South Harmony Church field, Southwest Louisiana - Further insights on uppermost Wilcox shelf-margin trend
The uppermost Wilcox Group (Eocene) in the South Harmony Church field is a 2,000-ft thick sequence of single and multistory sandstones and shales. Cores of three separate intervals from four different wells display sedimentologic and lithologic features characteristic of inner shelf and shoreface deposition, representing an offshore bar complex. Typical lithofacies assemblages within an interval include, from top to bottom, (1) bioturbated, muddy sandstone--inner shelf, (2) less bioturbated, arenaceous sandstone--mostly inner shelf, (3) structureless to faintly horizontally laminated sandstone--mostly lower shoreface, and (4) horizontal to cross-laminated, and commonly deformed sandstone with shale and siltstone interbeds--lower surface. Sandstones are fine to very fine-grained, poorly to moderately well-sorted sublitharenites. Optimum reservoir quality is observed in the bioturbated, clean sandstones of the self-shoreface transition zone, where porosity ranges from 5 to 23% and permeability from less than 0.01 to 31 md. Porosity is mostly secondary and attributed to the leaching of labile constituents.
- OSTI ID:
- 6806023
- Report Number(s):
- CONF-880301-
- Resource Relation:
- Conference: Annual meeting of the American Association of Petroleum Geologists, Houston, TX, USA, 20 Mar 1988
- Country of Publication:
- United States
- Language:
- English
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