Depositional systems and reservoir quality of Clinton sandstone, Guernsey County, Ohio

Conference · Thu May 01 04:00:00 EDT 1986 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:5162003

Keltch, B

The Lower Silurian Clinton sandstone is the best producer of gas and oil in eastern Ohio. Successful exploration for its subtle stratigraphic traps requires detailed knowledge of its depositional systems, which were defined by sandstone thickness maps, gamma-ray log cross sections covering a 25-mi area, log signatures, and four slice thickness maps. Two cores and some thin sections helped substantiate environmental interpretations based on logs. These deltaic deposits produce from multistory and laterally discontinuous distributary mouth bars, distributary channels, and delta-plain point bars that are predictably interrelated, each having a unique isopach pattern, log signature, and production characteristics. Distributary mouth-bar reservoirs occur in more than 70% of the wells. They have coarsening-upward log signatures and elongate isopach patterns, and are 0-22 ft thick. They also exhibit poor production, with median payout times exceeding 5 years. Distributary channel-fill reservoirs are superimposed on underlying mouth-bar deposits. They have blocky log signatures and form linear, narrow shoestrings. These reservoirs are found in 18% of the wells, and more than 70% of the wells reach payout in less than 2 years. Meander point-bar reservoirs are the best economically but are encountered in only 8% of the wells. These fining-upward, ovoid to kidney-shaped reservoirs are prolific gas producers and range up to 25 ft thick. Isopach maps define and project the extent of distributary channels, but point bars, because they are thin, are not apparent and must be identified by cross sections, log signatures, and stratigraphic position.

• Research Organization: Consolidated Resources of America, Inc., Houston, TX
• OSTI ID: 5162003
• Report Number(s): CONF-860624-
• Conference Information: Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 70:5
• 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
EXPLORATION
FEDERAL REGION V
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC TRAPS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NORTH AMERICA
OHIO
PETROLEUM DEPOSITS
RESERVOIR ROCK
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
USA