1. Key Laboratory of Earth Exploration & Infomation Techniques(Chengdu University of Technology), Ministry of Education, Chengdu, Sichuan 610059, China; 2. Northwestern Sichuan Gas District, PetroChina Southwest Oil & Gas Field Company, Jiangyou, Sichuan 621700, China
Abstract：Given the amplitude-versus-offset (AVO) difference between seismic waves in anisotropic and isotropic media, Xiong Xiaojun et al. proposed a prestack fracture prediction method based on standard deviation statistics and the macroscopic trends of the fracture prediction results were correct. However, due to narrow-azimuth or single-azimuth seismic data (with low coverage), the predicted fracture zone has poor connectivity. Therefore, the fracture prediction process of the standard deviation statistical method was improved and fracture fusion analysis was introduced. As a result, the defect of using narrow-azimuth or single-azimuth data to predict fractures was overcome and the three-dimensional spatial distribution characteristics of high-angle fracture zones were accurately characterized. First, the narrow-azimuth pre-stack fracture prediction based on standard deviation statistics was adopted. Then, the fracture fusion technology based on grid clustering analysis was introduced. Finally, a fracture data volume with strong vertical and horizontal continuity was obtained. The application results of marine narrow-azimuth prestack seismic data in the N area of China show that the proposed method can characterize the distribution characteristics of high-angle fracture zones. It has a high degree of conformity with the drilling data and is suitable for high-angle fracture zones.
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