Fault identification with short-time Fourier transform frequency-decomposed coherence improved by synchronous extrusion
YAN Haitao1, ZHOU Huai-lai1,2, Niu Cong3, Wu Nanke1, ZHOU Jian1
1. College of Geophysics, Chengdu University of Technology, Chengdu, Shichuan 610059, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Shichuan 610059, China;
3. CNOOC Research Institute, Beijing 100028, China
Abstract：Limited by low resolution seismic data and background noise caused by stratigraphic occurrence,minor faults and fractures are very difficult to be accurately identified.To solve this issue,an approach is proposed in the paper.The high-frequency multi-resolution of short-time Fourier transform improved by synchronous extrusion decomposes seismic data volume spectrum into single-frequency data of different frequencies,and the multi-trace tilt-oriented coherence is used to cohe-rently calculate the single-frequency data volume.The proposed approach can effectively eliminate the background noise and improve seismic data resolution.The multi-trace tilt-oriented coherence can accurately characterize minor faults and fractures.This proposed approach is successfully applied to the fault identification in some work areas in the South China Sea and rather good results are achieved.
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