基于稀疏表示的非零井源距VSP波场分离方法

发布时间：2018-06-07 21:06

本文选题：非零井源距VSP + 多分量　；参考：《石油地球物理勘探》2017年01期

【摘要】：随着垂直地震剖面(VSP)技术的不断发展,高保真的波场分离成为VSP资料处理与应用的关键之一。引入欠定盲源分离思想,利用VSP波场的极化特征及多分量资料在时频域的稀疏性,提出一种基于稀疏表示的波场分离方法。该方法分为两步:第一步将地震信号变换到时频域,并估计极化矩阵;第二步在时频域分离各单一波场,再反变换回时间域。在第二步波场分离过程中,针对时频域波场稀疏性不足的情况,提出一种改进的最短路径分解法,在一定程度上解决了时频域局部信号混叠的问题。模型试算与实际资料处理结果表明,与传统方法相比该方法能够更准确地分离上、下行P-P波、P-SV波,分离后的波场保幅性较好,不存在混波、假频以及边界问题。
[Abstract]:With the development of vertical seismic profile (VSP) technology, high fidelity wave field separation has become one of the keys to the processing and application of VSP data. Based on the polarization characteristics of VSP wave field and the sparsity of multi-component data in time-frequency domain, a sparse representation based wave field separation method is proposed. The method is divided into two steps: in the first step, the seismic signal is transformed into time-frequency domain and the polarization matrix is estimated; in the second step, each single wave field is separated in the time-frequency domain and then inversely converted back to the time domain. In the process of second step wave field separation, an improved shortest path decomposition method is proposed to solve the problem of local signal aliasing in time-frequency domain due to the lack of sparsity in time-frequency domain. The results of model calculation and actual data processing show that compared with the traditional method, the proposed method can separate the P-P wave and P-SV wave more accurately, and the separated wave field has better amplitude-preserving property, and there are no problems of mixing, false frequency and boundary.
【作者单位】：同济大学电子与信息工程学院;
【基金】：国家自然科学基金项目(40872090)资助
【分类号】：P631.4

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