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垂直地震剖面高斯束法偏移成像
王環¹,乔玉雷²,姚忠瑞²,李瑞忠¹
(1.中国石油大学信息与控制工程学院，山东东营257061;2.中石化胜利油田分公司物探研究院，山东东营257000)

摘要:

为了提高垂直地震剖面(VSP)成像质量,首次将高斯束偏移方法应用于VSP观测系统。给出了基于共炮点道集的VSP叠前高渐束偏移算法,在计算高斯束参数时，若相邻高斯束中心射线超过一定距离，则采用波前重建方法，更好地解决了阴影区问题，计算效率也提高了 2倍。模型试算和实际资料处理证明了高斯束偏移应用于VSP成像的可行性和有效性。

关键词: 垂直地震剖面(VSP) 高斯束偏移；波前重建；偏移成像

DOI：

分类号:

基金项目:中国石油天然气集团公司创新基金(07E1019);中H科学院知识创新工程重大项目(KZCXl -SW-18-04)

Vertical seismic profile imaging by Gaussian-beam migration

WANG Jun¹,QIAO Yu-lei²,YAO Zhong-rui²,U Rui-zhong¹

(1. College of Iriformalion and Control Engineering in China University of Petroleum，Dongying 257061，Shandong Province, China;2. Geophysical Research Institute of Shengli Oilfield, S1N0PEC, Dongying 257000, Shandong Province, China)

Abstract:

In order to improve the quality of vertical seismic profile ( VSP) imaging, the Gaussian-beam migration ( GBM ) was applied to VSP for the first time. A VSP prestack GBM algorithm that operates on common-shot-gather was presented. During the computation of Gaussian-beam parameter, the wave-front reconstruction method is used to calculate the wave field if the distance between the central rays of the two adjacent Gaussian-beams exceeds a certain value. This method can not only resolve the problem of shadow zone, but also improve the efficiency of computation by twice. The tests on both VSP model data and VSP field data show that the application of GBM to VSP imaging is feasible and effective.

Key words: vertical seismic profile(VSP) Gaussian-beam migration wave-front reconstruction migration imaging