

I

~

~

I

r

I

~

I

k

~

¢

,

e

C

~

I

~

-

I

<

2

i1

_

f

K

m

"

I1

~

~

$

w

'

1

~

p

m

m

e

I

•

B

B

/

M

A

N

H

I

J

r

'

I

r

i

~

I

i

1

.

l

.

[l

I

i

i

I

1

1

I

.

~

I

i

I

I

I

I

i

I

I

I

I

1

I

I

1

I

,

I

I

~

K

I

4

~

L

I

~

q

I

T

1

~

I

I

[

I

i

1

I

I

1

1

I

i

i

I

I

I

I

I

]

1

I

I

I

J

~

~

I

1

I

I

I

1

~

]

1

I

•

"

"

'

4

4

~

1I

1

l

L

1]I

1

1

%

1I

I

I

i

~

I

~

,

1

1

NI

L

8

0

I

'

~

;II

L

I

.

I

iI

1

1

1

I

r

II

J

I

L

L

,

I

1

1

1

1

I

,

II

J

r

I

1

I

L

a

~

0

~

£

o

"

I

~

~

-

•

~

O

o

u

2

=

t

'

G

.

~

1

o

~

~

0

m

E

u

O-

~

_

L-2: Frankfort-Olin #1 Goldsmith Farms, 10-8S-9W, Hickory Brach Field, 8500-86


24/110

o

~

W

g

Z

~

O

•

-

N

~

.

-

8

•

0

~

-

~

5

0

.

4

t

N

>

~

~

~

~

_

0

~

0

>

~

L

N

~

~

~

0

-

~

>

>

~

~

.

~

~

o

~

o

o

r

~

~

~

o

O

~

o

~

O

+

e

_

>

O

~

O

.

~

o

~

o

~

O

.

_

O

=

~

o

8

2

.

U

(

1

~

"

~

•

~

0

CO

,

b

O

O

t

N


25/110

1

<

O

"

n

o

E

~

L-3: Kerr McGee et al #1 Miami Corp, 32-14S-4W, Go Around Bayou Field, 1


26/110

5

N

0

~

(

3

"

~

2

o

a

.

~

-

~

0

=

o

~

g

~

.

O

r

~

Od

O

o

o

E

00

-

0

0

.

=

~

ou

-

c

E

~

o

u

O

~

0

0

D

0

•

E

4

uuO


27/110

; CO RE ANALYSIS

SPONTANEOUSOTENTIAL

FIELD

E u g e n e

Island

Elk. 32

WELL Pure O i l S t .Lse. 833 No.A-2

Drilled195 ogged 1950

I

T~~~ L i m e B a s e

W,. 12.9 Vir

5 0 s ~ ~ .

or 8 . 4 C . C . Ph

Sal i n i ty

1850

PPM Ca. 10 s

Bit

Sire

Fm. T e m p 1 8 2

Rm

.5 a t 7 Rmc

Rmf

Perf

9644

98

MUD DATA

BOPD BCPD

MCFD

X B S a W

GLR 1740/1 GI 32 5

Choke

91

64 FTP

I5

ST&

SI HP

SIDEWALL

CORE

DATA

faor

odor f m fluor

C t

pa le

9 653

Sd f g rn , w/dk g ry

s l t

9 688

Sd g ry , f g rn , t i t e C

9 697 Sd

g ry ,

v/f

g rn ,

gd

od

Sd g ry , f gm a i r odo

f luor

Cut

p o l e

9 716

9 722

- Sd

It

g ry , v / f gm Cu

9 728

Sd

gcy, f g m ,

odo

9 736 Sd g r y , v / f g m Cut

W.H.

R i e n i e t s

Prepmed By

L-4: Pure Oil St. Lse. 833 No. A-2, Eugene Island Block 32 Field, 9600-9700 ft, Robulus mayer


28/110

~

N

L

~

m

Z0

k

c

II

L

eb

-

Z

L

J

©

U

.

Zob

I

0

~

~0

o

~

~

.

~

~

~

u

.

