--> ABSTRACT: Structural and Stratigraphic Compartmentalization of the Terry Sandstone, and Effects on Reservoir Fluid Distributions, Latham Bar Trend, Denver Basin, CO, by Muatasam H. Al-Raisi, Roger M. Slatt, Michael K. Decker; #91020 (1995).
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Structural and Stratigraphic Compartmentalization of the Terry Sandstone, and Effects on Reservoir Fluid Distributions, Latham Bar Trend, Denver Basin, CO

Muatasam H. Al-Raisi, Roger M. Slatt, Michael K. Previous HitDeckerTop

Latham Bar Trend, Denver Basin, Colorado, is a 6 mile (9.6 km) long by 1-2 mile (1.6-3.2 km) wide, oil-productive sandstone. Based on core analyses, four main sedimentary facies occur: cross-bedded sandstone, burrowed muddy sandstone, interlaminated sandstone/mudstone, and muddy siltstone. Permeability is directly related to facies, with the cross-bedded sandstone exhibiting the highest mean value (3.2 md). Also, the presence of diagenetic clays and sericitized lithic grains reduces well log resistivity, so there may be missed lower-resistivity pay.

Correlation of 210 well logs indicates the Trend is dissected by a series of northeast-trending faults with vertical displacements of 30-100 ft (9-30 m). They are interpreted to be sealing on the basis of: (1) normalized GOR values from different wells systematically increase up-structure within individual fault blocks; (2) initial potential API gravity values from different wells show systematic groupings within individual fault blocks; (3) EUR values within each fault block exhibit a positive correlation with thickness of cross-bedded sandstone; (4) individual wells with specific normalized GOR values occur at different structural elevations in adjacent fault blocks, giving rise to structural reversal of fluid distributions.

These criteria have been successfully applied to identify reservoir compartments in Latham Bar Trend, and to better understand causes of complex reservoir fluid distributions. The criteria have the potential to be applied to other petroleum reservoir settings.

AAPG Search and Discovery Article #91020©1995 AAPG Annual Convention, Houston, Texas, May 5-8, 1995