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基于反演理论的最小二乘偏移可为岩性储层估计提供更加保真的、高分辨率反射系数成像,成为当前成像方法的研究热点和发展趋势.研究讨论了实现过程中关键技术环节,包括有限差分解微分方程进行反偏移数据重构,基于数据残差逆时偏移求取梯度及共轭梯度法反演优化算法,并重点研究了最小二乘偏移用于实际处理时的数据残差求取方法,包括面向最小二乘偏移技术的观测数据预处理及能量一致性数据残差求取,探索建立了面向实际资料的最小二乘逆时偏移实现流程,模型和实际资料试处理说明了此方法技术的适用性和有效性.
Least-square migration based on inversion theory can provide more fidelity and high-resolution reflection coefficient imaging for lithologic reservoir estimation, which has become the research hotspot and development trend of current imaging methods.Research and discussion of the key technology aspects in the implementation process , Including the finite difference differential equation to perform the anti-offset data reconstruction, based on the data residual inverse time gradient to obtain the gradient and the conjugate gradient method inversion optimization algorithm, and focus on the least square offset for the actual processing Including the pretreatment of observational data and the energy consistency data residuals based on Least Squares Offset technique, and explores the establishment of data-oriented least squares inverse time migration realization process, and the model and The actual data processing shows the applicability and effectiveness of this method.