【摘要】 本文基于几何地震学原理,分别利用VSP直达波、反射纵波及上行转换横波旅行时反演层速度。直达波旅行时反演只能获得检波点所在井段地层的速度;上行纵波旅行时反演能获得最深检波器以下地层的速度,即井底以下地层的速度;上行转换横波旅行时反演则能获得横波速度。本文主要研究利用VSP直达波和上行反射波求取井段及井底以下地层的速度,最终根据三维VSP资料获取三维速度体。更多还原

【Abstract】 On the basis of geometric seismic principle,this paper employs travel-time of VSP down-going P wave,up-going P-P wave and up-going P-S wave to calculate interval velocity.Down-going P wave travel time may get the interval velocity above the receivers.Up-going P-P wave travel time may get the interval velocity below the receivers.Up-going P-S wave travel time may get the S-wave interval velocity.Finally we obtain the 3D velocity volume velocity for the zone of interest using the first arrival travel-time inversion.更多还原