Reservoir fracture prediction method and application based on structure-oriented filtering and coherent attributes of gradient structure tensor
CUI Zhengwei1,2, CHENG Bingjie1,2, XU Tianji3, NIU Shuangcheng1,2
1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 2. Key Lab of Earth Exploration & Information Techniques of Ministry of Education, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 3. School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China
Abstract：Gradient structure tensor (GST) coherence and structure-oriented filtering have their own advantages in fault interpretation, but there are few examples that combine them. This paper proposes a reservoir fracture prediction method based on the coherent attributes of GST and structure-oriented filtering. Firstly, the structure-oriented filtering method is used to compensate the anisotropy of seismic data, which can improve the signal-to-noise ratio and highlight the fault and fracture features. Then, using the optimized seismic data to extract the formation dip, azimuth, etc. to obtain basic data for calculating faults and fractures. Finally, based on the dip, azimuth, amplitude and other data, construct the directional derivative vector and GST. By calculating the eigenvalue and eigenvector of GST, the GST coherence highlighting the structural features of seismic data are extracted to realize fine identification of reservoir fractures. The reservoir fracture prediction method based on the coherent attributes of structure-oriented filtering and GST accurately predicted the fractures in the carbonate reservoirs in the upper Lei 4th member in western Sichuan Basin. The results show that the faults and fractures are mainly distributed below the T6 layer, which has continuous reflection and stable formation, and is a good caprock. Small and medium-scale faults and fractures (mainly structural fractures) are relatively developed in the upper Lei 4th member. They are natural channels for gas migration and spaces for gas accumulation.
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