FROM SEISMIC TO RESERVOIR MODEL: AN INTEGRATED STUDY
W.E. SIMS, G.M. TILLER, J.J. FREEMAN, R.C. WATTENBARGER, C.S. LERCH, M.J. MAHAFFIE, 1996. "FROM SEISMIC TO RESERVOIR MODEL: AN INTEGRATED STUDY", Stratigraphic Analysis Utilizing Advanced Geophysical, Wireline and Borehole Technology for Petroleum Exploration and Production, Jory A. Pacht, Robert E. Sheriff, Bob F. Perkins
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Reservoir modeling can be split into two main categories: reservoir characterization and performance evaluation. The characterization of a reservoir involves the quantification of net sand, the spatial distribution and interconnection of the sands, and the rock and fluid property distributions within individual sands. The second step of reservoir performance evaluation combines this data with development strategies and economic considerations in order to optimize the performance of individual wells and the reservoir as a whole. A major focus of reservoir modeling is therefore the integration of the various modeling tools in such a way that all available data, including seismic, logs, cores, analog information, conceptual models, and production history, can be utilized and honored.
A reservoir model of the primary pay sands at Prospect Mars was created to assist development planning. An initial architectural model constrained to well control was developed, using an in house geological modeling program which includes capabilities similar to those in commercially available geological modeling programs. This model was further constrained through seismic inversion, using another in house program which again includes capabilities similar to those in commercially available model based seismic inversion programs. This reservoir model was then translated to a nonorthogonal grid geometry that was appropriate for the reservoir simulator. The resulting model was then used by the Mars Subsurface Team to assist in evaluating various development options.
The reservoir model can serve as the repository for all pertinent subsurface data in a quantitative format. The capability for quick updating with new well or seismic data also allows the model to always remain current. Most importantly, the reservoir description/simulation process provides for an efficient and meaningful link between the subsurface data and the final business decisions based on that data.