束偏移技术在海洋地震资料中的实际应用  

Practical application of beam migration to marine seismic data

作　　者：王炜 袁茂林[2] 李振春[3] 段新意 杨继东[3] 刘延旭 董水利 

机构地区：[1]中海油服物探事业部数据处理解释中心,天津塘沽300451 [2]中国石油化工股份有限公司勘探分公司,四川成都610041 [3]中国石油大学(华东)地球物理系,山东青岛266580

出　　处：《地球物理学进展》2016年第3期1181-1186,共6页Progress in Geophysics

基　　金：SWPI(Seismic Wave Propagation and Imaging)课题组对本项研究的支持

摘　　要：渤海地区广泛存在潜山、高陡等复杂构造,给地震偏移成像带来巨大的挑战.本文基于高斯束偏移基本理论,根据有效信号和干扰信号在τ-p域的能量差异设定阈值进行滤波,从而对束形成过程进行有效控制,实现了一种适用于低信噪比实际资料的束偏移成像方法.通过处理渤海某探区实际资料,并将成像结果与Kirchhoff偏移结果对比表明:改进的束偏移不仅能够有效地提高成像剖面信噪比,而且能够较精确地成像潜山、高陡等复杂构造.Complex subsurface structures such as buried hills and steep dips in the Bohai sea bring great challenges to seismic migrated imaging. Based on the basic theory of Gaussian beam migration（ GBM）, we have realized a beam migration method appropriate for real data with low signal-to-noise ratio（ S / N） by setting a filter to remove incoherent seismic events in τ-p domain.We have tested real data in the Bohai sea, and compared our imaging results with those produced by Kirchhoff migration.Numerical results show that this improved beam migration method not only enhances the S / N,but also accurately images complex structures such as buried hills and steep dips.

关 键 词：束偏移 海洋地震资料 潜山 高陡构造 Τ-P域 

分 类 号：P631[天文地球—地质矿产勘探] P738[天文地球—地质学]