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Title: South Belridge fields, Borderland basin, U. S. , San Joaquin Valley

South Belridge fields, Borderland basin, U. S. , San Joaquin Valley South Belridge is a giant field in the west San Joaquin Valley, Kern County. Cumulative field production is approximately 700 MMBO and 220 BCFG, with remaining recoverable reserves of approximately 500 MMBO. The daily production is nearly 180 MBO from over 6100 active wells. The focus of current field development and production is the shallow Tulare reservoir. Additional probable diatomite reserves have been conservatively estimated at 550 MMBO and 550 BCFG. South Belridge field has two principal reservoir horizons; the Mio-Pliocene Belridge diatomite of the upper Monterey Formation, and the overlying Plio-Pleistocene Tulare Formation. The field lies on the crest of a large southeast-plunging anticline, sub-parallel to the nearby San Andreas fault system. The reservoir trap in both the Tulare and diatomite reservoir horizons is a combination of structure, stratigraphic factors, and tar seals; the presumed source for the oil is the deeper Monterey Formation. The diatomite reservoir produces light oil (20-32{degree} API gravity) form deep-marine diatomite and diatomaceous shales with extremely high porosity (average 60%) and low permeability (average 1 md). In contrast, the shallow ({lt}1000 ft (305 m) deep) overlying Tulare reservoir produces heavy oil (13-14{degree} API gravity) from unconsolidated, arkosic, fluviodeltaic sands of high porosity (average 35%) more » and permeability (average 3000 md). The depositional model is that of a generally prograding fluviodeltaic system sourced in the nearby basin-margin highlands. More than 6000 closely spaced, shallow wells are the key to steamflood production from hundreds of layered and laterally discontinuous reservoir sands which create laterally and vertically discontinuous reservoir flow units. « less
Authors: ;
Publication Date:
OSTI Identifier:7079258
Report Number(s):CONF-910403--
Journal ID: ISSN 0149-1423; CODEN: AABUD
Resource Type:Conference
Resource Relation:Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States); Journal Volume: 75:3; Conference: Annual meeting of the American Association of Petroleum Geologists (AAPG), Dallas, TX (United States), 7-10 Apr 1991
Country of Publication:United States
Language:English
Subject: 02 PETROLEUM; 03 NATURAL GAS; CALIFORNIA; NATURAL GAS DEPOSITS; PETROLEUM DEPOSITS; PETROLEUM GEOLOGY; ANTICLINES; GEOLOGIC FORMATIONS; GEOLOGIC TRAPS; POROSITY; PRODUCTION; RESERVES; RESERVOIR ROCK; SEDIMENTARY BASINS; TERTIARY PERIOD; CENOZOIC ERA; DEVELOPED COUNTRIES; GEOLOGIC AGES; GEOLOGIC DEPOSITS; GEOLOGIC STRUCTURES; GEOLOGY; MINERAL RESOURCES; NORTH AMERICA; RESOURCES; USA 020200* -- Petroleum-- Reserves, Geology, & Exploration; 030200 -- Natural Gas-- Reserves, Geology, & Exploration