非零井源距VSP三分量记录的处理

PROCESSING OF THE THREE COMPONENTS OFFSET VSP DATA

长庆油田物探处计算站

本文采用偏振投影方法分离了非零井源距VSP三分量记录的P波和P—SV转换波的上行波,得到这两种上行波的最大能量的记录;采用旁轴射线法对VSP的CDP叠加进行偏移处理,克服了“画弧”现象。通过对比同一口井的P波、P—SV波的上行波CDP叠加剖面,搞清了这口井砂层段含气层的横向变化。

What was described in this paper is the upgoing events of P and PSVwave on three components offset VSP records were separated by dint of the technique of polarization projection . By doing so,the record with the maximum energy of these two kinds (namely,the P and the PSV waves) of upgoing events was obtained. The VSP CDPS data were migrated bv using the paraxial raypaths technique, hence, the "bow ties" were thus cancelled. The lateral variation of the sand body in gas bearing formation for a certain well would be made clear by comparing the CDPS section of the P and PSV upgoing events obtained from the same well.