于光明,姚陈
YU Guang-ming,YAO Chen(Institute of Geology

• 1:中国地震局地质研究所
• 2:中国地震局地质研究所 北京100029
• 3:北京100029

摘要(Abstract)：

界面上三维PS波(反射转换横波)的转换点在地表有相应的界面法向投影点,抽取CCP(共转换点)道集的实质就是确定不同方位上投影点距离炮点和对应检波点的比例关系。当界面倾斜时,该比例关系是界面的倾角、倾向、法向深度、炮检方位以及纵横波速度比等参数的函数。就上述参数通过这一比例关系是如何影响共转换点道集的构成及影响程度设计了特定的模型进行讨论。计算结果表明,忽视倾斜界面的影响将引起转换波抽道集的混乱,并造成后期成像的错误。
There is a projective point in the earth surface along the normal direction of the dipping interface for a common conversion point of three dimension PS-wave exploration.The essence of sorting CCP gathers is to calculate these proportions of the distance from shot to projection point and from receiver to projective point varies with azimuth.When the interface is dipping,these proportions are determined by the parameters including dip angle,dip direction,normal depth,azimuth and ratio of P-wave velocity and S-wave velocity.How do these parameters control these proportion dependences and affect the determination of common conversion point gather? What degree would they bring? In this paper,we will try to answer these questions by calculating some special models.The results show that it could cause disorder and error image of conversion wave gathers if we omit the influence of slanting interfac.

关键词(KeyWords)： 倾斜界面;共转换点;影响因素;抽取方法
slanting interface;common conversion point;influencing factor;sorting method.

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 于光明,姚陈
YU Guang-ming,YAO Chen(Institute of Geology

参考文献(References)：

• [1]TESSMER G,BEHLE A.Common reflection point data-stackingtechnique for converted wave[J].Geophysics,1988,36:671-688.
• [2]THOMSEN L.Converted-wave reflection seismology over inhomoge-nous,anisotropy media[J].Geophysics,1999,64:678-690.
• [3]YUAN J,LI X.PS-wave conversion-point equation for layeredanisotropic media[C]∥63rd Annual Conference.Extended Abstracts.Amsterdam,the Netherlands:European Association of Geoscientistsand Engineers,2001:112.
• [4]SCHNEIDER W A.A simple,exact solution for the P-SV wave conv-ersion point via prestack migration[J].Geophysics,2002,67:1634-1636.
• [5]YUAN CHUNFANG,PENG SUPING,LI CHUNMING.An exact so-lution of the conversion point for the converted waves from a dipping re-flector with homogeneous(isotropic)overburden[J].Geophysics,2006,71:7-11.
• [6]傅旦丹,何汉漪,朱宏彰,等.海上多分量地震资料处理技术研究[J].中国海上油气(地质),2003,17(4):259-263.
• [7]KEIITI A,PAUL G.Quantitative seismology theory and methods[M].1.San Francisco,USA:W.H.Freeman and Company,1980:106.
• [8]姚陈.倾角CDP和倾角CCP叠加[J].中国地球物理,2005:556.

文章评论(Comment)：