_

~

e×

e

o

I

u

(

3

'

0

O

0

O


29/110

1

c

q

'

L

~

=

r

~

~

R

i

=

b

~

I

/

J

J

l

l

p

I

i

J

i

d

J

l

J

,

+

-

~

~

-

~

J

r

J

/

J

r

r

~

'

J

J

~

L

~

J

I

J

[

J

]

~

~

I

r

~

I

]

i

r

r

~

]

J

]

]

r

]

/

i

I

I

I

r

i

}

l

r

l

I

F

I

l

I

[

l

E

l

E

I

(

F

F

I

I

F

I

I

I

F

I

I

I

r

I

r

l

i

p

r

l

I

I

p

I

I

I

[

]

H

F

L

I

L

l

I

J

l

I

L

I

I

[

I

L

i

,

I

t

i

K

m

u

S

E

o

m

O

C

N

S

F

Z

N

O

s

u

m

a

J

i

I

I

r

~

I

]

r

I

I

J

I

I

I

i

J

J

J

l

F

I

/

I

L

l

.

l

I

J

]J

.

=

c

L-5: Pan Am Unit S-1 Adin Fruge, 29-6S-2E, Savoy Field, 8800-8900 ft, No


30/110

,

0

Z0

C

m

L

"

~

~

o

0

eL

~

E

0

~

m

~

~

U

U

~

o

~

o

~

.

0

~

U

o

~

e

O

D

~

0

c

I

t?

>

c

O

4

~

~

e

r

d

i

1

c

~

,

~

O

e

-

0


31/110

P O N T A N E C ~ P O I E N n / ¢

MIGR OL OG C A L IP E R

? ' 6 9

SPONTANEOUS K)]lENI1AL

M I D ROLOG GA L l

SPONTANEOUS PO'IF.NnAL

M I D ROLOG GA LI PE R

il

_ ~o ~ +~ , %m : l - M I GROLOG CA l

s " H /' l l" I I . . . . . .

P Io q u e m i n e s , I n . MU D D A T A

T ~ P h o s p h o t e

B l o c k B o y W t i 0 . 7 V ~ . 4 8 L o B

o . m S t . L~ . Q Q m s a w _ _ c a , k . ,

L o w a _ _ ~ . . 7 R , ~ . 4 9

STATE POTENTIAL TEST

B i t ~ z e 9 7 / 8 7 . ~ _ _ D ~ , _ _ P . , ~ x I _ _ P i ~ S ~ e _ _

& ~ -- P a . _ L P ~ f B O P D _ _ B O ~O _

F r o. T a ~ 1 6 L ~ F M G D _ _ % l l ~ W _ _ G L R _ _ G ~ . _ _

. 3 0 C ko l~ _ _ F IP . __ S I 1P _ _ S I L

PA RI S H P l o q u e m i n e s , Lo .

T I T S - R 1 7 E

f iELD

W e s t B l o c k

Be y

WELL Gulf N(xl7 St . l_se.OQI95

I ~1 1~ 1 3 - 2 4 - 5 8 ~ _ _

M U D D A T A

T v~ , Ph o sp h o t e

Wt. 1 0. 7 V is . ~ ~ _ _

m , . 94 e .~

. 8 5

STATE POTENnAL TEST I

8 . 0 R, . 7_ . _ P, , e BOP D _ _ e ~PD _ _ :

F r o. T m , , m l 6~ I V IC F D ~ B S &W G L R _ _ _ _ G f . _

j ~ ,~ . ,s o o , a . ~ _ _ S T e _ _ ._ ~ _ s m - r _~ _

I =A RI S H P l o q u e m i n e s , r e . M U D D A T A

T I 7S - R I 7E t ' y p , Wo t e r Bo se 6 e l

FIELDW e s t B l o c k B a y W t . 1 0 . 1 V k . 4 0 L o , _ _

W E L L~ S a l m ; ~ _ _ C o . o ~

D,11.x17-21-58

, . . _ . a _ _

Rm 1,8

Ib ~

R ~ _ _ ( 3 m ke _ ,9 _ ~r ~ __ F TP 9 0 0 ° ~ S I B ~ _ ~ D r i ll e d - 1 2 - 5 8 L o g g e d _ R B 1 . 5 4 R me . 8 8 _ R ~ . '/ ~5 ( ]m k e ~ F I P . ~ ~

