Abstract：Zhangqiang area,which belongs to Liaohe peripheral basins,is restricted by the influence of the surface conditions and underground geological structure,and hence data-processing has met with great difficulties.Lots of targeted measures have been taken in field acquisition, but part of the original data signal-to-noise ratio remains low,causing a certain impact on data processing.According to the characteristics of the original data for PSTM,the prestack data purification was conducted, and the accurate three-dimensional velocity field and the appropriate parameters were established to obtain a reasonable process flow.PSTM results show that the profile's breakpoint and fault are clear,and the homing of the diffracted wave was accurate.A comparison with the old data shows that the signal-to-noise ratio,resolution and deep imaging are improved significantly and can better reflect the structural form and stratigraphic architecture and meet the demand of the subsequent interpretation and inversion.
