井间直达波层析成像的井斜校正研究与应用

Study on correction of well deflection by tomography of cross hole first arrival data and application.

在钻井过程中由于地层倾斜等原因 ,导致井的轨迹不是过井口的垂线 ,而是一条空间曲线 ,这就造成井间地震成像计算所用的初至旅行时存在偏差 ,影响成像精度。为此 ,本文提出了解决井斜校正的方法。通过对合成井间地震记录和实际记录进行试算 ,结果表明 ,该方法能够解决井斜造成的直达波旅行时误差 。

Because of dipping bed during drilling process,the wellhead crossed trace of well is no longer vertical line,but is the spatial curve,which resulted in deviation of first break time used by cross hole tomographic calculation,affecting the imaging precision.For that reason,the paper presented a method for correction of well deflection.The tests of synthetic cross hole seismic data and real data showed that the method can solve the errors of first break time caused by well deflection,improving the precision of velocity inversion.