三维侧向测井电极系设计及其响应模拟.pdf

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1、APPLIEDGEOPHYSICS，Vo1．11，No．2(June2014)，P_223-234，17Figures．DoI：10．1007／sll770．014．0439．z3DlaterologarraysondedesignandresponsesimulationYinCheng-Fang’，，KeShi-Zhen’，，XuWei’，，JiangMing’，，ZhangLei—Jie’·，andTaoJie’·Abstract：Anewthree．dimensionallaterologarraysonde(3D．LS、ispresented．The3D．LSisbasedonex

2、istinghigh．resolutionlaterologarrayandazimuthalresistivityimagingsondeswithradial，longitudinal，andcircumferentialdetectionabilities．Sixinvestigationmodesaredesignedusingthe3Dfinite．elementmethodanddifferentinvestigationdepthsaresimulatedbasedonthepseudo．geometricalfactorofthesixmodes．Theinvasionpro

3、fileisdescribedusingmulti．arayradiallogs．Fromtheanalysisofthepseudo-geometricalfactor,theinvestigationdepthofthe3D．LSisabout1．5mforconductiveinvasion．whichisclosetothatoftheduallaterologtoolbutgreaterthanthatofthehighlyintegratedazimuthallaterologsonde．Theverticalandazimuthalresolutionisalsoanalyrz

4、edwiththesamemethod．The3D．LScandetectlow．resistivityanomaliesof0．5mthicknessand15。aroundtheboreholeforinfinitelythickformations．Thisstudylaysthefoundationformoreworkon3Dlaterologarraysondeforevaluatinglow—resistivityanomalies．Keywords：Three．dimensiona1laterolog，sonde，numericalmodeling，FEM，detectivi

5、ty,low—resistivitylntroductionft，whichishalfofthelengthoftheDLTarrays(Smits，1995)．InHALS．theazimuthalelectrodesarearoundthemainelectrode．whichissplitintotwosections．TheresistivitymeasuredbytheARIandHALSinstrumentsTheazimuthalresistivityimagerfARI)(Davies。isdirectionalatshallowdepthofinvestigationrD

6、OI1．l994)．thehighlyintegratedazimuthallaterologTheapparentresistivitiesofdifferentradialresponsessonde(HALS)(Smits．1995)．andthehigh—resolutionlaterologarraytool(HRLT)areinstrumentsdesignedbyarecollectedwiththeHRLT(Smits。1998)electrodesatvariousspacings．SoftwarefocusingistomakedeepSchlumbergerbasedo

7、ntheirduallaterologtool(DLT)investigationuDtO2．2mwhilethetoolcannotprovide(Suau．1972；Scholberg．1973)．ARIhastwelveazimuthelectrodesandisincorporatedintheduallaterologsondetheazimuthalinformation．In1998．thehi