L-6: Gulf No. 16, 17, 28, and 30, St. Lse QQ195, 17S-17E, West Black Bay Field, 8000-8100 ft, Bigenerina Florid ana


32/110

t

Z

O

C

3

b

Z

O

N

0

~

_

~

o

c

-

o

_

-

-

~

o

E

~

•

,

1

°

~

3

=

u

°

-

-

N

~

x

~

m

o

I

~

-

-

,

4

e

.

e

•

~

×

E

~

~

~

i

~

"

.

~

~

~

I

~

u

O

'

o

O

O

~


33/110

1

~

h0F

I

9

m

m

-

9

.

÷

I

~

~

~

I

M

A

R

I

N

E

i

o

1

3

m

¢

a

~

0

/

L-7: Gulf-G.L.P.D. No. A-52, DS-58, 48-20S-18E, Grand Bay Field, 9700-9800


34/110

z

0

-

n

O

D

e

O

-

O

-

_

o

-

g

~

.

_

.

~

~

o

.

-

6

"

.

"

0

0

e

'

_

C

-

-

>

.

0

m

m

•

-

c

0

0

u

~

~

Z

>

~

c

0

_

~

0

0

.

O

~

O

-

0

o

0

o

_

D

C

°

-

-

-

e

I

-

.

-

-

-

0

N

~

•

-

0

0

~

'

~

-

-

0

~

>

0

(

D

c

.

.

C

(

1

~

-

~

~

.

~

_

c

O

,

0

r

,

,

4

O

-

c

~

c

~

r

,

,

r

-

,

4

c

~


35/110

3

7

I

s

A

R

E

N

A

C

E

O

U

S

Z

O

N

E

Y

O

U

N

G

E

R

T

H

A

N

B

I

G

E

N

E

R

I

N

A

(

B

)

o

;°i

o

~

i

1

L-8: Continental Oil No. C-6 S.L. 970, West Delta Block 30 Field, 7600-7700 ft, 1st ArenaceoBigenerina (B)


36/110

Oi

C

IeI

Z

i

ZON

>

oo

u

o

>

,

4

°

N

m

°

m

o@cO

E

0

X

(

D

I

,

4

O

e

O

m

v

°

I

e

p

t

~

d

o

_

~

.

~

2

°

~

O

O

m

i

>

I

1

O

Q

~

E

o

O

O


37/110

Q

~

~

l

L

J

1

1

~

~

l

i

~

,

E

r

i

E

E

~

T

~

-

-

I

i

,

_

I

J

]

l

'

]

I

~

I

i

I

i

K

m

S

E

o

m

F

Z

I

B

L

A

J

I

L

l

E

H

L

[

l

I

~

1

~

~

~

%

l

~

~

~

I

~

~

~

A

~

i

l

~

~

~

~

~

I

i

I

l

1

I

i

l

L

1

k

Illl

lllll

L

[

il

i

l

l

l

l

C

LA

M

N

s

O

.

_

~

N

~

-

~

-

L-9: Continental No. 1 C. Savoy, 43-11S-4E, Maurice Field, 14600-14700 ft,


38/110

0

a

~

z©

(

"

~

I

I

L

r

v

LI

z

i

©

I

3

©

r

~

U

o

~

r

~

uE

D

u

°

~

_

QC

EO

o

-

I

0

-

3

(

3

U

t

~

-

0

(

°

~


39/110

RE

Z o ne _ _ _ D a

Pmf

B O P D

M C F D _ _ _ _

G L R

Q ,oke

g l i >

CUM UL AT I

To 3 - 1 - 6 1

7 2 , 3 3 3

SQUEEZ E

SIDE WA

9378- Sd; f t

calc, s li/shly;

Cut: am, gold

9380- Same

9382 Sd;f t

ta lc ; gd odor ,

gold f luor .

