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Ahead of Print Abstract
AAPG Bulletin, Preliminary version published online
Copyright © 2023. The American Association of Petroleum Geologists. All rights reserved.
Complex multi-scale reservoir heterogeneity in a tidal depositional environment, Temblor Formation, West Coalinga Field, California
1 University of California Riverside
2 Chevron North America, Houston, TX
3 Chevron North America San Joaquin Valley Business Unit, Bakersfield, CA
4 Chevron Gulf of Mexico Business Unit, Houston, TX
Ahead of Print Abstract
As described in parts 2 and 3, incised valley fills, associated with Lowstand Systems Tract (LST) deposition above sequence boundaries, represent the dimensionally largest stratigraphic heterogeneities, are excellent completion targets, and can be imaged in 3D seismic data as well as recognized in well sections. Incised valley fills typically consist of multi-story tidal-channel complex deposits. Mudstone intervals, locally diatomaceous, represent Transgressive Systems Tract (TST) deposits, and form vertical compartments in the reservoir. Highstand Systems Tract (HST) deposits include tidal bar and tidal channel deposits. Odd wedge-shaped bodies at a scale similar to incised valleys are also present in the upper Temblor reservoirs, and represent deposition by back-stepping (TST) and prograding (HST) systems tracts.
At the bedset scale, thin mudstone beds, mudstone drapes and mudstone clast conglomerates represent finer scales of heterogeneity. Localized carbonate cemented zones can be mapped and represent important diagenetic heterogeneities that locally reduce net pay at the facies level. These well-documented different heterogeneity types can be used to address potential concerns in other tidal reservoirs being considered for development or in the early stages of production.
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