A method of combining multi-channel signals to suppress the strong reflection through matching pursuit
YANG Zipeng1, SONG Weiqi1, LIU Jun2, CHEN Junan2, LIU qun2, WU Di1
1. School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266580, China; 2. Research Institute of Exploration and Development, Northwest Oilfield Branch Co., SINOPEC, Urumqi, Xinjiang 830011, China
Abstract：It is usually difficult to identify useful signals in and around strong reflections. Relying on the sparse representation ability of the matching pursuit algorithm, we propose a method for suppressing strong reflections through matching pursuit (TC-MMP) under the constraint of multiple traces. To determine the condition for terminating iteration in the process of signal decomposition, we introduce a residual ratio threshold into the ma-tching pursuit algorithm. Compared with fixed itera-tions or fixed residual threshold, this algorithm can improve the efficiency of signal decomposition. It is a matching pursuit algorithm under the constraint of a termination condition. First, seismic signals with strong reflections are decomposed by TC-MMP, and matching wavelets with the strongest energy are searched and regarded as the best matched strong reflections. Then the weighted energy coefficient is obtained based on the strong reflections extracted from multiple traces. It can increase the energy proportion of effective signals in strong reflections. Finally, the optimal parameter for suppressing strong reflections is obtained through tests, making the useful signals in strong reflections retained while the suppressed signals near the strong reflections highlighted. Applications to a theoretical model with a high-resistance layer and raw seismic data with well tops show that the proposed method is more reliable and effective than conventional methods. It can provide technical support to accurate reservoir description.
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YANG Zipeng, SONG Weiqi, LIU Jun, CHEN Junan, LIU qun, WU Di. A method of combining multi-channel signals to suppress the strong reflection through matching pursuit. Oil Geophysical Prospecting, 2021, 56(1): 77-85.
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