一種基于SC-DTW的疊前道集剩余時(shí)差校正方法
[Abstract]:The underground medium is usually anisotropic and heterogeneous, resulting in conventional velocity analysis and motion, static correction is difficult to flatten the seismic in-phase axis, and there is still residual time difference in the seismic gathers after conventional processing. This is a common problem in AVO attribute analysis and prestack inversion. A new pre-stack gathers residual moveout correction method based on shape context (SC) and dynamic time regularization (DTW), is proposed and verified by numerical simulation and example analysis. The results show that the pre-stack gathers residual moveout correction method based on SC-DTW has better anti-noise ability, better robustness to seismic waveform distortion, and can effectively eliminate the residual moveout of prestack seismic trace. After processing, the waveform of seismic coaxial axis is continuous and the amplitude characteristics remain unchanged, which can improve the accuracy of seismic data processing and interpretation such as AVO attribute analysis and prestack inversion. Using the similarity of the seismic trace waveforms in the prestack gathers, the reference track is optimized. In the calculation window, each trace in the trace set is calculated by SC-DTW with the reference track, and its dynamic regularization path is obtained, and the residual moveout correction is carried out. Therefore, it has good practicability and popularization value.
【作者單位】: 成都理工大學(xué)工程技術(shù)學(xué)院;成都理工大學(xué)地球物理學(xué)院;
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目“孔隙介質(zhì)低頻地震衰減與頻散異常的識(shí)別機(jī)理及應(yīng)用”(編號(hào):41374134)、“復(fù)雜地震信號(hào)分?jǐn)?shù)域頻譜成像理論及應(yīng)用研究”(編號(hào):41274127) 四川省教育廳項(xiàng)目“基于時(shí)頻域波形分類的礁灘儲(chǔ)層預(yù)測(cè)方法研究”(編號(hào):16ZB0410)聯(lián)合資助
【分類號(hào)】:P618.13;P631.4
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