Depositional environment and reservoir characteristics of an upper Devonian sandstone in the Appalachian basin, Cherryhill field, Indiana County, west-central Pennsylvania

Conference · Sun Apr 01 04:00:00 EST 1984 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:6570529

Greenawalt, J C

An isopach map, cross sections, genetic increment strata (GIS) map, core studies, and subsurface well logs suggest a gas-productive turbidite channel deposit for the Upper Devonian Speechley sandstone in Cherryhill field in west-central Pennsylvania. Isopaching indicates the channel trend, showing the geometry of the sand body perpendicular to basin contouring. Cross sections document a downcutting erosional contact with the underlying marine shales. Using a lithologic time correlator above the sand and the erosional basal contact, a GIS map shows that maximum reservoir development coincides with the central channel axis. Thus, the iospach and GIS maps are essentially identical; both confirm the channel trend. Bedding characteristics, sedimentary structures, and petrology, from 59 ft (18 m) of conventional core, also suggest a turbidite channel. Bedding is predominately massive, and is comprised of incomplete Bouma sequences. Grain size decreases upward. Porosities which average 8%, and permeabilities, which are generally less than 1 md, were reduced by silica and carbonate cements and clays bridging pore throats. Sedimentary structures include shale clasts, erosional basal contacts, and bioturbation. The combination of various mapping techniques and core interpretation suggest a turbidite channel origin for the Speechley sandstone. This approach may permit predictions for field development and exploratory drilling.

• Research Organization: Delta Drilling Co., Pittsburg, PA
• OSTI ID: 6570529
• Report Number(s): CONF-8405216-
• Conference Information: Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 68:4
• 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
FEDERAL REGION III
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
GEOLOGY
MAPS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NATURAL GAS FIELDS
NORTH AMERICA
OIL FIELDS
PENNSYLVANIA
PETROLEUM DEPOSITS
RESERVOIR ROCK
RESOURCES
STRATIGRAPHY
USA