地面地震资料的两分量合成

在用Ｐ波震源，一个垂直检波器与一个沿测线方向的水平检波器的转换波勘探中，垂直检波器和水平检波器都会接收到Ｐ波和ＳＶ波。所以，如何辨认和分离Ｐ、ＳＶ波就成为转换波资料处理中的一个重要步骤。在水平层状介质的假设条件下，利用矢量合成方法能较好地实现这个目的。由于该法对速度比较敏感，故取准速度（其中包托地表低降速带的速度）是该方法成功的关键。

Two-component composition of surface seismic data.

Both P wave and SV wave can be received by vertical geophone,or horizontal geophone in the converted-wave survey in which P-wave source,vertical geophone and horizontal geophone along seismic line are used simuhaneously.How P wave or SV wave can be recognized and separated out is an important matter in converted wave data processing.Vector composition method can be well used to achieve this when the assumption of horizontally-layered medium is made.The key to the suc- cessful use of this method in accurate velocity,including the velocity in near sur- face low-velocity layer,because it is sensitive to velocity.