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Kexian Yang1, SomchaiI Sriisraporn2, Nutthawut Chuemthaisong2, Kanit Sangwongwanich2, Jeffrey M. Yarus1
(1) Roxar, Houston, TX
(2) CPOC, Kuala Lumpur, Malaysia

Abstract: Integrated reservoir characterization and computer modeling; A reservoir case study of a tertiary tide dominated delta and its associated shallow marine deposits, Malay Basin, Offshore Gulf of Thailand

This study presents an integrated reservoir characterization using a variety of technologies to preserve the geological features in a 3D-reservoir model. The study, covering eight sequences, was based on well logs, borehole images, core data and 3D seismic, revealed detailed reservoir facies architecture of a tide dominated clastic shallow marine and deltaic environment. Sedimentological reservoir facies include distributary channels, mouth bars, tidal channels, tidal bars and tidal flats. Distinctive sedimentological structure and texture each sedimentological facies can be observed from well data. Seismic attribute images extracted for individual sedimentological layers provide important information about the distribution pattern of the facies. A conceptual sedimentological facies model was built for each sequence by integrating both well data and seismic data, and a complete facies interpretation was performed at each well. Based on the facies interpretation, a comprehensive petrophysical data analysis quantified the spatial variation and trend of reservoir properties in each facies.

To preserve the geological features observed, various techniques were used in reservoir modeling including deterministic and stochastic (pixel based and object based) approaches. Geostatistical modeling techniques used include Truncated Gaussian Simulation, and General Marked Point Process. The facies model built was conditioned to well observation, seismic analysis and conceptual facies models. Petrophysical modeling was performed for each facies separately using Sequential Gaussian Simulation. Spatial variation observed during data analysis was incorporated in the petrophysical model both inside the facies bodies and globally. All the major geological features observed were successfully preserved in the upscaled 3D-reservoir model for fluid-flow studies.

AAPG Search and Discovery Article #90914©2000 AAPG Annual Convention, New Orleans, Louisiana