396-9406-

nclusive)

med/calc, s li/

f luor . C ut : m

9407 Sd;f t

calc, s ll/shly;

Cu~ m , gold

9409 Same

941 - Sd;f t

calc; gd odor,

gold fJuor.

9418- Sd; f t

gor, gd odor,

gold f luor .

9420-25-29

9432- Sd; f to

c aJ c . Cut : H

9436- Sd; f

None.

9437- Sd;f t

shly; gd odor,

gold f luor .

9440 Sdy s h

shly; poor sho

gold luor .

Cu

9442 Sd;f t

shly; gd show

Cut:am, gold

S t J o h n

p . l l S R g e . 7 E

D B o n n e t C a r r e

o . l U n i t 1 3 M o n t e c j u t

l e d 1 1 - 5 8 L o g e e d 2 - 2 0 - 5 8

M U D D A T A

T y pe Gel . I l l S l~ e 9 7 / 8"

W t . 10 .5 V is . 43_L L os s 6¢~ . _~ I~ .

Sal in i ty 18~ 000 ppm c a" Ions Fro. ~ 175°~ F

R m . 9 5 a t 1 7 5 R m¢ . 9 8 a t 1 7 5 R ~ . 7 8 a t 1 7 5


Z o,e 9400 'S d Dote 9- 59 per iod 0~2Qh~_~h~ ipe Siz e__

P e l f 9 4 2 9 - 3 4 B O P D 1 4 8 B C P D - -

M CFD 83___L ~ BS &W GL R 563 / .~ _L C~

C h o k e 7 / 64 " ch F T P 1 1 5 0 _ ~ S l l l P _ ~ _ _ S l B ~ _ _ _ ~

ACKNOW L EDC~ NIENr

s a ~ B y

R . G . V o e l k l r

P. . x=~ By

F. S. PONS

P A R I S H S t . J o h n

S e c . 6 4 T w p . I I S R g e . 7 E

R E L D B o n n e t C o r r e

W E L L F . A . C a l l e r y N o . I U n i t I I C a v a l l i n o

Dw i l lod 11- 58 ~ 11- 22 - 58

M U D D A T A

T y pe Nat ura l B i tSiz e 9/ 8 ' ~

Wt. I 0 . 5 Vis . 48 L ~ 3 . 8 ~ . 9 _ L

Siz l ini ty 181000 ppm Ca. Ions Fro. " re= ~ _

Rm 1.72 at 92 ° Rm c 1.31 at 152 Rm f 0 .762 Ot 152


Z o ~ 9 4 0 0 ' S d D o t e 1 2 - 3 - 5 8 P e r i od 2 4 h r s . P i p e S i z e _ _

pc,~f

9 4 0 8 - 2 0 B O P D 2 6 4 B r j = O _

M C F D I 3 0 ~ B S & W 0 G L R 4 9 2 - 1 G , . 5 7 . . 5 °

( 3r a ke 8 / 6 4 " F TP 1 3 7 5 S I 1 P ~ S I B H P ~

ACKNOWLEDGEMENT

Submitted By

R . G . V o e l k e r

P~o,,=,odey

E S . P O N $

IND E

L

L-10: F.A. Callery No. 1 Unit 13 Montegut, F.A. Callery No. 1 Unit 11 Montegut, 28-11S-7E, Bonnet Carre Field, 9400-9500 ft, Operculinoides


40/110

i

i

,

m

°

O

O

O

N

.~

O

Q

e

e

O

"

•

.

~

e

u

O

I

O

C

d

,

O

O0=

.

o

C

0

0

O

3

>

e

r

U

O

~

~

~

>

u

-

O

O

o

.

0

O

o~

o


41/110

i

L-11: La Long Leaf Lbr. Co. No. 1, 15-4N-9W, Anacoco Area Wildcat Field, 6900-700


42/110

Z

0

N

.

m

N

_

~

0

2

>

0

~

=

.

~

~

4

.o0

~

_

~

~

0

_

~

~

O

O

c

o


43/110

,

i

:

?

