基于解耦黏声VTI方程的井中地震逆时偏移成像  

Based on decoupled reverse time migration for viscoacoustic VTI media in borehole seismic

作　　者：丁奕文 谷丙洛 李振春[1,2] 张闪闪 王霁川 DING YiWen;GU BingLuo;LI ZhenChun;ZHANG ShanShan;WANG JiChuan(School of Geosciences,China University of Petroleum(East China),Qingdao 266580,China;Key Laboratory of Deep Oil and Gas,Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,青岛266580 [2]深层油气重点实验室,青岛266580

出　　处：《地球物理学进展》2023年第4期1563-1577,共15页Progress in Geophysics

基　　金：国家自然基金项目(42074133);中国石油重大科技合作项目(ZD2019-183-003);深层油气重点实验室(KEY LABORATORY OF DEEP OIL AND GAS)联合资助。

摘　　要：随着油气勘探开发程度的不断提高,勘探目标日趋复杂,隐蔽性不断增强,这对高精度成像提出了新的要求.井中地震由于其特殊的观测系统,具有接近目标地质体,避免近地表和环境干扰,得到的地震波信息更能直接反映地层的地质属性等优点.然而,地下介质的各向异性和黏滞性会影响井中地震的成像精度,因此需要发展针对该问题的井中地震黏声各向异性逆时偏移成像方法.本文基于SLS模型推导了振幅衰减项与相位频散相解耦表示的黏声各向异性波动方程,并基于此方程实现了高精度的井中地震黏声VTI介质逆时偏移成像方法.模型算例验证了本文方法的有效性,验证了所提出的方法可以有效提高成像剖面的分辨率,使得剖面能量更加均衡.With the continuous improvement of petroleum development,research objectives are becoming more concealment,which requires higher imaging accuracy.Due to the special observation system,borehole seismic has the advantages of approaching the target geological body,avoiding near-surface and environmental interferences.Therefore,seismic wave information obtained by borehole seismic can more directly reflect geological properties of the stratum.anisotropy and viscosity of underground media will affect the imaging accuracy of borehole seismic,so it is necessary to develop a borehole seismic viscoacoustic anisotropy Reverse Time Migration(RTM)imaging method for this problem.Based on the SLS model,a new viscoacoustic wave equation decoupled by amplitude attenuation and phase dispersion is derived in this paper.This equation can achieve high-precision migration of anelasticity and anisotropy in borehole seismic.Numerical examples verify the effectiveness of the proposed method,which can balance the energy and improve the resolution of the imaging profile considering the influence of anisotropy and anelasticity.

关 键 词：井中地震 SLS模型 各向异性 衰减补偿 逆时偏移 

分 类 号：P631[天文地球—地质矿产勘探]