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Lithofacies, Depositional Environments and Reservoir Quality of Pliocene Deep-Sea Fan Sediments, Inglewood Field, Los Angeles Basin, California

By
W. J. Schweller
W. J. Schweller
Chevron Oil Field Research Company 1300 Beach Blvd., P. O. Box 446 La Habra, California 90631
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J. Gidman
J. Gidman
Chevron Oil Field Research Company 1300 Beach Blvd., P. O. Box 446 La Habra, California 90631
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C. W. Grant
C. W. Grant
Chevron Oil Field Research Company 1300 Beach Blvd., P. O. Box 446 La Habra, California 90631
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A. A. Reed
A. A. Reed
Chevron Oil Field Research Company 1300 Beach Blvd., P. O. Box 446 La Habra, California 90631
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Published:
January 01, 1988

Abstract

A 1400-ft continuous core from the Inglewood Field in the Los Angeles Basin consists of poorly consolidated sandstones and mudstones that represent deposition in the middle to outer parts of a deep-sea fan. Biostratigraphy indicates that the basin floor remained at lower bathyal depths (>2000 m or 6500 ft) throughout deposition of the cored interval. Both shallow and deep-water microfossils are present in all samples, implying downslope transport of shallow-water fauna to deeper depths as is typical for turbidites.

The core contains several hundred alternating sandstone and mudstone beds that range from less than 0.1 to over 16 ft thick. The sandstones are arkosic arenites, lithic arenites, and arkosic wackes. The thinner sandstones are well sorted and cross-bedded, whereas the thicker sandstones are poorly sorted and massive. Variations in bed thickness, internal character, and sandstone percentage were used to define five lithofacies; these range from massive mudstone to massive sandstone with three intermediate, interbedded sandstone and mudstone facies. The five lithofacies represent laterally continuous subenvironments across depositional lobes of a deep-sea fan system. Vertical sequences show alternating thickening- and thinning-upward cycles that suggest gradual lateral shifting of the depositional lobes across the basin floor.

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Contents

SEPM Core Workshop Notes

Giant Oil and Gas Fields: A Core Workshop

Anthony J. Lomando
Anthony J. Lomando
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Paul M. Harris
Paul M. Harris
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SEPM Society for Sedimentary Geology
Volume
12
ISBN electronic:
9781565761001
Publication date:
January 01, 1988

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