基于声波测井资料的波动方程走时层析反演速度建模  

Velocity modeling through full wave equation traveltime tomography inversion based on sonic logging data

作　　者：李卿卿[1,2,3] 符力耘 杜启振 冉亚楠[1,2,3] 胡勇 LI QingQing;FU LiYun;DU QiZhen;RAN YaNan;HU Yong(National Key Laboratory of Deep Oil&Gas,China University of Petroleum(East China),Qingdao Shandong 266580,China;Shandong Provincial Key Laboratory of Reservoir Geology,China University of Petroleum(East China),Qingdao Shandong 266580,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Sciences and Technology,Qingdao Shandong 266071,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou Jiangsu 221116,China)

机构地区：[1]深层油气全国重点实验室(中国石油大学(华东)),山东青岛266580 [2]山东省油藏地质重点实验室,中国石油大学(华东),山东青岛266580 [3]青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071 [4]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《地球物理学报》2024年第2期641-653,共13页Chinese Journal of Geophysics

基　　金：深层油气重点实验室开发基金及“十四五”重大项目(2021QNLM020001);国家自然科学基金项目(42074132,41930429,42274154)联合资助.

摘　　要：地震勘探目标逐渐由浅层(<2000 m)转向中深层(2000~3500 m),高精度速度建模是实现精确地震成像的关键手段之一.目前,初至波或早至波速度层析建模方法已较为成熟,然而对深层速度建模更为重要的反射波层析建模方法依然面临走时拾取困难及计算量大等难题.针对当前中深层走时层析速度建模方法面临的难题,本文提出了一种基于声波测井资料的波动方程全波走时层析速度建模方法及策略.该方法首先通过早至波层析反演获得浅层及大尺度速度信息;其次,通过提取初次成像剖面的构造倾角信息,利用声波测井资料进行稀疏反演,进一步获得更高精度的速度模型;最后,以此为初始模型,进行全波层析反演获得最终偏移速度模型.数值结果表明,本文所提出的速度建模方法及策略不仅可以避免传统反射波层析建模方法因采用Born近似反偏移所带来的大计算量问题,且大幅提高了中深层速度建模的精度,进而能有效地提高中深层复杂构造区域的地震成像质量.Nowadays,the targets of seismic exploration gradually transform from the shallow layers(<2000 m)to the middle and deep layers(2000~3500 m),and the velocity modeling with high precision is one of the key methods to achieve accurate seismic imaging.At present,the first-arrival or transmitted wave velocity tomography method is relatively mature,but the reflected wave tomography method,which is more important for deep velocity modeling,still faces difficulties in traveltime picking and huge amount of computation.Aiming at the difficulties faced by the current medium and deep traveltime velocity tomography methods,this paper proposes a wave-equation-based full-wave traveltime velocity tomography method with sonic logging data.The numerical results show that the new velocity tomography method in this paper not only overcomes the problem of the traditional reflected wave tomography modeling method due to the huge amount of calculation from the Born approximation,but also greatly improves the accuracy of velocity modeling in the middle and deep layers,and further improves the imaging quality of the middle and deep layers.

关 键 词：声波测井 走时层析 平面波分解 稀疏反演 地震成像 

分 类 号：P631[天文地球—地质矿产勘探]