摘要
为了处理横向强变速介质中的深度成像问题 ,本文提出一种基于共炮道集的优化系数的傍轴近似方程叠前深度偏移算子 ,并在基于反射系数估算的成像条件下 ,可实现叠前深度偏移成像 .该算子具有方程阶数低且能对陡倾角成像的特征 ,并采用有限差分法波场延拓 ,能适应速度场的任意变化 .当在频率 -空间域进行计算时 ,相对于纯粹的时间 -空间域有限差分算法有计算效率高、成像方便的优点 .脉冲响应测试和对Marmousi模型进行的叠前深度偏移结果表明 。
In this paper, We introduce a prestack depth migration operator with coefficients optimized paraxial wave equation on the common shot gathers. Under the imaging condition based on reflection coefficients estimating, the prestack depth imaging can be realized. The operator is low ordered equation but with high migration dip angle, and can accommodate arbitrary velocity variation owing to the finite difference algorithm. Contrasted with the methods in time space domain, this one has high computation efficiency and is prone to image, because all its computation is in frequency space domain. The impulse responses and the imaged result of the Marmousi model show that this migration operator has good imaging effect in strong laterally varying velocity media.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第3期389-395,共7页
Chinese Journal of Geophysics
基金
国家自然科学基金委资助
大庆石油管理局资助项目
