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本文介绍了新一代侧向测井仪:方位电阻率成象(ARI),该测井仪可在井眼周围进行深探测方位电阻率测量,其纵向分辨率高于双侧向测井(DLL)。它将12个方位电极装入DLL电极系,保留深侧向和浅侧向测量的同时,提供12条深探测方位电阻率曲线,由装在方位阵列上的浅探测辅助测量作方位电阻率的井眼校正。全覆盖式方位电阻率成象的空间分辨率虽比全井眼微电阻率成象低,但其浅探测灵敏度低则可弥补这一点。文章用实例说明了方位电阻率成象仪在非均质、裂缝地层评价和裂缝倾角计算中的应用,还以实例说明了薄层响应,格罗宁根效应与井眼影响的校正及仪器偏心等。
This paper presents a new generation of lateral logging tools: azimuthal resistivity imaging (ARI), which performs deep probing azimuthal resistivity measurements around the wellbore with a higher vertical resolution than dual lateral logging (DLL ). It incorporates 12 azimuthal electrodes into the DLL electrode system while retaining deep lateral and shallow lateral measurements while providing 12 deep probing azimuthal resistivity curves with shallow probing ancillary measurements on the azimuth array for azimuthal resistivity Wellbore correction. Although the spatial resolution of full-coverage azimuthal resistivity imaging is lower than that of full-borehole resistivity imaging, its shallow detection sensitivity can make up for this. The application of azimuth resistivity imager in heterogeneity, fracture formation evaluation and fracture inclination calculation is demonstrated by examples. An example is given to illustrate the response of thin layers, the effect of the Groningen effect and borehole correction, and the eccentricity of the instrument.