斜井声波测井曲线校正方法

Correction method for sonic logging trace from deviated well.

用斜井声波测井曲线生成的合成记录,不能用于沿斜井轨迹标定层位,只能在斜井井口垂直道上进行层位标定。但受地层倾角的影响,这样标定的层位有很大误差。因此,对斜井声波测井曲线进行了地层倾角校正和地层埋深校正,求出一条反映井口垂直道上地层物理特性的“虚”测井曲线。然后,用该曲线按直井方法生成合成记录,用来标定井口垂直道上的地震波层位。文中给出的应用实例表明,用该方法标定的地震波层位准确、可靠。这说明此方法在构造简单地区是适用的。

The synthetic seismogram derived from deviated well logging trace can not be used to make stratigraphic division along the deviated well.It may be applied to stratigraphic division for the vertical seismic trace at the head of the deviated well;however,great error occurs in such stratigraphic division because of bed dip influence.It is necessary,therefore,to make dip and depth corrections of the deviated well logging trace so as to obtain a‘pseudo’logging trace which re- flects the petrophysical property of a vertical seismic trace at the well head, Then the‘pseudo’vertical logging trace is used to produce synthetic seismo- gram that can be used to perform stratigraphic division for vertical seismic trace at the well head. The example shows that the stratigraphic division using this method is reli- able.This method is applicable for the area in which geological structure is simple.