Sedimentologic and diagenetic controls on reservoir development at Rosevear gas field, Swan Hills Formation (upper Devonian), central Alberta

Conference · Mon Feb 01 00:00:00 EST 1988 · AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)

OSTI ID:6085132

Kaufman, J; Hanson, G N; Meyers, W J

Carbonate strata at the Rosevear gas field consist of three major sedimentological packages: (1) basal platform, (2) platform reef, and (3) capping platform. Gas production is localized within two narrow trends of porous, massive, replacive dolostone occurring in the platform-reef sequence; tight limestones updip form the reservoir seal. Porosity trends are primarily restricted to the margins of a marine channel developed through the platform reef, but not the basal platform. Channel-margin strata consist mostly of dolomitized branching-stromatoporoid floatstones and rudstones. Massive replacive dolostone is composed of inclusion-rich coarsely crystalline nonferroan euhedral to anhedral rhombs that show a red cathodoluminescence. This dolomite has selectively replaced the limemud matrix; fossils were replaced to a much lesser extent. Fossils not dolomitized were selectively leached, resulting in well-developed biomoldic and vuggy porosity that forms the reservoir. Dolomitization occurred after cementation by clear, equant calcite and after early pressure solution. Secondary porosity in the dolostone trends was only partially reduced during later diagenesis, which consisted of, in order of decreasing age, precipitation of saddle dolomite, anhydrite, and coarsely crystalline calcite. Hydrocarbon migration occurred after the saddle dolomites, but before some late-stage calcite cement.

• Research Organization: State Univ. of New York, Stony Brook (USA)
• OSTI ID: 6085132
• Report Number(s): CONF-880301-
• Journal Information: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States), Vol. 72:2; Conference: Annual meeting of the American Association of Petroleum Geologists, Houston, TX, USA, 20 Mar 1988
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
ALBERTA
NATURAL GAS FIELDS
RESERVOIR ROCK
DIAGENESIS
CALCITE
CARBONATE ROCKS
DOLOMITE
FOSSILS
POROSITY
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CANADA
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
GEOLOGIC DEPOSITS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERAL RESOURCES
MINERALS
NATURAL GAS DEPOSITS
NORTH AMERICA
OXYGEN COMPOUNDS
RESOURCES
ROCKS
SEDIMENTARY ROCKS
020200* - Petroleum- Reserves
Geology
& Exploration