~

I

~

1

I

I

J

K

l

~

~

,

'

I

k

J

)

k

~

L

"

.

i

i

"

,

~

~

"

1

I

N

~

l

U

I

i

;

~

1

~

1

~

,

~

~

~

~

I

J

I

Y

:

,

~

1

'

[

1

I

~

~

"

~

,

~

~

"

I

'

i

~

.

.

.

.

.

.

~

,

,

'

÷

:

I

~

,

~

I

"

I

i

I

,

,

i

i

I

:

-

~

1

1

i

~

:

I

i

i

i

I

i

t

~

,

J

i

+

;

~

~

~

+

>

~

i

I

,

I

:

1

'

i

,i

K

~

s

o

•

C

p

t

m

e

Z

IIIi

:

F

i

i

i

1

i

I

I

i

,

~

~

i

~

,

[

I

'

I

1

1

l

[

I

I

1

1

I

1

1

1

~

1

I

1

r

~

d

I

I

V

i

~

~

d

'

1

1

1

I

I

I

i

~

I

l

i

1

1

H

1

1

I

I

1

1

i

1

I

]

1

1

I

1

1

1

"

I

1

'

~

t

1

1

L

I

1

1

1

1

I

1

1

'

I

~

1

l

L

'

i

1

L

1

5

[

~

~

~

I

1

I

~

1

'

1

>

l

J

I

L

I

L

'

I

1

1

i

~

I

1

1

i

1

1

1

1

)

~

~

I

F

1

1

1

g

1

1

I

I

1

1

1

~

I

1

L

1

I

~

I

L

i

I

L

1

~

L

1

1

1

1

;

I

I

L

L

[

~

g

~

L-12: Humble Cockrell Moran No. 124, 24-20S-26E, Lake Washington Field


44/110

i

c

-

O

N

°

~

E

2r

u

i

U

'

3

I

L

U

m

©

I

L

l

Z

©

N

o

-

I

J

v

~

E

O

-

c

-

O

°

~

(

D

-

~

>

c

-

@

o

r

,

L

/

3

~

,

.

~

o

i

n

-

t

~

c

,

~

o

o

t

O

c

O

c

o

o

o


45/110

F

~

"

I

g

I

-

~

[

J

:

1

,

~

~

,

+

~

I

,

~

i

u

K

m

-

.

¢

E

m

.

~

F

Z

I

1

II

i

I

~

1

1

I

i

I

L

1

,

I

~

i

I

~

~

i

~

i

i

I

~

~

~

,

'

r

[

1

I

I

I

II

1

1

I

I

[

~

:

1

/

1

J

~

~

I

Il

L

I

L

I

1

1

1

]

1

II

1

1

1

1

1

I

i

l

I

I

t

L

I

I

I

I

I

I

I

I

I

I

I

,

1

1

,

I

1

~

~

I

j

I

1

II

J

I

~

i

~

,

i

~

i

~

/

J

I

J

i

I

J

IL

i

~

i

I

~

,

'

,

,

I

4

I

I

i

I

;

.

I

l

r

'

I

I

l

i

~

I

i

,

,

1

1

~

%

i

[

~

1

I

~

i

~

i

I

L

i

i

i

M

A

N

B

G

N

f

o

d

~

N

c

~

:

E

I

pQ

I

f

]

L-13: State Lse. 798 No. A-5, Grand Isle Block 18 Field, 8500-8600 ft, Bige


46/110

I

7

©

N

o

¢

4

0

4

0

"

o

4

°

o

.

c

f

4

0(

1

Q

E

o

X

©r

,

4

0

o

,

~

o

¢

c

co

(

Y

-

0


47/110

iI

I

i

1

-

-

-

~

E

6

6

.

"

r

I

J

I

~

J

~

j

~

l

r

I

J

I

I

~

l

~

l

i

.

