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Third-Order Cumulant to Perform Normal Moveout without Stretching Distortions
LIANG Shanglin, WANG Chunming, LI Yanmin, ZHANG Zheng, HU Tianyue, CUI Dong, HOU Sian, YAN Yixuan, HU Lianlian
Acta Scientiarum Naturalium Universitatis Pekinensis    2025, 61 (1): 77-85.   DOI: 10.13209/j.0479-8023.2024.101
Abstract1146)   HTML    PDF(pc) (3978KB)(2775)       Save
Traditional normal moveout (NMO) method not only suffers from severe stretching distortion on shallow and far offset traces, but also is particularly sensitive to NMO velocity. Based on the latest reflection seismic interferometry, this paper introduces the third-order cumulant in NMO process to solve above-mentioned issues. The method expands the application scope and is a more universal expression of traditional seismic interferometry in theory. This article first provides a rigorous theoretical derivation, then tests and verifies its noise resistance using model data, and finally applies it to field data in western China. The results show that the proposed method solves the problem of stretching distortions in far offset gathers without the need of correction velocity, and has better noise suppression effect compared with other two methods.
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Two Kinds of Gradient Representations for Nielsen Equations
MEI Fengxiang,WU Huibin,LI Yanmin
Acta Scientiarum Naturalium Universitatis Pekinensis    2016, 52 (4): 588-591.   DOI: 10.13209/j.0479-8023.2016.078
Abstract1832)   HTML    PDF(pc) (250KB)(1266)       Save

The two kinds of generalized gradient systems are proposed and the characteristics of the two systems are studied. The conditions under which the Nielsen equations can be considered as one of the two generalized gradient systems are obtained. The characteristics of the generalized gradient systems can be used to study the stability of solution of the Nielsen equations. Some examples are given to illustrate the application of the results.

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