一种基于SC-DTW的叠前道集剩余时差校正方法
发布时间：2019-03-25 21:06
【摘要】：地下介质通常具有各向异性和非均质性,导致常规速度分析及动、静校正难以拉平地震同相轴,常规处理后的地震道集仍然存在剩余时差,这是AVO属性分析和叠前反演常遇到的难题。基于形状上下文(SC)和动态时间规整(DTW),提出了一种新的叠前道集剩余时差校正方法,并对该方法进行数值模拟和实例分析验证。结果表明:基于SC-DTW的叠前道集剩余时差校正方法具有较好的抗噪能力,对地震波形畸变具有较好的鲁棒性,能够有效消除叠前地震道的剩余时差;处理后的地震同相轴波形连续,振幅特征未改变,可以提高AVO属性分析、叠前反演等地震资料处理解释的准确性。该方法利用叠前道集内各地震道波形的相似性,优选出参考道,并在计算时窗内将道集中的每一道都与参考道进行SC-DTW计算,求取其动态规整路径,进行剩余时差校正,因而具有较好的实用性和推广价值。
[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.
【作者单位】： 成都理工大学工程技术学院;成都理工大学地球物理学院;
【基金】：国家自然科学基金项目“孔隙介质低频地震衰减与频散异常的识别机理及应用”(编号:41374134)、“复杂地震信号分数域频谱成像理论及应用研究”(编号:41274127) 四川省教育厅项目“基于时频域波形分类的礁滩储层预测方法研究”(编号:16ZB0410)联合资助
【分类号】：P618.13;P631.4
本文编号：2447317
[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.
【作者单位】： 成都理工大学工程技术学院;成都理工大学地球物理学院;
【基金】：国家自然科学基金项目“孔隙介质低频地震衰减与频散异常的识别机理及应用”(编号:41374134)、“复杂地震信号分数域频谱成像理论及应用研究”(编号:41274127) 四川省教育厅项目“基于时频域波形分类的礁滩储层预测方法研究”(编号:16ZB0410)联合资助
【分类号】：P618.13;P631.4
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