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1、ABSTRACTBoreholeinducedpolarizationmethod(referredtoastheboreholeinducedpolarization)cantakeadvantageofthedrillingclosedetectionnexttothewellthebottomholeblindmine,comparedwiththegroundinducedpolarizationinexplorationdepthexplorationdeeporebodydeepertomakeupgroundinducedpol
2、arizationmethoddeficiencies.Theinversionmethodbyinsufficientdatalimitations,itisdifficulttomeettheprecisedetectionandcomputerautomaticinversionandimaging.Tothisend,awellsuitableforautomaticinversionimagingexcitationpolarizationobservationandforwardmodelingandinversionsystem
3、-welllandintensivearrayexcitationpolarizationjointobservationmethod,thismethodcanimprovetheapplicabilityofboreholeinducedpolarizationmethod,butalsoimprovesthedetectionaccuracyoftheorebodynexttothewell.Intheaspectof3Dborehole-groundforwardmodeling.Tointroduce3Dborehole-groun
4、dinducedpolarizationmethodnumericalsimulationalgorithmtheory.Three-dimensionalsimulationareausingradialnon-uniformsubdivisionofdiscrete,wellhead-centered,equidistantfromthesplitinthediameterdirection,splitintoeightaliquotsuniformangleof45°inthedirectionoftheringdrilling,tom
5、akesplitmethodmoreinlinewiththelawsofthewellfielddistribution,correspondingwiththissplit,wedesignfourradialsurveycenteringonthewellheadobservationdevice,effectivelysolvethecaseofthewellunknownlocationgeologicalbodyisdifficulttodetermineobservationsdirection.Weusingradiallys
6、plitthefiniteelementmethodnumericalsimulation,andthepreparationofthecorrespondingforwardsimulationprogram,webuildseveraltypicalgeologicmodelforfiniteelementsimulationtotestthereliabilityofthealgorithmandtheprogram,andunderdifferentcircumstancesabnormalresponsewereanalyzed.I
7、ntheaspectof3Dborehole-groundinversionimaging.Firstofall,thebasicprinciplesandmethodsofinversionareintroduced;Second,Weusingtheabnormalpotentialoffiniteelementmodelingmethodtocalculate,andonthisbasistoderivethepartialderivativematrix;Third,inordertoeffectivelyimprovetheaccu
8、racyoftheinversion,reducinginversionofmultiplesolutions,thesmoothnessconstraintasa