石油地球物理勘探2023，Vol.58Issue(6)：1392-1397,6.DOI:10.13810/j.cnki.issn.1000-7210.2023.06.011
约束层析反演在砂砾岩体速度建模中的应用
Application of constrained tomographic inversion in seismic velocity modeling of glutenite bodies
摘要
Abstract
Glutenite bodies widely exist in steep slope zones of faulting depression basins,and they can develop various hydrocarbon reservoir types with great exploration potential.However,due to their complex spatial distribu-tion and overlap relationship,and large velocity differences with the surrounding rocks,it is difficult to employ the conventional grid tomographic modeling methods in the imaging domain to obtain their refined models.Thus,based on the grid tomographic inversion method in the imaging domain,this paper proposes a constrained tomographic in-version method in the imaging domain to improve the modeling accuracy of glutenite bodies.The thought of layer constraints is adopted,and the spatial distribution information of glutenite bodies obtained from seismic interpretation is combined to delineate key inversion regions.Meanwhile,it introduces the logarithmic barrier function and limits the velocity variation range of the glutenite bodies by applying inequality constraints to improve the modeling accu-racy of the bodies.The application results in the BS work area indicate that compared with the original grid tomo-graphic model,the velocity model built by this method is more consistent with the glutenite body distribution in the imaging section.Compared with the results of the fusion model,it can reveal the velocity changes inside the glutenite body,and the quality of its corresponding imaging section is also improved.关键词
砂砾岩体/层析/偏移速度建模/深度域/内罚函数/不等式约束Key words
glutenite body/tomography/migration velocity modeling/depth domain/internal penalty function/in-equality constraint分类
地质学引用本文复制引用
金昌昆,秦宁,关键,宗兆云,李坤,刘群强..约束层析反演在砂砾岩体速度建模中的应用[J].石油地球物理勘探,2023,58(6):1392-1397,6.基金项目
本项研究受中石化科技攻关项目"全节点高密度地震技术研究及应用"(PZ1061)、胜利油田科技攻关项目"砂砾岩体高精度速度建模及成像技术研究"(YKW2109)、"基于国产超算集群的高效叠前偏移技术研究(一期)"(YKW2302)和"面向海量数据的叠前偏移成像软件"(YKF2309)联合资助. （PZ1061）
