交叉偶极子声波成像测井技术及应用

交叉偶极子声波测井可以实现常规声波测井无法实现的对软地层的横波测井。利用交叉偶极子声波测井资料,可分析由裂缝和不均衡地应力等引起的地层各向异性,通过分离出的快、慢横波的时差和波至时间,计算出地层各向异性系数,评价地层各向异性;还可以利用斯通利波估计裂缝的张开度和评价地层的渗透性。本文介绍了哈理伯顿生产的交叉偶极子声波测井仪WSTT的基本结构和测量原理,主要用途和测井操作时的注意事项,以及在地层评价中的应用。

The Crossed Dipoles Acoustic Imaging Logging Technology and Its Application

The crossed dipoles acoustic logging can realize transverse wave well logging which conventional acoustic logging cannot do in soft formation. The crossed dipoles acoustic logging data can be used to analyse the formation anisotropy caused by fractures and unbalanced ground stress. Then the anisotropy coefficient can be worked out to evaluate the formation anisotropy by seperating the time difference and arrival time of the slow and fast transverse waves, and also to evaluate fracture stretch degree and formation permeability by Stoneley wave.This paper introduces the basic structure and measuring principle of Harlleburton crossed dipole acoustic logging tool--WSTT, and main use, caution notes in operation and applications in formation evaluation.