Paragenesis and reservoir quality within a shallow combination trap: Central West Virginia

Journal Article · Tue Nov 30 23:00:00 EST 1993 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:5539396

Bell, D A ^[1]; Siegrist, Jr, H G ^[2]; Buurman, J D ^[3]

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1. Environmental Protection Agency, Atlanta, GA (United States)
2. Water Energy Research Inst. of Western Pacific, Mangilao (Guam)
3. Columbia Natural Resources, Inc., Charleston, WV (United States)

Sandstone character and reservoir quality of the Lower Mississippian Pocono Big Injun sandstone were examined in Granny Creek-Stockly field, Clay County, West Virginia. Sixty-three samples from 6 wells were analyzed using transmitted light, x-ray diffraction, and scanning electron microscopy techniques. The Pocono Big Injun formation is divided into four [open quotes]sands[close quotes] (Injun 1 through 4) based on composition and hydrocarbon productivity. The Injun 1 sand is a fine-grained, carbonate-cemented litharenite below the oil-producing zone. The oil-productive Injun 2 and 3 sands are well sorted, fine-grained litharenites which contain more authigenic and allogenic clay minerals than adjacent sands. These sands have produced more than 3.4 million bbl of oil from the Granny Creek part of the field since 1925. The Injun 4 sand is generally a coarse-grained sublitharenite with marginal gas production limited to the uppermost section of the sand. The paragenetic sequence consists of (1) minor quartz overgrowths, (2) illite and chlorite grain coatings, (3) quartz overgrowths, (4) early carbonate, (5) kaolinite, (6) calcite, (7) dolomite, and (8) pyrite. Porosity and permeability were not preserved once paragenesis progressed past the kaolinite stage. Porosity and permeability are variably preserved when steps in the paragenetic sequence are absent within the Pocono Group. Where any porosity is identified within the Pocono sandstones, primary porosity is dominant. However, secondary porosity and microporosity in clay-rich intervals are also important.

• OSTI ID: 5539396
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (United States), Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Vol. 77:12; ISSN 0149-1423; ISSN AABUD2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
COHERENT SCATTERING
DEVELOPED COUNTRIES
DIFFRACTION
ELECTRON MICROSCOPY
EXPLORATION
GEOLOGIC DEPOSITS
GEOLOGY
MICROSCOPY
MINERAL RESOURCES
NORTH AMERICA
PARAGENESIS
PETROLEUM DEPOSITS
PETROLEUM GEOLOGY
POROSITY
RESOURCES
ROCKS
SANDSTONES
SCANNING ELECTRON MICROSCOPY
SCATTERING
SEDIMENTARY ROCKS
STRATIGRAPHY
USA
WEST VIRGINIA
X-RAY DIFFRACTION