~

~

[

I

M

I

r

I

I

r

~

l

~

l

~

l

r

~

~

h

'

r

r

~

~

~

~

~

~

I

I

I

~

~

I

"

~

k

K

~

r

I

J

L

J

~

J

~

~

~

k

J

l

_

1

1

r

I

M

I

)

r

[

i

~

P

~

~

~

L

k

~

~

1

~

N

~

~

~

I

I

X

~

A

~

i

~

~

4

G

~

~

~

~

Y

F

~

I

I

~

"

T

•

•

T

r

•

[

I

N

1

I

•

L

•

•

•

J

J

J

•

l

i

'

¢

i

,

S

w

I

v

o

m

l

n

h

~

j

I

I

I

I

I

I

t

I

I

o

i

.

e

o

i

L

_

~

l

x

l

i

"

1

C

z

O

~

"

~

~

•

.

c

i

E

~

-

n

~

C

I

~

o

~

¢

L-14: Bullock No. 10 Wm. Hellis, 25-12S-18E, Little Bayou Field, 630


48/110

Z©

k

L

A

I

A

I

Z

L

©

co

e~-

Oe

o

u

o

p

.

4

VwOu

o

"

O

co

°

m

ocON

°

~

e

l

R

O

c

O

Oo

cO

o

o×oOo

e

q

~

"

o

>

°

°

~

r

o

r

o

.

E

O

O

Oo

o


49/110

q

I

u

II

L

1

[~

[

1

1

I

I

_

~

i

~

i

I

l

~

A

~

~

1

I

M

I

~

~

F

,

I

~

~

~

n

I

~

1

"

I

T

I

1

i

:

~

i

.

;

~

~

'

'

i

I

P

+

g

[

[

1

I

~

:

r

i

;

~

I

"

.

)

~

,

I

•

~

1

1

,

l

i

~

+

r

:

U

I

~

1

1

;

.

l

1

i

~

~

1

.

~

J

,

~

J

~

1

"

i

i

~

L

L

i

i

I

H

i

=

I

L

L

~

~

H

,

I

I

I

1

'

I

1

1

1

1

I

L

I

I

L

[

•

I

L

+

T

X

~

i

~

=

2

l

l

k

~

R

~

L

J

b

I

1

~

I

[

1

1

1

I

/

L

,

~

~

1

~

M

I

N

T

.

-

~

i

~

K

I

"

I

'

A

.

"

~

:

~

~

k

/

~

I

,

I

1

I

,

~

1

1

1

1

1

I

'

t

~

I

N

~

~

'

I

I

I

~

i

r

i

/

L

A

~

~

~

~

N

I

1

I

~

I

~

L

Z

~

~

l

~

~

r

g

L

I

L

L

T

r

F

[

1

1

I

1

1

1

I

T

F

I

I

1

1

I

l

/

I

:

E

o

m

B

R

A

C

K

$

H

F

=

Z

A

M

P

S

N

t

m

I

Z

o

¢

¢

~

L

l

D

L-15: Mobil No. 60 Cameron Meadows, 21-14S-13W, Cameron Meadows Field, 510


51/110

r

l

l

o

i

°

i

t

t

t

'

~

~

~

r

J

~

J

i

l

r

r

J

r

r

l

J

.

~

~

~

i

I

I

l

~

~

k

L

~

I

~

T

Y

I

i

'

1

r

~

~

~

L

~

"

H

.

L

~

I

,

;

I

~

•

~

l

~

r

r

F

~

=

I

i

r

j

I

i

i

i

i

J

r

I

i

J

J

r

d

i

i

~

'

~

I

J

i

~

I

i

J

d

r

i

[

~

I

d

r

i

I

1

i

i

I

H

t

r

E

l

-

~

Ii

P

i

n

m

R

l

u

J

E

N

S

Z

M

A

N

d

a

_

I

r

=

G¢

I

.

~

'

~

=

~

~

~

=

L-16: Superior Oil Miami Corp. B-8, 30-14S-3W, Pecan Lake Field, 12,400-12,5


52/110

FLUIDS

The loca t ion and id en t i f i ca t ion o f flu ids i s the o the r ma jo r use o f e le c t r i c a l logg ing .

