多频油基电成像测井极板间隙影响考察与校正方法

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中图分类号：P631.84 文献标志码：A

Abstract：To eliminate the influenceof electrode padgaponimaging qualityunderoil-basedmud wellconditions and toobtainhigh-qualitywelboreimages，theresponsecharacteristicsofamultifrequencyoil-basedelectrical imaging loging tool weresimulatedusingathre-dimensional finiteelement method.The efectsofoperating frequency，boreholeenvironment， andelectrode pad gaponthetol'sdetectioncharacteristics were investigated.Onthis basis，animage corectionmethod was developed.Byintegrating multifrequencyintersectionand phase analysis，aclassification-basedcorrection approach was establishedforlow-，medium-，andhigh-resistivityformations inoil-baseddrilingfluidenvironments.TakingtheMFITmultifrequencyoil-based electrical imaging logging tolasan example，，theefectivenessofthe proposed methodwas verified using datafromexperimentalwells.Theresultsshowthat this methodsignificantlyimproves imageclarityandenhances the tol'sabilitytoidentifywelloredetails.Furthermore，itcanbeappliedtoimagecorrectionforothertoolsofthesametype（suchas the Earth Imager） .

KeyWords：multi-frequency；oil-based electrical imaging；electric logging；stand-offcorrection；image processing

电缆电成像测井仪器极板上采用高密度阵列纽 扣电极排布，工作时通过机械臂张开推靠极板，使得纽扣电极贴靠在井壁上，监测纽扣电极上电流变化实现井壁的电性参数测量[1-4]。（剩余14168字）