mississippian madison limestone, uinta mountains – outcrop ...river. note the cavernous nature of...
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UTAH GEOLOGICAL SURVEYDEPARTMENT OF NATURAL RESOURCES
L E A D V I L L E L I M E S T O N E R E S E R V O I RC H A R A C T E R I S T I C S
• Net pay – 27 to 225 ft (8-69 m)
• Depositional environments – shallow marine, subtidal, supratidal,intertidal, local buildups or mounds
• Carbonate fabrics - mudstone, wackestone, packstone,grainstone, boundstone (limestone and dolomite)
• Pore types – intercrystalline, moldic, vugs
• Porosity - averages 6-8%, enhanced by natural fracture systems
• Permeability – less than 1 md to 1100 md, averaging 22 md
• Solution breccia and karstified surfaces are common; localcavernous zones
M A D I S O N L I M E S T O N E O U T C R O P C H A R A C T E R I S T I C S
A
A – Location of Mississippian rock outcrops in Utah equivalent to the LeadvilleLimestone. B - Stratigraphic column of a portion of the Paleozoic sectionalong the south flank of the Uinta Mountains (modified from Hintze, 1993).
B
Wayne Co.
Garf ie ld Co.
Grand Co.
Navajo Co.Apache Co.
San Juan Co.
LaPlataCo.
Montezuma Co.
Dolores Co.
San Miguel Co.
Montrose Co.
Ouray Co.
MesaCo.
Emery Co.
COLORADONEW MEXICO
UTAHARIZONA
San Juan Co.
LisbonSoutheast
LittleValley
Lisbon
Big Indian
BigFlat
SaltWash
Cleft
Dry Mesa
UTAH COLO.
N.MEX.ARIZ.
Durango
Cortez
Rico
CrescentJunction
GreenRiver
Monticello
Moab
NUncompahgre uplift
0 20 mi
30 km0
Color
ado
River
River
Green
Paradox Basin
San Juan River
PA
RA
DO
X
FO
LD
A
ND
F
AU
LT
B
EL
T
700
600
400
500
600
700 500
200
400
500
700
300
200
0
300
300
Modified from Parkerand Roberts, 1963
Location of reservoirs that produce oil (green) and gas and condensate (red)from the Mississippian Leadville Limestone, Utah and Colorado. Thickness of
the Leadville is shown; contour interval is 100 ft (modified from Parker andRoberts, 1963). The Leadville Limestone play area is dotted.
Typical gamma ray-sonic log of the Leadville Limestone,Lisbon field discovery well, San Juan County, Utah.
Mississippian Deseret Limestone (Madison equivalent)forming a jagged, vertical cliff, North Fork of the Duchesne
River. Note the cavernous nature of the outcrop.
Typical Madison Limestone exposure of light to darkgray, medium bedded, fine to coarse crystalline,
limestone and dolomite containing fractures,stylolites, and crinoid hash, Whiterocks Canyon.
Vugs and fractures in limestone and dolomitic units,Whiterocks Canyon.
Close-up of open and calcite-filled vugs in limestonematrix, Whiterocks Canyon.
Close-up of small-scale, calcite-filled rectilinearfractures in limestone matrix, Whiterocks Canyon.
A combination of interbedded limestone anddolomite, containing fractures and zones of solution
breccia and vugs, results in a heterogeneousstratigraphic section, Dry Fork Canyon.
Possible small-scale carbonate buildup or mud mound(outcrop is approximately 10 ft [3 m] high), Dry Fork Canyon.
Mississippian Madison Limestone, Uinta Mountains – Outcrop Analogfor the Mississippian Leadville Limestone Reservoir, Paradox Basin
Mississippian Madison Limestone, Uinta Mountains – Outcrop Analogfor the Mississippian Leadville Limestone Reservoir, Paradox Basin