Diagenetic study of upper member of Smackover Formation (Upper Jurassic), Columbia County, Arkansas

Conference · Mon Sep 01 04:00:00 EDT 1986 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:6987882

Kalbacher, K F; Sartin, A A

Upper Smackover member reservoir quality trends in Columbia County, Arkansas, are the result of regional variations in the intensity of diagenesis. Major controls on diagenesis were marine-meteoric phreatic cementation and later stage brine dissolution and cementation associated with hydrocarbon maturation. Carbonate altered only by brine dissolution have higher porosity and permeability values than carbonates affected by marine-meteoric phreatic cementation. Cores from wildcat tests 1-Neill 23-8 and Pruet McMahen 25-12, Columbia County, Arkansas, were analyzed. The core from 1-Neill 23-8 was affected by late-stage dissolution and partial cementation by baroque dolomite, anhydrite, and poikilotopic calcite. The core from Pruet McMahen 25-12 was altered by marine-meteoric phreatic cementation, which effectively occluded pore space. Scanning electron microscope photomicrographs also reveal aragonitic needlelike structures in the core of the Pruet McMahen 25-12 core. These structures are believed to have been preserved as a consequence of early cementation, which occluded pore space and created a closed diagenetic system. Chemical analyses of both cores and the diagenetic overprints indicate brine development occurred nearer the location of the 1-Neill 23-8 wildcat test and migrated updip toward the site of the Pruet McMahen 25-12 wildcat test. Based on the results of this study, it is proposed that regional diagenetic control in the study area can be related to the mobility and location of the Louann Salt.

• Research Organization: Schlumberger Offshore Services, New Orleans, LA
• OSTI ID: 6987882
• Report Number(s): CONF-8610199-
• Conference Information: Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 70:9
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
ARKANSAS
BRINES
CARBONATE ROCKS
DIAGENESIS
DISSOLUTION
FEDERAL REGION VI
GEOLOGIC AGES
GEOLOGIC DEPOSITS
JURASSIC PERIOD
MESOZOIC ERA
MINERAL RESOURCES
NORTH AMERICA
PETROLEUM DEPOSITS
RESERVOIR ROCK
RESOURCES
ROCKS
SALT DEPOSITS
SEDIMENTARY ROCKS
USA