S ince most ma t r ix ma te r ia ls a re no n-con duc t ive , i t i s the re s is t i v i t y o f the va r ious

f lu ids (f resh wate r , sa l t wa ter , and hydrocarbons) th at causes the major var ia t ion s o f

the res is t iv i ty curves. In ad di t io n, i t is the cont rast betwee n Rw and Rmf w hic h is the

ma jor cause of the SP. Figures 1 and 3 in the d iscussion of lo gg ing descr ibed the

va r ia t ion oF SP and res is t i v i t y o f a fo rmat ion w i th chang ing Rw .

Examp les F-3 th rough F- IO i l l us t ra te the e f fec t o f inc reas ing sa l in i t les . No te how

the amount o f SP measured stays h igh in the h igh er sa l in i ty format ions even though the

mud res is t iv i t ies a re low and the sands are qu i te sha ly.

Figure 4 in the logg ing d iscussion shows how R var ies w i th wa ter saturat ion. Examples

F-1 and F-2 show ve ry we l l how the res is t iv i ty o f the same sand changes as the sand

goes f rom wa te r bear ing dow nd ip to hyd rocarbon bear ing upd ip . No te tha t the l i t h o log y

of the sand remains constant as ind icated by the SP.


53/110

Z

.

N

Z

0

i

u

o

~

r

®

O

-

~

o

i

~

°

.

cq

.

_

•

z

-

~

0

3

e

-

~

"=

~

~

>

~

3

"

~

,

7

e

e

o

~

o

°

.

;

~

~

-

0

L

'

0

'

0

"

0

m


54/110

l

i

I

I

~

'

[

~

I

o

E

l

a

~

N

J

O

.

C

O

O

E

F-1: Tidewater, M.L.&.F. No. E-2, 22-21S-30E, Venice Field, 12,500-12,60


55/110

Z

0

J

mLI

%

u

u

"

o

e

;"

e

o

I

e

o

~D

(

3

>

u

"

3

.

~~

n

J

e

~

~

0

t

~


56/110

-

-

~

I

X

I

[

I

l

r

J

I

'

£

i

~

.

I

I

I

_

~

~

I

L

r

V

P

4

I

A

I

I

I

l

J

I

J

t

j

]

~

f

~

i

I

~

I

I

I

1

=

l

'

/

i

M

~

I

i

~

I

l

r

F

/

A

,

4

~

H

h

l

1

t

I

I

I

k

U

Z

'

~

I

~

,

-

Y

.

I

,

m

1

l

3

i

M

:

J

/

J

l

J

l

J

i

J

l

J

l

I

I

~

=

:

I

J

r

I

r

y

j

.

I

r

~

J

t

~

i

I

-

i

r

~

J

-

i

]

J

A

I

.

~

:

J

I

J

k

I

~

r

~

L

d

I

I

I

q

H

I

I

"

.

~

~

-

1

1

L

I

~

J

H

k

1

'

t

I

I

T

I

~

~

I

I

~

"

~

,

~

T

y

J

r

J

y

J

r

t

¢

U

J

~

1

I

t

,

,

,

"

]

J

/

r

r

J

[

~

t

~

;

,

~

,

I

<

r

[

r

r

r

r

1

i

-

~

~

1

¢

¢

-

L

I

~

,

i

,

=

I

_

J

r

J

L

<

k

S

I

r

I

J

~

H

Z

~

)

~

J

_

]

.

1

~

'

,

<

~

,

,

o

i

.

J

i

T

l

1

i

t

i

i

i

l

S

°

T

i

i

i

i

~

>

~

~

i

I

I

.

I

i

J

®

~

p

o

~

~

,

~

I

J

g

L

A

L

r

r

r

r

I

i

.

I

I

I

~

~

~

~

:

,

)

8

w

b

k

A

I

.

i

.

.

1

l

I

I

r

J

J

I

U

.

