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Study on attribute characterization for reservoir dynamic monitoring by seismic

Science china Earth Sciences 2008年第S2期51卷 218-225页

作者： chen xiaohong1,3,li jingye2.3 & zhao wei4 1 key lab of geophysical exploration of cnpc,{2. Petroleum university,beijing 102.4.,{2. 2.Basin & Reservoir Research Center,{2. Petroleum university,beijing 102.4.,{2. 3 State key laboratory of Petroleum Resource and Prospecting,{2. university of Petroleum,beijing 102.4.,{2. 4 Research Center of CNOOC,beijing 10002.,{2. key lab of {2. exploration of cnpc China Petroleum University Beijing China State key laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing China Basin & Reservoir Research Center China Petroleum University Beijing China Research Center of CNOOC Beijing China

Study on characterizing reservoir parameters dynamic variations by time-lapse seismic attributes is the theoretical basis for effectively distinguishing reservoir parameters variations and conducting time-lapse seismic interpretation,and it is also a key step for time-lapse seismic application in real oil fields. Based on the rock physical model of unconsolidated sandstone,the different effects of oil saturation and effective pressure variations on seismic P-wave and S-wave velocities are calculated and analyzed. Using numerical simulation on decoupled wave equations,the responses of seismic amplitude with different offsets to reservoir oil saturation variations are analyzed,pre-stack time-lapse seismic attributes differences for oil saturation and effective pressure variations of P-P wave and P-S converted wave are calculated,and time-lapse seismic AVO (Amplitude Versus Offset) response rules of P-P wave and P-S converted wave to effective pressure and oil saturation variations are compared. The theoretical modeling study shows that it is feasible to distinguish different reservoir parameters dynamic variations by pre-stack time-lapse seismic information,including pre-stack time-lapse seismic attributes and AVO information,which has great potential in improving time-lapse seismic interpreta-tion precision. It also shows that the time-lapse seismic response mechanism study on objective oil fields is especially important in establishing effective time-lapse seismic data process and interpreta-tion scheme.

关键词： time-lapse seismic dynamic monitoring rock physical model pre-stack attribute Amplitude Versus Offset (AVO)

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