Fast two-step interpolation algorithm for seismic data
MA Zechuan1, LI Yong1,2, CHEN Lixin1, CHEN Jie1, WANG Pengfei1, LI Xuemei1
1. School of Geophysics, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Chengdu University of Technology), Chengdu, Sichuan 610059, China;
Abstract:In order to improve interpolation efficiency and choose an optimal interpolation scheme,based on the analysis formula of convex set projection (POCS) algorithm and iterative threshold (IST) algorithm,fast iterative shrinking threshold (FIST) algorithm and fast convex set projection (FPOCS) algorithm are developed.The basic idea is that the interpolation results from the previous step and the interpolation results from the first two steps are linearly combined with the linear operator to get the iterative contraction operator,and the interpolation algorithm is used for interpolation.Then a new quality control criterion is introduced to improve the computational efficiency and accuracy.IST,POCS,FIST and FPOCS algorithms are used to interpolate the incomplete seismic data of the four-layer seismic model and Marmousi model established by Seismic Lab,and the best threshold strategy is selected and finally verified by actual seismic data.The results show that the signal-to-noise ratio from an exponentially declining thre-shold is higher than those from a constant threshold,a linearly declining threshold and a data-driven threshold.Combined with termination criterion,when the maximum iterations are 35 to 50,a better interpolation effect can be obtained.
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