Designation:D6726−15StandardGuideforConductingBoreholeGeophysicalLogging—ElectromagneticInduction1ThisstandardisissuedunderthefixeddesignationD6726;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisguideisfocusedonthegeneralproceduresneces-sarytoconductelectromagnetic-induction,induction,electromagnetic-conductivity,orelectromagnetic-resistivitylogging(hereafterreferredasinductionlogging)ofboreholes,wells,accesstubes,caissons,orshafts(hereafterreferredasboreholes)ascommonlyappliedtogeologic,engineering,groundwaterandenvironmental(hereafterreferredasgeotech-nical)explorations.Inductionloggingformineralsorpetro-leumapplicationsisexcluded.1.2Thisguidedefinesaninductionlogasarecordofformationelectricalconductivityorresistivitywithdepthasmeasuredbytheinductionmethodinaborehole.1.2.1Inductionlogsaretreatedquantitativelyandshouldbeinterpretedwithotherlogsanddatawheneverpossible.1.2.2Inductionlogsarecommonlyusedto:(1)delineatelithology;(2)evaluateformationwaterqualityandeffectiveporosity,and(3)correlatestratigraphybetweenboreholes.1.3Thisguideisrestrictedtoinductionmeasurementsthatareatafrequencyoflessthan50KHz;arenon-directional;andaverageformationpropertiesaroundthecircumferenceoftheborehole;whicharethemostcommoninductionmeasurementdevicesusedingeotechnicalapplications.1.4Thisguideprovidesanoverviewofinductionloggingincluding(1)generalprocedures;(2)specificdocumentation;(3)calibrationandstandardization;and(4)logqualityandinterpretation.1.5ToobtainadditionalinformationoninductionlogsseeReferencessectioninthisguide.1.6Thisguideoffersanorganizedcollectionofinformationoraseriesofoptionsanddoesnotrecommendaspecificcourseofaction.Thisguideshouldnotbeusedasasolecriterionforinductionlogginganddoesnotreplaceeducation,experience,andprofessionaljudgment.Induct...
