VSP波场分离  

VSP wave field separation

作　　者：朱光明[1] 徐志康[1] 杜有成[1] 

机构地区：[1]西安地质学院

出　　处：《石油地球物理勘探》1990年第2期161-167,244,共8页Oil Geophysical Prospecting

摘　　要：视速度和偏振是地震波的两个重要特性。根据 P 波和 S 波运两个特性的差异,就可以分离 VSP 波场。本文所用的 VSP 波场分离方法综合考虑了视速度特性和偏振特性。在三分量 VSP 资料(H_1、H_2、Z)中,可将其两个水平分量H_1、H_2按矢量合成方法求出总水平分量H,再根据地震波的视速度特性,将 H 和 Z 分量经τ-p 正变换得到τ-p 谱 U_H和 U_Z;然后根据地震波的偏振特性,在τ-p 域由 U_H 和 U_Z 得到 U_P 和 U_(SV),即 P 波和 SV 波的τ-p 谱。最后,再将U_P U_(SV)经τ-p 逆变换得到 P 波和 SV 波。用这种方法对理论模型和野外实测三分量 VSP 资料进行了处理,效果良好。Apparent velocity and polarization are important characters of seis- mic wave.VSP wave field can be separated using the corresponding characteristic diifferences between P-wave and S-wave.VSP wave field separation method recommended here considers both the apparent velocity and the polarization.The wave field separation of three component(H_1, H_2,Z)VSP data follows the following steps: Compose horizontal components H_1 and H_2 into total horizontal com- ponent H by using vector composition law. Make forward τ-p transform of H and Z to obtain their spectra U_H and U_Z in τ-p domain according to the property of apparent velocity. Use polarization property to obtain U_P and U_(SV) from U_H and U_Z in τ-p domain,which are τ-p domain spectra of P-wave and SV-wave. Perform inverse τ-p transform of U_P and U_(SV)so as to obtain P- wave and SV-wave. This method was used to process both synthetic data and real three component VSP data;good results were obtained.

关 键 词：垂直地震剖面 波场分离 

分 类 号：TE13[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]