Abstract：When carrying out 3-C VSP data acquisition,the direction of vertical component of geophone is generally vertically downward and the direction of its horizontal components is generally random,by which the azimuths and rotation of horizontal components are computed and implemented.When carrying out the 3-C VSP data acquisition in incline well,if the vertical component of geophone is along the well trail,it should carry out coordinate rotation of three components to obtain the vertical,radian and transverse components of seismic records,and computation of azimuths of horizontal components in geophone also needs to use these three components in this time.The paper firstly deduced the relationship between the coordinate of 3-C geophone in incline well and that after rotation,obtaining the rotation formula of 3-C VSP geophone in incline well; then the computational method azimuths of horizontal components in geophone of zero-offset and non-zero-offset VSP is given; finally,in view of practical zero-offset VSP data and 3-D VSP data in incline well,the azimuths of horizontal components in geophone are computed,and 3-C rotation orientation is carried out,which showed the effectiveness of the method presented in the paper.
