csl geophysical log signature and sonic velocity

geophysical log signature and sonic velocity4

10 20 30 40 50 60 70

IW13 GR

0 10 20 30 40 50 60 70

IW14 GR

0 10 20 30 40 50 60 70

IW16 GR

0 10 20 30 40 50 60 70

IW15 GR

1000

1200

1400

1600

1800

2000

2200

2400

2600

1000

1200

1400

1600

1800

2000

2200

2400

2600

1000

1200

1400

1600

1800

2000

2200

2400

2600

1000

1200

1400

1600

1800

2000

2200

2400

2600

trans

gres

.re

gres

sive

max.flood

OldsmarFormation

Ia

Ib

IIa

IIb

IIIa

IIIb

SuwanneeLimestone

Mid

dle

Eoc

ene

- A

von

Par

k F

orm

atio

n

hiatus

hiatus

IVb

IVa

top Oldsmar Fm.

base Suwannee Fm.

~1000 ft (305 m)~1000 ft (305 m)~1000 ft (305 m)

gamma ray (cps) gamma ray (cps) gamma ray (cps) gamma ray (cps)

Very Low

Low

Medium

High

Very High

IW-13 FMS log Resistivity-Permeability ModelDepth (feet) G.R. Cycle

sequence boundary

1950

2000

2050

2100

2150

2200

2250

2300

2350

2400

2450

maximumflooding ?

subunita

subunitb

natural gamma ray

0 cps 100

regressive

transgressive

Gamma-Ray Log Model

Avon Park Fm.

gamma-raylog trend

more dolomite?

slower and/orintermittentdeposition?

finer-grainedlithofacies?

limestone?

relativelyrapid

deposition?

G.R. signature?

hiatal surface

University of Miami

CSL

0.000

500.0

1000

1500

2000

2500406080100120140160180

IW13 Sonic Velocity

Sonic velocity (usec/ft)

Suwannee Ls.

Oldsmar Fm.

HawthornGroup

trans

gres

.re

gres

sive

max.flood

Ia

Ib

IIa

IIb

IIIa

IIIb

Mid

dle

Eoc

ene

- A

von

Par

k F

orm

atio

n

IVb

IVa

1500

1600

1700

1800

1900

2000

2100

2200

23002000 6000 7000

Sunrise IW-3 Eocene Peritidal Facies Velocity

Dep

th i

n co

re (

feet

)

P-wave velocity (m/sec) at 10 MPa confining pressure3000 4000 5000

grainstonepackstonelaminated pkst/wackst"pond" mudstonemassive mudstonedense dolomite

Avon Park Formation

sequence boundary

resistivity, velocity & sonic porosity

gamma ray interpretation FormationMicroScanner

gamma-raylog profiles

andcorrelation,

southernstudy area

2000

2100

2200

2300

2400

00.10.20.30.40.50.6

IW13 Sonic Porosity

sonic porosity

Avon ParkFormation

IW-13FMS log

Depth (feet)

G.R.Cycle

dolomiteunit

1950

2000

2050

2100

2150

2200

2250

2300

2350

2400

2450

2000

2100

2200

2300

2400

0 10 20 30 40 50

IW13 Gamma Ray

gamma ray (cps)

sequence boundry

2000

2100

2200

2300

2400

0 0.5 1 1.5 2 2.5 3

IW13 LL3 Resistivity

resistivity (ohm-m)