A reservoir characterization study of the lower Grayburg and upper San Andres reservoir is provided as a case history that integrates petrophysical and seismic attribute analyses for seismic guided mapping of effective porosity. The study involves a petrophysical evaluation of the reservoir at approximately thirty well locations and the interpretation of a nine square mile area of 3-D seismic data The project is conducted using a network of state-of-the-art geological, geophysical, and engineering analysis software running on high performance UNIX computer workstations. Specific pore types are defined within the reservoir interval based on pore connectivity and lithology. The petrophysical results are loaded into reservoir modeling software for integration of results with seismic attributes to produce seismic guided reservoir maps. Later these maps are available to export reservoir properties to populate a finite difference reservoir simulation grid.The main objective of this study is to determine new drill locations corresponding to favorable net effective porosity and to develop a completion methodology to delineate productive zones. It is equally important to identify waterproducing zones so as to avoid those intervals.The project is organized into the following sub-tasks to evaluate the reservoir architecture of the Grayburg and San Andres reservoir:1.) Development of computer algorithms toclassify pore types from modern wireline logsuites.2.) Map distribution of porosity types andhydrocarbon saturations using well controlhorizontally and vertically through the reservoir.3.) Determine 3-D seismic attributes that canbe correlated with the mapped reservoirproperties.4.) Seismic guided mapping of averageeffective porosity and other reservoir propertiesin the interwell region.5.) Evaluate current completion techniques andidentify workover potential.6.) Recommend new drill locations andadditional oil productive zones in the reservoir.
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