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Time-lapse seismic response mechanism with changes of clay content based on BISQ model
HAO Zhen-jiang1,2,CHEN Xiao-hong1,LI Jing-ye1
(1.Key Laboratory of Geophysical Exploration of CNPC,China University of Petroleum, Beijing 102249, China ;2. CNOOC Research Center, Beijing 100027, China)
Abstract:
Based on two-phase BISQ model, energy diffusion and frequency dispersion of seismic wave field were studied under both macroscopic and microscopic condition. Based on siltstone rock physical model,the variation laws of reservoir elasticity modulus with clay content during water injecting development were analyzed. Furthermore,time-lapse seismic response numerical simulation and difference attribute analysis were studied. The variation laws of NRMS ( normalize root-mean-square) amplitude with offset for both P-P and P-SV components were investigated before and after clay content changes in rock model. The results show that oil-field dynamic development process can be simulated well with the changes of reservoir clay content. The time-lapse seismic response is remarkable at different components and offsets. P-P and P-SV NMRS amplitudes have obvious discrepancy with offset changes. And partial stack process technique will improve the precision of time-lapse seismic processing and interpretation.
Key words:  two-phase medium  BISQ model  time-lapse seismic  clay content  numerical simulation