CAJ | 학술논문

为适应复杂构造和岩性油气藏勘探开发对地震处理精度的需求，一种源于反演思想的最小二乘偏移算法应运而生。基于最小二乘偏移基本理论，推导了互为共轭的正传播和反传播算子，实现了基于裂步DSR的最小二乘偏移算法。在算法优化的基础上，将算法分别应用于水平层状和Marmousi模型进行偏移试算，结果证实了LSM不仅适用于复杂地质构造成像，且经过多次迭代后的成像质量在局部区域要优于常规偏移方法，具体表现为：1）成像分辨率有一定提高；2）中深层能量得到有效补偿。
위괄응복잡구조화암성유기장감탐개발대지진처리정도적수구，일충원우반연사상적최소이승편이산법응운이생。기우최소이승편이기본이론，추도료호위공액적정전파화반전파산자，실현료기우렬보DSR적최소이승편이산법。재산법우화적기출상，장산법분별응용우수평층상화Marmousi모형진행편이시산，결과증실료LSM불부괄용우복잡지질구조성상，차경과다차질대후적성상질량재국부구역요우우상규편이방법，구체표현위：1）성상분변솔유일정제고；2）중심층능량득도유효보상。
In order to adapt for the exploration and development of complex structures and lithologic hydrocarbon reservoirs ,least-squares migration method applying inversion is proposed .In this paper , based on the basic theory of least-squares migration (LSM) ,we deduced the forward propagator and its adjoint of back propagator ,and then LSM based on split-step DSR was implemented .We tested this algorithm via four layers and SEG/EAGE Marmousi velocity model .The image results demonstrate that LSM has not only a high image resolution for the complex media ,in addition ,there will be a better image quality than conventional migration method after several iterations of conjugate gradient method for some local regions in the follow aspects :1)the image resolution is highly improved ;2)A better imaging energy compensation for the deeper part of the model .