1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 2. Key Laboratory of Earth Exploitation and Information Technology, 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; 4. Yangtze Delta Region Institute of University of Electronic Science and Technology of China(Huzhou), Huzhou, Zhejiang 313099, China
Abstract：The effect of characterizing channels by using curvature and coherence is not obvious, and the performance of principal component analysis (PCA) on these attributes is poor. Although seismic texture, coherent energy, spectral peak, frequency division amplitude, and other attributes can identify some paleochannels well, there are some problems such as incomplete paleochannel characterization and limited identification range. Therefore, the method of seismic attribute PCA is proposed to identify paleochannels. The method finely characterizes paleochannels at different scales, and its prediction effect is better than that of a single attribute, which improves the identification accuracy of paleochannels. The following understandings are obtained: ①The three kinds of seismic attributes including seismic texture, coherent energy, and spectral peak can characterize paleochannels well, but their identification results of the paleochannels are not comprehensive. The effective information of channels identified by the three kinds of seismic attributes is fused by PCA, which can highlight the distribution characteristics and boundary morphology of paleochannels. ②According to the identification difference of channel change details by the instantaneous profile of frequency division amplitude, PCA is used to fuse the instantaneous amplitude attributes of different frequency bands to enhance the common detail information, which improves the identification accuracy of paleochannels. The proposed method is used to identify the channel in Shaximiao Formation in western Sichuan, and it accurately reflects the specific location and contour of the paleochannel.
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