井间地震资料中的横波信息

The S-wave information in crosswell seismic data

中国石化胜利油田物探研究院,山东东营257022

Geophysical Research Institute of Shengli Oilfield Company Limited, Dongying 257022, China

井间地震的资料证明,在"拟均匀介质"的地层中,即便用压电检波器也可以记录到"横波"资料。这种横波实际上是在液-固-液介质变化的情况下经过两次转换的P-S-P波。从运动学的角度来看,这种P-S-P波可以被看作"横波"。通过分析研究,总结了这种横波的特点以及在井间地震记录上确定它的有效的判别准则。横波资料的获得,为井间地震的成果资料的解释应用开辟了新的领域和途径。

Crosswell seismic practices reveal that one kind of so called shear wave can be recorded even using piezoelectricity hydrophone in quasi homogeneous media. This kind of shear wave is actually P-S-P converted wave produced as change of a medium from liquid to solid and to liquid. We refer to this two times converted compressional wave as shear wave which is discussed in this paper from the point of view of kinematics. We summarized some characters of the shear wave and advanced effective rules to distinguish the shear wave on crosswell seismic record.