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The Point Arguello Field: Giant Reserves in a Fractured Reservoir, California

By
William E. Mero
William E. Mero
Chevron Overseas Petroleum, Inc. San Ramon, California, U.S.A.
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Stephen P. Thurston
Stephen P. Thurston
Chevron USA New Orleans, Louisiana, U.S.A.
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Robert E. Kropschot
Robert E. Kropschot
Chevron Corp. San Francisco, California, U.S.A.
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Published:
January 01, 1992

Abstract

Chevron (as operator for its partners, Phillips, Union Pacific Resources, and Impkemix) discovered the Point Arguello oil field in 1981. The discovery well, the Chevron et al. Ρ 0316 #1, was drilled in federal waters 8.5 mi (13.7 km) south of Point Arguello, California. Delineation drilling (by both Chevron and Texaco) has confirmed the discovery of a giant oil field with estimated recoverable reserves in excess of 300 million bbl of oil.

The oil field is located within a small depocenter at the southern edge of the offshore Santa Maria basin. This local depocenter may contain over 15,000 ft (4600 m) of Neogene rocks. The Point Arguello accumulation is trapped in a large north-northwest-trending anticlinal complex and is part of an anticlinal trend of similar Monterey oil discoveries and producing fields within the offshore Santa Maria basin.

The primary reservoir is the middle and upper Miocene Monterey Formation, composed of fractured cherts, porcelanites, siliceous mudstones, and dolostones. Calculated fracture permeabilities range up to 3 darcys. Crestal wells have productive capabilities, after acid, of approximately 6000 BOPD.

Three production platforms have been installed, and connected by oil and gas pipelines to onshore treatment facilities capable of handling 100,000 BOPD and 60 MMCFGD. Thirty-nine development wells have been drilled. Initial production was scheduled for late 1987; however, permitting delays stalled production from this giant oil field until May 1991.

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Contents

AAPG Memoir

Giant Oil and Gas Fields of the Decade 1978-1988

Michel T. Halbouty
Michel T. Halbouty
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American Association of Petroleum Geologists
Volume
54
ISBN electronic:
9781629811086
Publication date:
January 01, 1992

GeoRef

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