Hydrocarbon potential of lower Duperow Formation as cored in Hill and Chouteau Counties, central Montana

Conference · Fri Jul 01 04:00:00 EDT 1988 · AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)

OSTI ID:6179934

Robertson, G C; Bereskin, S R

A paleotopographic ridge existed in north-central Montana during southward transgression of Souris River (Giventian) and lower Duperow (Frasnian) seas. This ridge represented a southeasterly extension of Canadian Alberta Ridge, which served as a locus for reef development in western Alberta during the Devonian. Located on the back-reef shelf between the Cordilleran barrier reef and the intracratonic Williston basin, this ridge formed a regional high favorable to patch-reef development, much like the Alberta Ridge did for more extensive reef complexes in western Canada. Extensive coring of lower Duperow and Souris River carbonates in four wells detailed several depositional facies and demonstrated wide-spread distribution of stromatoporoidal buildups up to 20 ft in individual thickness. Faunal assemblages indicate mostly normal marine conditions and potential for patch-reef development. Equally attractive reservoir facies comprised of cross-bedded detrital dolomite bars and/or channels, leached soil horizons, and bedded anhydrite-laminated carbonate sabkha facies were encountered in cored intervals. These reservoir facies reflect lateral stratigraphic variations in otherwise regionally extensive cyclic sequences. Each regional cycle is terminated by an anhydritic phase reflecting separate pulses in the overall transgressive advance of the Devonian seas. The capping anhydrite and lateral facies variation within each cycle provide numerous opportunities for stratigraphic traps. Residual oil extracted from cored samples correlates well with Williston basin Red River-type oil. Source rock evaluation of Souris River carbonates coupled with diagenetic evidence of early oil migration into lower Duperow and Souris River reservoir facies indicate a favorable thermal history for oil preservation.

• Research Organization: Louisiana Land and Exploration Co., Denver, CO (USA)
• OSTI ID: 6179934
• Report Number(s): CONF-8808223-
• Conference Information: Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States) Journal Volume: 72:7
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
DOLOMITE
EXPLORATION
FEDERAL REGION VIII
FOSSILS
GEOLOGIC DEPOSITS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERAL RESOURCES
MINERALS
MONTANA
NATURAL GAS DEPOSITS
NORTH AMERICA
OXYGEN COMPOUNDS
PETROLEUM DEPOSITS
RESERVOIR ROCK
RESOURCES
SOURCE ROCKS
USA