ASTM_D_6726_-_15.pdf

Designation:D672615Standard Guide forConducting Borehole Geophysical LoggingElectromagnetic Induction1This standard is issued under the fixed designation D6726;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This guide is focused on the general procedures neces-sarytoconductelectromagnetic-induction,induction,electromagnetic-conductivity,or electromagnetic-resistivitylogging(hereafter referred as induction logging)of boreholes,wells,access tubes,caissons,or shafts(hereafter referred asboreholes)as commonly applied to geologic,engineering,groundwater and environmental(hereafter referred as geotech-nical)explorations.Induction logging for minerals or petro-leum applications is excluded.1.2 This guide defines an induction log as a record offormation electrical conductivity or resistivity with depth asmeasured by the induction method in a borehole.1.2.1 Induction logs are treated quantitatively and should beinterpreted with other logs and data whenever possible.1.2.2 Induction logs are commonly used to:(1)delineatelithology;(2)evaluate formation water quality and effectiveporosity,and(3)correlate stratigraphy between boreholes.1.3 This guide is restricted to induction measurements thatare at a frequency of less than 50 KHz;are non-directional;andaverage formation properties around the circumference of theborehole;which are the most common induction measurementdevices used in geotechnical applications.1.4 This guide provides an overview of induction loggingincluding(1)general procedures;(2)specific documentation;(3)calibration and standardization;and(4)log quality andinterpretation.1.5 To obtain additional information on induction logs seeReferences section in this guide.1.6 This guide offers an organized collection of informationor a series of options and does not recommend a specific courseof action.This guide should not be used as a sole criterion forinduction logging and does not replace education,experience,and professional judgment.Induction logging proceduresshould be adapted to meet the needs of a range of applicationsand stated in general terms so that flexibility or innovation arenot suppressed.Not all aspects of this guide may be applicablein all circumstances.This ASTM standard is not intended torepresent or replace the standard of care by which the adequacyof a given professional service must be judged withoutconsideration of a projects many unique aspects.The wordstandard in the title of this document means that the documenthas been approved through the ASTM consensus process.1.7 UnitsThe values stated in either inch-pound units orSI units given in brackets are to be regarded separately asstandard.The values stated in each system may not be exactequivalents;therefore,each system shall be use independentlyof the other.Combining values from the two systems mayresult in non-conformance with the standard.Add,ifappropriate,“Reporting of test results in units other than SIshall not be regarded as nonconformance with this standard.”1.8 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory requirements prior to use.2.Referenced Documents2.1 ASTM Standards:2D653 Terminology Relating to Soil,Rock,and ContainedFluidsD5088 Practice for Decontamination of Field EquipmentUsed at Waste SitesD5608 Practices for Decontamination of Field EquipmentUsed at Low Level Radioactive Waste SitesD5753 Guide for Planning and Conducting Borehole Geo-physical Logging3.Terminology3.1 Definitions:1This guide is under the jurisdiction ofASTM Committee D18 on Soil and Rockand is the direct responsibility of Subcommittee D18.01 on Surface and SubsurfaceCharacterization.Current edition approved Dec.1,2015.Published January 2016.Originallyapproved in 2001.Last previous edition approved in 2007 as D6727 01(2007).DOI:10.1520/D6726-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.1 For definitions of common technical terms in thisstandard,refer to Terminology D653.3.2 Definitions of Terms Specific to This Standard:3.2.1 depth of exploration,nin geophysics,the radialdistance from the measurement point to a point where thepredominant measured response may be considered centered(not to be confused with the depth below the surface).3.