Effects of depositional and diagenetic history upon the reservoir properties of Parkman Sandstone, Powder River basin, Wyoming

Conference · Tue Mar 01 04:00:00 EST 1983 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:6183533

Dogan, A U; Brenner, R L

The Parkman Formation in the study area is composed of four distinct units: (1) interbedded shale, siltstone, and very fine grained, well-sorted sandstone, which were deposited in prodeltaic environments; (2) coarsening-upward sequences of sandstone with lenticular siltstone beds and some shale interbeds, which were deposited in distributary mouth-delta front environments; (3) fine-grained, moderately sorted, horizontal to cross-bedded sandstones deposited in beach environments; and (4) dark lignitic shales, carbonaceous siltstones, and fining-upward sandstone sequences deposited in floodplain, swamp, and distributary channel environments. The timing and intensities of diagenetic alterations have profound effects upon reservoir properties of the Parkman Sandstone in the Wyoming part of the Powder River basin. The generalized diagenetic sequence can be summarized as follows: (1) ductile grain deformation and original porosity reduction due to settling and mechanical compaction; (2) authigenic chlorite formation as grain coatings or pore linings; (3) authigenic quartz overgrowths from dissolution of silica grains, and clay diagenesis, as well as pressure solution; (4) authigenic feldspar overgrowths; (5) minor authigenic mineral deformation due to continued mechanical compaction; (6) authigenic feldspar alterations to clay minerals; (7) calcite cementation; (8) dolomitization; (9) calcite replacment of siliciclastic grains; and (10) iron-oxide development. All of the authigenic minerals in the Parkman Sandstone, where they are abundant, reduce the effective primary porosity and permeability of potential reservoir sandstones prior to petroleum generation, migration, and accumulation.

• Research Organization: Univ. of Iowa, Iowa City
• OSTI ID: 6183533
• Report Number(s): CONF-8304200-
• Conference Information: Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 67:3
• 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
DEPOSITION
DIAGENESIS
FEDERAL REGION VIII
GEOLOGIC FORMATIONS
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
NORTH AMERICA
RESERVOIR ROCK
ROCKS
SANDSTONES
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
USA
WYOMING