关于VTI介质中多分量转换波地震数据采集的最佳接收时窗
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摘要
以P_P波时窗和P_SV波时窗的交叉部分作为VTI介质中P_P波、P_SV波联合采集的最佳时窗,在有效时窗内通过基于VTI介质的射线追踪法确定每个反射点的P_P波、P_SV波射线路径和相角,求解Zoeppritz方程得出P_SV波与P_P波反射系数(或透射系数)的比值,并将该比值的绝对值定义为控制因子G.以G值作为控制VTI介质中P_P波、P_SV波联合采集观测系统设计的主要参数,通过分析G值确定检波器位置的最佳接收时窗,得出优化VTI介质中多分量转换波地震数据采集的接收时窗的方法.
We consider the cross area of the PP_ and PSV_wave window as the best window for joint PP_ and PSV_wave acquisition in VTI media. Within the effective window, the PP_ and PSV_wave's raypathes and phase angles at all reflection points are calculated, and the reflection (or transmission) coefficients' ratios of PSV- to PP_wave solved from Zoeppritz equations are defined as the controlling factor G. Then we use G values as the main controlling parameters of joint PP_ and PSV_wave acquisition design in VTI media, determine the best receiving window of detectors by analyzing G values, and derive the method of optimizing the receiving window for acquisition of multi_component converted seismic data in VTI media.
We consider the cross area of the PP_ and PSV_wave window as the best window for joint PP_ and PSV_wave acquisition in VTI media. Within the effective window, the PP_ and PSV_wave's raypathes and phase angles at all reflection points are calculated, and the reflection (or transmission) coefficients' ratios of PSV- to PP_wave solved from Zoeppritz equations are defined as the controlling factor G. Then we use G values as the main controlling parameters of joint PP_ and PSV_wave acquisition design in VTI media, determine the best receiving window of detectors by analyzing G values, and derive the method of optimizing the receiving window for acquisition of multi_component converted seismic data in VTI media.
引文
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[14]Jean P,Bouchon M.Cross-borehole simulation of wave propagation.Geophysics,1991,56(7):1103~1113
[2]钟本善,刘学才,江玉乐.转换波勘探的若干问题.西南石油学院学报,1995,17(3):16~27Zhong B S,Liu XC,Jiang YL.Problems of converted P_SV_waves exploration.Journal ofSouthwestern PetroleumInstitute(in Chinese),1995,17(3):16~27
[3]Colin M,Philip W,Stuart C,et al.Optimal acquisition geometryfor determining seismic anisotropy.Canadian Journal of Exploration Geophysics,1993,29(1):132~139
[4]Xiangyang L.Fracture detection using azimuthal variation of P_wave moveout fromorthogonal seismic survey lines.Geophysics,1999,64(4):1193~1201
[5]张永刚,王,王妙月.目前多分量地震勘探中的几个关键问题.地球物理学报,2004,47(1):151~155Zhang Y G,Wang Y,Wang MY.Some key problems in current multi_component converted wave seismic exploration.Chinese J.Geophys.(in Chinese),2004,47(1):151~155
[6]Leon Thomsen.Weak elastic anisotropy.Geophysics,1986,51:1954~1966
[7]张文生,何樵登.横向各向同性介质中群速度的计算.物探化探计算技术,1997,19(2):97~102Zhang WS,He Q D.Calculation of group velocity in transversely isotropic media.Computing Techniques for Geophysical and Geochemical Exploration(in Chinese),1997,19(2):97~102
[8]王辉.基于图形结构的三维射线追踪方法.地球物理学报,2000,43(4):534~541Wang H.3_Draytracing method based ongraphic structure.Chinese J.Geophys.(in Chinese),2000,43(4):534~541
[9]赵连锋,朱介寿,曹俊兴等.有序波前重建法的射线追踪.地球物理学报,2003,46(3):415~420Zhao L F,Zhu J S,Cao J X,et al.Ray tracing using ordinal wavefront reconstruction method.Chinese J.Geophys.(in Chinese),2003,46(3):415~420
[10]芦俊,王,孟召平等.优化P_P、P_SV波联合采集观测系统设计方法.地球物理学进展,2003,4(18):715~723Lu J,Wang Y,Meng Z P,et al.Method of optimizingjoint P_P、P_SVacquisition geometry design.Progress in Geophysics(in Chinese),2003,4(18):715~723
[11]Aki K,Richards P G.Quantitative Seismology:Theoryand Methods.San Francisco:W.H.Freeman and Company,1980
[12]杜丽英,刘国明,杜丽娟等.VTI介质中地震波反射波合成记录的方法研究.地球物理学进展,2001,2(16):58~64Du L Y,Liu G M,Du L J,et al.The method of seismic and reflection wave synthetic seismogram in VTI media.Progress in Geophysics(in Chinese),2001,2(16):58~64
[13]刘清林,於文辉,陈林等.大井间距井间地震观测试验.地球物理学报,1999,42(4):549~556Liu QL,Yu WH,Chen L,et al.Crosswell seismic survey with large interwell separations.Chinese J.Geophys.(in Chinese),1999,42(4):549~556
[14]Jean P,Bouchon M.Cross-borehole simulation of wave propagation.Geophysics,1991,56(7):1103~1113
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