Complex
    piedmont is characterized by rugged surface, large-dip overthrust nappe
    structure, complex fault relations, etc. Traditional offset VSP data processing
    method cannot solve the imaging problem for the structures in complex piedmont.
    In order to solve the static correction problem, the VSP imaging strategy was
    changed from traditional time-domain imaging into depth-domain imaging, and
    then datum correction was carried out uniformly after imaging. Meanwhile, Kirchhoff
    depth-domain integral imaging method was utilized. In terms of the
    characteristics of VSP observation, zero-offset VSP and offset VSP fist arrival
    were adopted to calculate the observation time. The method was applied to the
    VSP data processing in two adjacent wells at the complex piedmont in Kuche area,
    and the result is well coinciding with the drilling data.