Stratigraphic framework construction builds off the facies description and depositional modeling, and has a primary impact on all other aspects of reservoir characterization because the gridded stratigraphic framework constrains all 3-D property distributions. One interesting finding at SSAU is evidence of dissolution in core material that was collected post-CO2 flood. The principal reservoir facies are fusulinid dolowackstone, fusulinid-peloid dolopackstone, and coated-grain dolograinstone. Depositional facies control the reservoir properties with the exception of pore-plugging by late anhydrite. The core facies description work was key to developing a depositional model, and helped calibrate well log responses.
The depositional model and stratigraphic framework tasks provides a basis for constraining the eventual geomodel framework, as well as both geophysics and petrophysics modeling tasks. The major geomodel workflow tasks are presented in order as follows:
The input data set for integration into this full-field model consisted of 12,000 ft of core, 630 well logs, 3D seismic, and 40+ years' production history. This presentation illustrates the reservoir characterization steps used in the creation of the full-field geomodel that was initially validated using quality-control checks in the geomodeling workflow. Recently a full-field reservoir characterization 3D geomodel was constructed both for input to ongoing reservoir simulation efforts, and as a tool for integrated reservoir management decisions. The West Texas Seminole San Andres Unit (SSAU) is a mature CO2 flood and one of the ten largest fields in the Permian Basin, with 615 MMBO cumulative production. Zahm3, Chris Zahm4, and Don H Caldwell5 -, Littleton, CO 2Amerada Hess Corporation, Houston, TX 3Bureau of Economic Geology, Houston ,TX 4ConocoPhillips Corp., Houston,TX.
Wingate2, Jim Bush2, Ken Kosco2, Michelle Simon2, Scott Pluim2, Becky Tupman2, Laura C. Presentation for CEED CO2 Forum, Midland, Texas, December 12, 2003Ĭonstruction and Validation of an Integrated 3D Reservoir Characterization Geomodel for Reservoir Management at Seminole San Andres Unit
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