ABSTRACT: Reservoir Characterization by Multicomponent 3-D Seismic Imaging, South Casper Creek Field, Wyoming
Geological and reservoir engineering data coupled with multicomponent vertical seismic profile (VSP) and three-dimensional (3-D) seismic data have delineated faults, fractures, and facies within the Tensleep Sandstone reservoir at South Casper Creek field, Wyoming. Two dominant fault and fracture directions are present in the reservoir, one paralleling the northwest-trending anticlinal axis, the other cross-cutting the doubly plunging nose of the domal structure. These cross-cutting faults were active during the time of deposition of the Pennsylvanian eolian reservoir facies. Fault block movements along with cyclical relative sea level changes controlled sedimentation of the Tensleep reservoir facies. These same faults and fractures were a dominant influence on introducing a diageneti overprint to the reservoir. A phase of dissolution of dolomite cements from the reservoir by hydraulic fluid movement in the subsurface along fault and fracture zones was the main cause of porosity and permeability in the
reservoir. Multicomponent 3-D and VSP seismic data were used to image these porosity and permeability variations. Recent steam flooding of the reservoir confirms this characterization.
AAPG Search and Discovery Article #91017©1992 AAPG Rocky Mountain Section Meeting, Casper, Wyoming, September 13-16, 1992 (2009)