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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
1Petroleum Consultant, 1511 18th Avenue East, Seattle, Washington 98112; e-mail: [email protected]
2Geologist, Illinois State Geological Survey, Natural Resources Building, 615 East Peabody Drive, Champaign, Illinois 61820-6964.
ABSTRACT
trap
along the upthrown side of a major normal
fault
trend. Although the principal reservoir zone, the Waltersburg Sandstone, is mostly
depleted, another important interval, the Aux Vases Sandstone, appears underexploited in
many parts of the field. Description and analysis of the only continuous core through the
Aux Vases has led to the identification of major lithofacies and their characterization in
terms of reservoir quality. The Aux Vases appears to represent a series of shallow marine
bars separated by nonreservoir areas of siltstone, shale, and shaly sandstone. Log-based
mapping of reservoir distribution, plus production and pressure data, indicates
significant lateral and vertical compartmentalization of the reservoir. Although
insufficient data exist for full-scale integrated reservoir characterization studies, a
trend surface analysis was performed on structural information across the field. The
results of this analysis were compared with reservoir distribution maps to identify areas
for future drilling or recompletion.
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