Reservoir sedimentology of the Big Injun sandstone in Granny Creek field, West Virginia

Conference · Wed Jan 01 04:00:00 EST 1992 · Geological Society of America, Abstracts with Programs; (United States)

OSTI ID:5865627

Zou, Xiangdong; Donaldson, K; Donaldson, A C ^[1]

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1. West Virginia Univ., Morgantown, WV (United States)

Big Injun sandstones of Granny Creek oil field (WV) are interpreted as fluvial-deltaic deposits from core and geophysical log data. The reservoir consists of two distinctive lithologies throughout the field; fine-grained sandstones overlain by pebbly and coarse-grained sandstones. Lower fine-grained sandstones were deposited in westward prograding river-mouth bars, where distal, marine-dominant proximal, and fluvial-dominant proximal bar subfacies are recognized. Principal pay is marine-influenced proximal bar, where porosity ranges from 13 to 23% and permeability, up to 24 md. Thin marine transgressive shales and their laterally equivalent low-permeability sandstones bound time-rock sequences generally less than 10 meters thick. Where field mapped, width of prograding bar sequence is approximately 2.7 km (dip trend), measured from truncated eastern edge (pre-coarse-grained member erosional surface) to distal western margin. Dip-trending elongate lobes occur within marine-influenced proximal mouth-bar area, representing thickest part of tidally influenced preserved bar. Upper coarse-grained part of reservoir consists of pebbly sandstones of channel fill from bedload streams. Laterally persistent low permeability cemented interval in lower part commonly caps underlying pay zone and probably serves as seal to vertical oil migration. Southwest paleoflow trends based on thickness maps of unit portent emergence of West Virginia dome, which influences erosion patterns of pre-Greenbrier unconformity for this combination oil trap.

• OSTI ID: 5865627
• Report Number(s): CONF-921058--
• Conference Information: Journal Name: Geological Society of America, Abstracts with Programs; (United States) Journal Volume: 24:7
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
DEVELOPED COUNTRIES
DIMENSIONS
GEOLOGIC DEPOSITS
GEOLOGIC TRAPS
GEOLOGY
GEOPHYSICAL SURVEYS
LITHOLOGY
MINERAL RESOURCES
NORTH AMERICA
OIL FIELDS
PERMEABILITY
PETROLEUM DEPOSITS
PETROLOGY
POROSITY
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SEDIMENTATION
SURVEYS
THICKNESS
USA
WEST VIRGINIA