An improved method of fracture prediction based on P-wave anisotropy and its application
Sun Wei1,2, He Zhiliang1, Li Yufeng3, Liu Zhiwei4, Zhou Yan1
1. Laboratory of Structural and Sedimentological Reservoir Geology, Exploration & Production Research Institute, SINOPEC, Beijing 100083, China;
2. China University of Petroleum (Beijing), Beijing 102249, China;
3. Geophysical Research Institute, Shengli Oilfield Branch Company, SINOPEC, Dongying, Shandong 257022, China;
4. Chinese Academy of Geological Sciences, Beijing 100037, China
Abstract：P-wave anisotropy is widely used for fractures prediction. However conventional methods have a defect, as only one migration velocity is used during the poststack migration for different azimuth data. So the prediction results may be inaccurate. To solve this problem, we propose an improved method. First velocity analysis is taken on different azimuthal gathers, and then velocity anisotropy is saved. So fracture prediction precision would be improved. Both conventional method and the improve approach are used on real prestack data for fractures prediction.Their results are compared with fractures obtained from well logging data. These examples show the validity of the improved method.
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