Influence of offset-related absorption on AVO analysis and its compensation
Li Guofa1, Zhang Xiaoming1, Peng Gengxin2, Yin Jinyin3, Cui Yongfu2
1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;
2. Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China;
3. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China
Abstract：Dynamic characteristics of seismic reflection are seriously distorted due to viscoelastic media absorption influence. For pre-stack seismic data, this influence consists of two parts. One is related with reflection depth, and the other is related with offset. And this offset-related absorption has dominant influence on AVO analysis. The offset-related absorption can be compensated by calculating the absorption differences between nonzero-offset and zero-offset records in CRP gather. In this way, lateral variations of reflection characteristic resulted from media absorption are eliminated, and the precision of AVO analysis and prestack inversion are improved.
