Multi-scale full waveform inversion based on double diagonal flux correction transport
YANG Ruidong1, HUANG Jianping1, YANG Zhenjie1, MU Xinru1, WANG Zhaozhong2, YANG Shanshan3
1. School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266580, China; 2. Institute of Geology and Mineral Resources of Shandong Province, Jinan, Shandong 250100, China; 3. RIPED Tarim Oilfield Company PetroChina, Korla, Xinjiang 841000, China
Abstract：The continuous furthering of oil and gas exploration exposes seismic exploration to increasingly complex issues. Full waveform inversion (FWI) has become a highly promising velocity modeling method due to its high accuracy. Nevertheless, its inversion effect is largely affected by the accuracy of the initial model and the frequency range of the shot record. In actual seismic data processing, the accuracy of the initial velocity model is often not high, despite that an accurate initial velocity model is the key to preventing FWI from falling into local extreme values. Therefore, reducing the depen-dence of FWI on the initial model is vital. For this reason, a multi-scale FWI method based on double-diagonal flux correction is proposed in this paper. Specifically, the two-dimensional time-domain acoustic wave equation is corrected by the flux-corrected transport technology to obtain the corrected wavefields of different frequency components. On this basis, the calculation formulas for FWI gradient and step size are derived, and multi-scale inversion is carried out with the corrected wavefields from low frequency to high frequency. Simulation tests with a modified Marmousi model are conducted to verify the effectiveness of the proposed method. The results show that the proposed method effectively expands the medium- and low-frequency components of the wavefield and reduces the dependence of FWI on the initial model.
杨瑞冬, 黄建平, 杨振杰, 慕鑫茹, 王兆忠, 杨珊珊. 基于双对角通量校正的多尺度全波形反演[J]. 石油地球物理勘探, 2022, 57(5): 1120-1128.
YANG Ruidong, HUANG Jianping, YANG Zhenjie, MU Xinru, WANG Zhaozhong, YANG Shanshan. Multi-scale full waveform inversion based on double diagonal flux correction transport. Oil Geophysical Prospecting, 2022, 57(5): 1120-1128.
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