应用保幅逆散射成像条件的全波场偏移方法  

Full⁃wavefield migration method by amplitude⁃preserving inverse scattering imaging condition

作　　者：徐洁 杨继东 王扬州 黄建平[1] 郭威 杨永红[3] XU Jie;YANG Jidong;WANG Yangzhou;HUANG Jianping;GUO Wei;YANG Yonghong(School of Geosciences,China University of Petroleum(East China),Qingdao,Shandong 266580,China;Shandong Energy Group South America Co.,Ltd,Qingdao,Shandong 266580,China;Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying,Shandong 257022,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]山东能源集团南美有限公司,山东青岛266580 [3]中国石化胜利油田分公司勘探开发研究院,山东东营257022

出　　处：《石油地球物理勘探》2024年第1期98-109,共12页Oil Geophysical Prospecting

基　　金：国家自然科学基金优秀青年项目(海外)“油气勘探地球物理”(ZX20230152);山东能源集团深层高温地热重大科技项目“山东省深层高温地热资源形成机制、分布规律研究及地热资源调查评价”(SNKJ2022A06‑R23);中国石油重大科技专项“深层复杂高陡构造成像关键技术”(ZD2019‑183‑003)联合资助。

摘　　要：地震波传播机制与成像机理逐渐成熟化、系统化,对于多次散射波的处理不再局限于噪声去除,而是将其用于高精度地震成像。不同于基于单次散射的常规成像方法,全波场偏移是一种基于多次散射假设与反演理论的数据驱动成像方法。基于逆散射成像理论,对现有全波场偏移的成像条件进行改进,发展了一种保幅逆散射成像条件,实现了高精度地震成像。该成像条件是通过对已有的直达波估计与下行格林函数互相关成像条件添加拉普拉斯滤波和照明项,衰减后向散射并补偿深部能量。相较于原有成像条件,改进后的保幅逆散射成像条件对于复杂构造具有更高的成像精度和更强的适应性。数值测试验证了方法的有效性和适用性。As seismic wave simulation and imaging methods have made great progress,multiple scattering waves are no longer suppressed as the noise but are used for high‑precision seismic imaging.Unlike the conventional imaging method that is based on single scattering,the full‑wavefield migration is a new data‑driven method for imaging all scattering waves based on the multiple scattering assumption and inversion theory.Based on inverse scattering imaging theory,this paper improves the existing full‑wavefield migration scheme and develops an amplitude‑preserving inverse scattering imaging condition for high‑precision seismic imaging.Laplacian filter and source illumination term are added the cross‑correlation imaging condition of the existing direct wave estimation and downward Green’s function to attenuate backscattering and compensate for deep energy.The improved amplitude‑preserving inverse scattering imaging condition produces higher imaging accuracy and stronger adaptability for complex structures than the traditional imaging condition.Numerical tests demonstrate the effectiveness and applicability of the proposed method.

关 键 词：成像条件 全波场偏移 保幅逆散射 多次散射波 成像条件 

分 类 号：P631[天文地球—地质矿产勘探]