Skip to Main Content
Book Chapter

Stratigraphic and Combination Traps Within a Seismic Sequence Framework, Miocene Stevens Turbidites, Bakersfield Arch, California

By
James S. Hewlett
James S. Hewlett
Vastar Resources Inc. Houston, Texas U.S.A.
Search for other works by this author on:
Douglas W. Jordan
Douglas W. Jordan
ARCO International Oil and Gas Company Plano, Texas U.S.A.
Search for other works by this author on:
Published:
January 01, 1993

Abstract

The expression of stratigraphic and combination traps in upper Miocene Stevens turbidite sandstones of the Bakersfield arch, southern San Joaquin Valley, California, can be placed within a depositional sequence framework by integrating seismic, wireline-log, and core data. Insights from this study should reduce exploration risks in this mature basin and serve as exploration analogs in similar sand-rich turbidite systems globally.

Stevens sandstones occur as turbidites within the lowstand systems tracts of three depositional sequences (Coulter, Gosford, and Bellevue) that were deposited in a narrow, deep-water forearc basin. Regional marine-condensed sections containing siliceous shale and cherts separate the lowstand turbidite systems. Turbidites comprising the oldest (Coulter) system were transported by sediment gravity flows through distinct canyons on a sloping deep-water ramp, whereas the stratigraphically younger Gosford and Bellevue turbidite systems were deposited by gravity flows originating on high-relief deltaic slopes. The turbidite systems contain sandy, high-density (primarily) and low-density turbidite and debris-flow deposits in confined and unconfined complexes. Preexisting structural highs and depositional topography influenced the stacking geometries of the turbidite systems.

Four principal stratigraphic and combination stratigraphic/structural trap types in the Stevens turbidites are recognized: (1) permeability (facies) changes from proximal, thick, coarse-grained sandstones to distal, thin, fine-grained, interbedded sandstones and shales that occur on anticlinal flanks and account for the largest accumulations (up to 60 MMBOE); (2) channelized turbidite sandstones that pinch out against structural highs and contain reserves up to tens of MMBOE; (3) numerous small traps (<10 MMBOE) formed by compactional, low-relief, four-way structural closures; and (4) pinch-out of channelized, gully-fill turbidite sandstones within the less-explored middle and lower deltaic slopes of the Santa Margarita Formation.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables

Contents

AAPG Memoir

Siliciclastic Sequence Stratigraphy: Recent Developments and Applications

Paul Weimer
Paul Weimer
Search for other works by this author on:
Henry Posamentier
Henry Posamentier
Search for other works by this author on:
American Association of Petroleum Geologists
Volume
58
ISBN electronic:
9781629810997
Publication date:
January 01, 1993

GeoRef

References

Related

A comprehensive resource of eBooks for researchers in the Earth Sciences

This Feature Is Available To Subscribers Only

Sign In or Create an Account

This PDF is available to Subscribers Only

View Article Abstract & Purchase Options

For full access to this pdf, sign in to an existing account, or purchase an annual subscription.

Subscribe Now