--> ABSTRACT: High-Resolution Sequence Stratigraphic Approach to Carbonate Reservoir Characterization for Understanding Flow Units and Petrophysical Properties; Example from Permian North Cowden Field, West Texas, by Robert G. Loucks, David Entzminger, and Shinichi Sakurai; #90906(2001)
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Robert G. Loucks1, David Entzminger2, Shinichi Sakurai1

(1) Bureau of Economic Geology, UT at Austin, Austin, TX
(2) BP, Houston, TX

ABSTRACT: High-Resolution Sequence Stratigraphic Approach to Carbonate Previous HitReservoirNext Hit Previous HitCharacterizationNext Hit for Understanding Previous HitFlowNext Hit Previous HitUnitsNext Hit and Petrophysical Properties; Example from Permian North Cowden Field, West Texas

Depositional and diagenetic processes at the scale of high-resolution sequence stratigraphy (parasequence level) have the strongest effect on carbonate-Previous HitreservoirNext Hit Previous HitflowNext Hit Previous HitunitsNext Hit and their petrophysical properties. The layering of the Previous HitreservoirNext Hit should therefore be done at a scale that reflects high-frequency cycles or parasequences. At this level, Previous HitflowNext Hit Previous HitunitsNext Hit and petrophysical properties become meaningful to Previous HitreservoirNext Hit modeling.

This concept can be illustrated by examining the hierarchy of factors that control Previous HitreservoirNext Hit dimensions and petrophysical properties. Regional depositional setting is the basis for understanding general, large-scale facies distribution, but it is not fine-scaled enough to explain or predict Previous HitflowNext Hit-unit properties. It is at the scale of high-resolution, sequence stratigraphic systems tracts analysis that effects of depositional environment and resulting texture and fabric are made clear. Depositional environment generally controls dimensions of a Previous HitreservoirNext Hit, and texture/fabric controls petrophysical properties.

The Upper Clear Fork through Lower San Andres section in North Cowden field shows a strong correlation between parasequence-level stratigraphy and resulting Previous HitreservoirNext Hit continuity, pore types, porosity, permeability, and capillary pressure. Parasequences deposited during different stands of relative sea level show consistent, but not necessarily homogeneous, petrophysical properties. The boundaries of the Previous HitflowNext Hit Previous HitunitsNext Hit generally match parasequence boundaries except where a parasequence boundary and a sequence boundary coincide. The most meaningful approach to picking Previous HitflowNext Hit Previous HitunitsNext Hit in this carbonate Previous HitreservoirNext Hit is first to construct the high-resolution sequence stratigraphic architecture of the Previous HitreservoirTop and then to relate the petrophysical parameters to this architectural framework.

AAPG Search and Discovery Article #90906©2001 AAPG Annual Convention, Denver, Colorado