CHHIBBER, RAVI, GeoQuest, Houston, TX

Abstract: Accurate Reservoir Volumes Using 3D Geological Modeling, Seismic Attributes and a Workflow Approach

This poster depicts the workflow approach that was developed to generate accurate reservoir volumes for a complex geological setting in the West Cameron block in Gulf of Mexico. The gas bearing sand has been divided into four blocks bounded by faults and has been confirmed by drilling in two blocks. The approach leverages an integrated software environment for consistent interpretation using seismic and log data. Seismic to well ties was an important element in the process. Next, the seismic data and interpretation (faults and horizons) are converted to depth and corrected to marker interpretation. A fault framework is then built by using the fault planes and generating the fault termination hierarchy. This framework is then used with the seismic horizon and well marker interpretation to generate the 3D structural model.

The approach analyzes the indications on the seismic attributes and validates them with log data. Several seismic attributes are analyzed and finally two attributes are chosen to estimate the log property from the seismic. Next, the geostatistical methods are leveraged to populate the framework using the estimated properties and the available log data.

Subsequently, the sand object is defined using the voxel technology with depth converted seismic data. This sand object is then selectively populated using the best suited geostatistical technique. The approach was carefully designed to allow multiple scenario testing to optimize sand object definition. High quality volumetric results were obtained by testing several hypotheses.

This optimized workflow allowed leveraging the available tools to get the optimal results. 

AAPG Search and Discovery Article #90924©1999 GCAGS Annual Meeting Lafayette, Louisiana