Seismic amplitude response characteristics of oil-bearing saturability variation of the oil pool model
WU Bao-Nian1,2,3
1. Exploration and Production Research Institute, SINOPEC, Beijing 100083, China;
2. SINOPEC International Petroleum Exploration and Production Corporation, Beijing 100083, China;
3. College of Geosciences, China University of Petroleum, Beijing 102249, China
To tackle the status that the reservoir fluid seismic detection technique cannot easily recognize oil bed (containing no gas),it is of great significance to study the relationship between the seismic response and the oil-water saturability under the condition of the difference in oil and water weak elastic parameters so as to improve the success rate of the oil bed seismic detection.Utilizing the vector wave field digital simulation technique,the author performed wave field forward processing of the oil pool under the condition of different oil-bearing saturabilities and,using the inversion results,tentatively studied the seismic response characteristics caused by the oil-bearing saturability variation in the oil pool that contains only oil-water mixed fluid,so as to provide reference for the seismic detection and quantitative interpretation of the oil bed.According to the results obtained,the AVO response characteristics of the oil reservoir that contains only oil-water mixed fluid are basically consistent under the condition of different oil-bearing saturabilities,and hence it is difficult to use routine means to distinguish oil from water.Nevertheless,through suppressing non-oil and gas response in the reflection of the oil reservoir and making prominent the oil and gas response by amplitude correction,the seismic response resulting from the oil-bearing saturability of the oil reservoir can be clearly observed,and the seismic response characteristics in different oil-bearing saturability ranges are different and exhibit evident nonlinear features.In this way,the seismic data carry fluid information of the oil reservoir,and the utilization of the seismic data to detect the oil-bearing potential and oil-bearing quantity is feasible.However,the reasonable interpretation of the oil-bearing potential and saturability should be based on the prerequisite of the correct understanding of the nonlinear relationship between the oil-bearing saturability variation of the oil reservoir and the seismic response.
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