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基于粘声衰减补偿的最小二乘逆时偏移

石油物探

2018年 57卷第No. 3期

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Title

Least-squares reverse time migration based on visco-acoustic attenuation compensation

单位

(1.中国石油大学(北京),地质地球物理综合研究中心,北京102249;2.中国石油化工股份有限公司石油勘探开发研究院,北京100083)

Organization

(1.Lab for Integration of Geology and Geophysics,China University of Petroleum,Beijing 102249,China;2.Sinopec Petroleum Exploration & Production Research Institute,Beijing 100083,China)

摘要

实际地下介质普遍存在粘滞性,地震波在介质中传播时存在衰减现象。为了减弱这种透射损失,补偿深层衰减的能量,改善成像效果,实现深层保幅偏移成像,基于标准线性固体粘弹性机制,在粘声介质逆时偏移的基础上,引入最小二乘的思想,实现了基于粘声衰减补偿的最小二乘逆时偏移(LSRTM)。同时,将该方法应用于层状模型与Marmousi模型试算,验证了方法的正确性及有效性。研究结果表明,该方法能够有效补偿吸收衰减作用损失的能量,实现高分辨率地震保幅成像。

Abstract

Viscosity is common in underground media,and seismic waves will be attenuated while they are propagating.In order to reduce the transmission loss,compensate the attenuated deep energy,improve the imaging effect and realize the deep amplitude-preserving migration imaging,a least squares reverse time migration for visco-acoustic media is proposed.The method is proposed by introducing the least square inversion theory to the reverse time migration of visco-acoustic media,based on the standard linear solid viscoelasticity mechanism.Tests on a layered model and Marmousi model data showed that this method can effectively compensate for the energy loss due to absorption and attenuation,with high resolution and amplitude-preserving.

关键词：

粘声介质; 逆时偏移; 最小二乘; 保幅成像; 补偿; 吸收衰减;

Keywords:

visco-acoustic media,; reverse time migration,; least squares,; amplitude-preserving imaging,; compensation,; absorption and attenuation;

基金项目

国家科技重大专项(2017ZX05049-002-007)资助。

DOI

10.3969/j.issn.1000-1441.2018.03.011