摘要
复杂岩性油气藏勘探开发需要高保真的地震成像资料。与常规偏移方法相比,最小二乘逆时偏移(LSRTM)成像基于反演理论,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剖面,成为当前成像方法的研究热点和发展趋势。通过对误差泛函建立、逆时反偏移数据重构算法、Hessian逆预条件梯度计算及基于高斯-牛顿法的反演迭代更新方法等关键技术研究,实现了迭代最小二乘逆时偏移成像。为了使该偏移成像方法能够应用于实际资料,研究了针对性的数据预处理技术和最小平方匹配滤波模拟数据校正处理技术,探索建立了面向实际资料的最小二乘逆时偏移实现流程。某探区实际二维地震资料的最小二乘逆时偏移成像结果表明,相比传统的逆时偏移成像技术,最小二乘逆时偏移在成像分辨率和保幅性方面具有一定的优势。
High fidelity imaging method is required by complex lithology reservoir exploration and development.Compared with the conventional migration method,least-squares migration imaging based on inversion theory could provide high resolution imaging with more fidelity for lithologic reservoir estimation,which is becoming a research focus and trend of migration imaging method.We establish the functional error,reserve-time de-migration data reconstruction algorithm,Hessian inverse preconditioned gradient calculation and inversion iteration updating based on Gauss-Newton method,to realize the leastsquares reverse-time migration imaging.In order to make it available to the field data,we study targeted data preprocessing and least-squares matching filter simulation data correction technology and build least square reserved-time migration workflow oriented to field data.The imaging results of least-squares reserve-time migration to an actual seismic data shows its advantages in imaging resolution and amplitude preservation,compared with conventional reverse-time migration technique.
出处
《石油物探》
EI
CSCD
北大核心
2015年第3期301-308,共8页
Geophysical Prospecting For Petroleum
基金
国家科技重大专项(2011ZX05014-001-002)专题资助