~

A

~

i

r

J

J

J

k

J

C

H

1

t

~

¢

1

"

~

]

h

J

I

J

J

'

:

1

h

r

~

r

1

~

1

~

I

J

L

J

l

J

J

J

I

F

I

r

1

Z

~

U

;

L

L

t

~

I

r

J

r

J

~

r

"

"

S

"

J

J

I

J

M

N

M

O

'

1

I

i

[

1

i

M

J

H

'

1

J

l

J

¢

U

I

~

J

W

i

T

~

I

J

L

_

~

~

~

2

-

E

o

~

a

~

s

~

.

J

S

%

I

C

p

m

l

v

o

m

I

u

Z

I

J

J

JK

~

~

"

~

~

r

I

L

F

~

t

1

~

~

~

P

f

J

I

V

W

I

J

1

,

~

~

V

J

J

J

J

,

~

~

q

k

~

l

J

.

I

I

Y

r

-

~

,

7

=

.

L

L

2

L

'

"

'

"

~

.

~

o

1

5

~

o

}

"

~

~

'

I

i

I

~

I

~

i

,

"

a

~

~

~

F-2: Tidewater, M.L.&.F. No. D-4, 22-21S-30E, Venice Field, 11,400-11,50


57/110

Z0

U

m

00

N

-

c

_

O

°

~

D

~

0

I

~

e

o

~

®

.

~

Z

e

~

.

o

~

~

O

oOo

O


58/110


59/110

I

2c

t

~

D

o

c

O

=

~

~

•

-

~

•

c

~

-~

~

~

~

0

'

-

D

0

"

~

o

~

0

J

'

r

_

-

~

"

~

o

(

~

_

~

c

~

-

~

~

o

~

o

~

0

X

e

~

e

C

c"

0

u


60/110

i

I

,

E

l

J

G

l

c

I

"

'

~

t

o

¢

N

f

F-4: Jim C. Shows No. 5, J.J. Martin, 28-9S-7E, No field listed, 600-700 ft


61/110

,

Z

m

N

-

C

>

.

0

~

.

0

c

_

c

.

-

o

~

.

6

.

.

4

-

-

-

O

0

o

~

Z

o

~

®

0

c

u

o

~

E

D

u

-

C

~

.

-

-

e

-

l

U

O

-

~

-

u

~

(

c

~

r

-

-

-


62/110

i

_

~

,

2

I

~

"

I

,

,

1

.

L

°

"

"

~

l

J

I

/

~

r

~

~

1

<

>

'

I

I

1

[~

I

~

l

I

~

I

L

l

~

J

4

I

~

k

~

i

"

k

~

T

I

L

,

i

I

I

~

i

.

.

.

.

.

.

.

.

.

.

.

l

l

~

~

.

.

.

.

.

.

.

.

.

.

.

.

i

i

~

I

:

~

~

~

~

]

_

~

:

~

I

I

,

i

I

~

I

'

r

I

i

I

H

I

I

~

~

,

~

~

4

4

J

r

~

l

e

i

+

i

,

~

~

-

"

i

I

~

"

i

;

'

I

g

m

a

I

"

~

1

r

~

m

e

i

I

Z

i

,

4

~

I

~

1

'

"

J

:

:

I

~

I

:

<

l

;

~

~

)

,

i

i

~

:

~

I

[

i

~

.

~

i

i

.

,

1

I

/

"

,

i

w

i

'

r

~

I

I

:

~

]

1

,

r

I

~

i

i

~

r

r

I

F

T

]

I

I

I

l

4

I

1

f

~

H

t

7

I

J

i

i

1

.

i

I

i

~

'

i

.

I

1

,

.

,

i

~

r

.

~

~

I

~

.

i

.

I

1

1

I

i

i

i

i

,

~

~

~

i

.

:

I

b

l

.

~

i

I

.

'

:

:

f

i

~

~

4

C

"

~

~

g

,

i

N

.

,

~

'

T

:

~

i

I

i

i

~

;

~

1

:

J

r

~

[

i

i

I

~

I

i

~

I

i

~

i

i

I

1

i

I

J

I

,

i

J

I

'

l

i

-

7

I

]

r

i

I

J

m

~

I

L

r

.

.

'

~

I

l

I

I

~

.

I

~

,

r

;

i

electric logs of south luisiana

Documents