过套管偶极横波技术在压裂效果评价中的应用

The application of the dipole shear wave crossing casing to the evaluation of fracturing effect

偶极横波可以获得地层的纵波、横波和斯通利波。利用这些地球物理信息可以评价地层的各向异性,尤其是裂缝导致的油气储层的各向异性,从而有效评价压裂施工对储层的改造效果。通过分析对比鄂尔多斯盆地油气井压裂前、后过套管偶极横波测井资料,证明了过套管偶极横波在评价压裂效果的可行性,可以将偶极横波技术作为油气井压裂效果评价、探测油气井裂缝的一种常规技术。

The dipole shear wave can get the primary wave,shear wave and Stoneley wave in the formation,and the geophysical information obtained can be used to evaluate the anisotropy of formation,especially the anisotropy of oil-gas reservoir caused by fracturing,and to diagnose the formation reconstruction effect of fracturing operation. Contrasting the logging data of the dipole shear wave before fracturing with those after fracturing in oil-gas well of Ordos basin shows that the dipole shear wave crossing casing can be used to analyze the actual effect of fracturing. It will become a conventional logging technology to evaluate fracturing effect of oil-gas well and to detect cracks of oil-gas well.