Identification and delineation of low resistivity, low permeability reservoirs using qualitative sidewall sample log k * S[sub O] relationships in the western shallow oil zone, Elk Hills Field, California

Conference · Mon Jan 01 00:00:00 EST 1996 · AAPG Bulletin

OSTI ID:6857314

Beacom, E K; Kornreich, I S ^[1]

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1. System Technology Associates, Inc., Golden, CO (United States)

Over 500 wells, including wells producing from the deeper Miocene Stevens sands, penetrate the Western Shallow Oil Zone (Pliocene Etchegoin Formation) at the Elk Hills Naval Petroleum Reserve in California. The Western Shallow Oil Zone Gusher and Calitroleum sands are very fine grained, silty and pyritic and are interbedded with silty shales. Electric logs generally show 1[1/2]-2[1/2] ohm-meters of deep resistivity and the spontaneous potential displays little or no response to the sands. However, approximately 180 wells in each of the mapped productive sands have sidewall sample data to visually inspect the rock for hydrocarbons. Each productive interval within the Western Shallow Oil Zone has two or more pools. The most exploited (and most heavily drilled) of these pools is at the western end of the Eastern anticline. The pools on the Western anticline have few tests and production is limited and generally commingled. In order to identify productive intervals and to delineate the areal extent of these sands, qualitative assessment of sidewall sample data was done and maps of log permeability times oil saturation were prepared for each zone. The analysis showed large amounts of unexploited hydrocarbons in the Western pools. Complete exploitation of the Gusher and Calitroleum sands will recover in excess of 11 million additional barrels of 38 degree gravity oil.

• OSTI ID: 6857314
• Report Number(s): CONF-960527-; CODEN: AABUD2
• Journal Information: AAPG Bulletin, Vol. 5; Conference: Annual convention of the American Association of Petroleum Geologists, Inc. and the Society for Sedimentary Geology: global exploration and geotechnology, San Diego, CA (United States), 19-22 May 1996; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
CALIFORNIA
OIL FIELDS
PETROLEUM
EXPLORATION
PRODUCTION
RESERVOIR ROCK
PERMEABILITY
RESISTIVITY SURVEYS
DEVELOPED COUNTRIES
ELECTRICAL SURVEYS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
MINERAL RESOURCES
NORTH AMERICA
PETROLEUM DEPOSITS
RESOURCES
USA
020300* - Petroleum- Drilling & Production
020200 - Petroleum- Reserves
Geology
& Exploration