Reservoir geology of upper Mississippian St. Louis Limestone, South Mouser field, Texas County, Oklahoma

Conference · Sat Aug 01 04:00:00 EDT 1987 · AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)

OSTI ID:5907282

Caldwell, C D; Vick, III, H O

Five porosity zones in the upper 80 ft (24.4 m) of the St. Louis Limestone have a cumulative production of over 1 million bbl of oil since St. Louis production was discovered at South Mouser field, Texas County, Oklahoma, in April 1983. Porosity in the cored St. Louis Limestone includes primary intergranular, leached grain, and minor vuggy, intragranular, and fracture. Within the five porosity zones, core porosity generally ranges from 6 to 14% and permeability from 1 to 100 md. Porosity development and cementation reflect, for the most part, meteoric diagenesis. Deposition and diagenesis of the upper 100 + ft (30.5 + m) of the St. Louis Limestone were markedly influenced by a local St. Louis paleohigh in approximately the same location as the present structural high at South Mouser field. Cementation, compaction, and a significant amount of ineffective moldic porosity in the cored interval of the St. Louis Limestone result in increased pore system tortuosity. This indicates that an m value greater than 2.0 may be appropriate in S/sub W/ calculations. Additionally, in one porosity zone, ooids contain microporosity visible in SEM study. This porosity may hold irreducible water affecting S/sub W/ calculations made from wireline logs and resulting in an inaccurate assessment of the zone's ability to produce hydrocarbons. Two distinct oil-water contacts occur in the upper St. Louis Limestone at South Mouser. The corresponding reservoirs are separated by a low porosity and permeability layer seen in core and correlated across the field using neutron-density logs.

• Research Organization: Cities Service Oil and Gas Corp., Tulsa, OK
• OSTI ID: 5907282
• Report Number(s): CONF-870916-
• Conference Information: Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States) Journal Volume: 71:8
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
CARBONATE ROCKS
DIAGENESIS
FEDERAL REGION VI
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGY
LIMESTONE
MINERAL RESOURCES
MISSISSIPPIAN PERIOD
NORTH AMERICA
OIL FIELDS
OKLAHOMA
PALEOZOIC ERA
PETROLEUM DEPOSITS
POROSITY
RESERVOIR ROCK
RESOURCES
ROCKS
SEDIMENTARY ROCKS
USA