基于伪谱法的复杂构造模型双程波地震照明模拟  

Complex structure model illumination modeling with two-way wave equation based on pseudo-spectral method

作　　者：尹川 张金淼 顾汉明[2] 骆宗强 王剑 侯波 

机构地区：[1]中海油研究总院,北京100027 [2]中国地质大学(武汉)地球物理与空间学院,湖北武汉430074

出　　处：《石油地球物理勘探》2014年第4期641-647,1,共7页Oil Geophysical Prospecting

基　　金：国家"十二.五"科技重大专项(2011ZX05030001)资助

摘　　要：面向复杂构造目标的地震照明分析对采集观测系统的优化设计具有重要的指导意义。照明分析方法中以双程波波动方程法在理论上更具优势。但常用的双程波波动方程有限差分方法受计算精度和计算效率的限制。本文将基于伪谱法的波场外推算子应用于双程波地震照明的计算中,通过简单透镜体模型试算表明,伪谱法双程波照明能够有效地克服数值频散现象,同时不受传播角度的限制,计算的地震波场照明能量精度高、波场信息丰富。将该方法用于Marmousi模型的照明模拟和分析,结果表明基于伪谱法的双程波地震照明模拟能够适应强烈的横向速度变化。利用波场上传法、地面源照明分析,能够对复杂构造目标的采集观测系统进行评价和优化。Complex structure targets oriented seismic illumination has an instructive significance for acquisition geometry optimized design.However finite difference methods are often limited by accuracy and efficiency although two-way equation methods have obvious advantages over other methods in theory.In this paper,pseudo-spectral method based wave field extrapolation operator is used to calculate two-way seismic illumination.Test results on simple lens model indicate that two-way seismic illumination calculated by pseudo-spectral method can effectively overcome numerical dispersion without propagation angle constraints.Calculated seismic illumination energy has more accuracy and richer wavefield information than that obtained by oneway methods.The proposed method is also applied to illumination modeling on Marmousi model.The results show that the method can deal with violent variation of lateral velocity,and optimize acquisition geometry for complex structure targets.

关 键 词：地震照明 复杂构造 伪谱法 波场外推 观测系统优化 

分 类 号：P631[天文地球—地质矿产勘探]