Time-lapse seismic AVO inversion based on a double-difference inversion strategy
FU Xin1, ZHANG Xiaolong2,3, SUN Yunqiang2, DAI Shiming4, JIA Junsheng3
1. Department of Geoscience, University of Calgary, Calgary, Alberta T2N 1N4, Canada; 2. College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China; 3. Shenzhen Osdiot Technology Co., Ltd., Hefei, Anhui 230001, China; 4. SINOPEC Geophysical Research Institute, Nanjing, Jiangsu 211103, China
Abstract：The time-lapse pre-stack seismic data contains important amplitude variation with offset (AVO) information. The inversion of time-lapse seismic data can yield dynamic changes in elastic parameters before and after oil reservoir development,which is conducive to the exploration of remaining oil distributions,the optimization of injection-production schemes,and the enhanced oil recovery of oilfields. The inversion of time-lapse seismic data in different years,however,is inconsistent,which often leads to inversion artifacts and incorrect interpretation results. To solve the problem,this paper introduces the double-difference inversion strategy in time-lapse full waveform inversion (FWI) into time-lapse AVO inversion. Meanwhile,the improved approximate equation of the seismic P-wave reflection coefficient in the ray parameter domain is employed as the forward modeling equation for time-lapse seismic AVO inversion. The model tests indicate that the time-lapse seismic AVO inversion method based on the double-difference inversion strategy is not sensitive to the influence of the inversion quality of the baseline model as well as the inconsistency in inversion behaviors of the baseline model and the monitoring model. Moreover,it can effectively suppress artifacts outside the target area and concentrate the inversion results in the target area to accurately reflect the changes in the reservoir,which improves the inversion accuracy of the target area and reduces the errors of oil reservoir interpretations. With strong anti-noise performance,this method can also stably and accurately perform the inversion of the changes in the P-wave and S-wave impedance of the reservoir and effectively reflect the slight change in the P-wave and S-wave impedance caused by the pressure change of the overlying formation.
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