基于屏方法的弹性波叠前深度偏移  

Elastic wave prestack depth migration based on screen method

作　　者：乐友喜[1] 袁青[1] 薛志刚[1] 郭旭光[2] 刘旺东[3] 李雪燕[2] 范光旭[4] 

机构地区：[1]中国石油大学地球资源与信息学院,山东青岛266555 [2]新疆油田勘探开发研究院,新疆克拉玛依834000 [3]新疆油田石西油田作业区,新疆克拉玛依834000 [4]新疆油田陆梁油田作业区,新疆克拉玛依834000

出　　处：《煤田地质与勘探》2009年第6期58-62,共5页Coal Geology & Exploration

摘　　要：弹性波成像是多分量地震勘探需要解决的关键技术之一。借鉴声波方程中傅立叶有限差分算子中的有限差分补偿方法,对弹性波相屏传播算子进行了大角度校正。在求取成像值时,采用了矢量成像条件,即通过极化矢量,将各分量投影极化方向,然后再成像,从而使波场中的信息得到充分利用,同时解决了P-SV波成像过程中的极性不一致问题。这样,便可以叠加多炮的成像结果,从而提高成像质量。利用模型数据,对大角度相位校正后的弹性屏延拓算子和矢量成像条件进行了试验,成像效果理想。Elastic wave migration is one of the key technologies of multicomponent exploration. In this paper, the finite-difference compensation in Fourier finite-difference method of acoustic equation is applied to elastic screen propagator. Vector imaging condition is used through calculating polarized vector, and projecting component to polarized direction. It makes the information carried in wave field used efficiently and resolves the polarization issue of P-SV in imaging, which allows partial images from different sources and can be stacked to generate a final image. Finally, elastic screen propagator with wide angle correction and vector imaging condition are tested with model data, and the migration result is ideal.

关 键 词：弹性波 矢量成像条件 大角度校正 多分量 屏方法 

分 类 号：P631[天文地球—地质矿产勘探]