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Detailed3DgeologicalmodellingatacontaminatedstreamusingDC&TDSIP,geologicalandchemicaldata
IngeliseMøller1,PradipK.Maurya2,Gianluca Fiandaca2,NicolaBalbarini3,Vinni Rønde3,AndersJ.Kallesøe1,Knud ErikKlint4,AndersV.Christiansen2 &Poul L.Bjerg3
1GeologicalSurveyofDenmarkandGreenland,2AarhusUniversity,3TechinicalUniversityofDenmark&4GEO
NearSurfaceGeoscience‘17,Malmö,Sweden,3-7September
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
AcknowledgesmentsAdvancing GEOlogical,geophysicalandCONtaminantmonitoringtechnologiesforcontaminatedsiteinvestigation.
Researchinstitutions Industrypartners
FundingInnovationFundDenmark
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
Backgroundandmotivation• ThetownofGrindsted ismassively
influencedbycontaminantsdumpedbyapharmaceuticalfactoryinthetown.
• Investigationshaveshownthatcontaminantsfromthefactorysitedischargetothestream.
• Anupperandloweraquiferiscontaminatedwithdifferentchemicalcompounds.
• Detailedgroundwaterflowandtransportmodellingareneededtounraveltheflowpaths.
Þ Forthisadetailed3Dgeologicalmodelisrequired
80m
Chemicalfactory
Landfill
Grindstedtown
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
Dataavailablefor3Dgeologicalmodelling• Borehole data
– Lithological logs•
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
Dataavailablefor3Dgeologicalmodelling• Borehole data
– Lithological logs•Ø 3lith logsc.70mdeepØ +5lith logc.30mdeepØ +shorter
W SEN
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
Dataavailablefor3Dgeologicalmodelling
• Borehole data– Lithologicallogs•– Hydraulicheaddata– Electricalconductivityfromwater
samples
• Geophysicaldata– EMIsurveyusingDUALEM-421S– DCresistivity&TimedomainspectralIP
• 5melectrodespacing,3longprofiles• 5melectrodespacing,7profiles• 2melectrodespacing,7profiles
DatacollectionusingamodifiedABEMLSTerrameter ingradientarray.
•
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
Dataavailablefor3Dgeologicalmodelling• Borehole data
– Lithologicallogs•– Hydraulicheaddata– Electricalconductivityfromwater
samples
• Geophysicaldata– EMIsurveyusingDUALEM-421S– DCresistivity&TimedomainspectralIP
• 5melectrodespacing,3longprofiles• 5melectrodespacing,7profiles• 2melectrodespacing,7profiles
DatacollectionusingamodifiedABEMLSTerrameter ingradientarray.TDSIPdatain36log-spacedgatesin1ms-3.9s.
•
Processingaccording toOlssonetal.(2016)
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
Dataavailablefor3Dgeologicalmodelling• Borehole data
– Lithologicallogs•– Hydraulicheaddata– Electricalconductivityfromwater
samples
• Geophysicaldata– EMIsurveyusingDUALEM-421S– DCresistivity&TimedomainspectralIP
• 5melectrodespacing,3longprofiles• 5melectrodespacing,7profiles• 2melectrodespacing,7profiles
DatacollectionusingamodifiedABEMLSTerrameter ingradientarray.TDSIPdatain36log-spacedgatesin1ms-3.9s.InversionusingaCole-Colere-parameterisation,mBIC,afurtherdevelopmentofmMIC
•
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
The3Dgeological modelling challenge• Modellingclaylayersincontaminated
sedimentsusingDC&TDSIPdata– Whichparameterstouse:
Bulkelectricalconductivity,σbulkMaximumimaginaryconductivity,σ”max
Relaxationtime,τσFrequencyexponent,C
σbulk[mS/m]
σ bulk[m
S/m]
σ”max[m
S/m]
σ”max[mS/m] C []τσ [s]
τ[s]
C[]
Norm.cou
nt
Norm.cou
nt
Norm.cou
nt
Norm.cou
nt
0.3
0.0
0.20.1 10
0.0
0.1
10
0.01 1
0.0
0.0
0.2
0.50.01 1
0.01 1
0.01 1
0.01 1
0.1 1
0.1 1
0.1 1
0.1 1
0.01
1
0.01
1
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
The3Dgeological modelling challenge• Modellingclaylayersincontaminated
sedimentsusingDC&TDSIPdata– Whichparameterstouse:
Bulkelectricalconductivity,σbulkMaximumimaginaryconductivity,σ”max
Relaxationtime,τFrequencyexponent,C
σbulk[mS/m] σ”max[mS/m]
Norm.cou
nt
Norm.cou
nt
0.3
0.0
0.20.1 10
0.0
0.01 1
0.01 1
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
The3Dgeological modelling challenge• Modellingclaylayersincontaminated
sedimentsusingDC&TDSIPdata– Whichparameterstouse:
Bulkelectricalconductivity,σbulkMaximumimaginaryconductivity,σ”max
Relaxationtime,τFrequencyexponent,C
0.01 1
σbulk[mS/m] σ”max[mS/m]
Norm.cou
nt
Norm.cou
nt
0.3
0.0
0.1 0.01 1
0.2
0.0
10
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
The3Dgeological modelling challenge• Modellingclaylayersincontaminated
sedimentsusingDC&TDSIPdata– Whichparameterstouse:
Bulkelectricalconductivity,σbulkMaximumimaginaryconductivity,σ”max
Relaxationtime,τFrequencyexponent,CCalc.totalelectricalconductivity ,σ0
– ForgeologicalmodellingwepreferResistivity=1/σ0Bulkresistivity=1/σbulk
– Relationtolithology0.01 1
σbulk[mS/m] σ”max[mS/m]
Norm.cou
nt
Norm.cou
nt
0.3
0.0
0.1 10 0.01 1
0.2
0.0
σ0[mS/m]
Norm.cou
nt 0.3
0.0
0.1 10 0.1 10 0.01 1
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
The3Dgeological modelling challenge• Modellingclaylayersincontaminated
sedimentsusingDC&TDSIPdata– Whichparameterstouse:
Bulkelectricalconductivity,σbulkMaximumimaginaryconductivity,σ”max
Relaxationtime,τFrequencyexponent,CCalc.totalelectricalconductivity ,σ0
– ForgeologicalmodellingwepreferResistivity=1/σ0Bulkresistivity=1/σbulk
– RelationtolithologyResistivityvs.‘Chargeability’(σ”max)
– Pointoutcontaminated areas usingECfromwater samples
0.01 1
σbulk[mS/m] σ”max[mS/m]
Norm.cou
nt
Norm.cou
nt
0.3
0.0
0.1 10 0.01 1
0.2
0.0
σ0[mS/m]
Norm.cou
nt 0.3
0.0
0.1 10 0.1 10 0.01 1
Archie’s law:rf=F×rwaterF»5-6
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
The3Dgeological modelling challenge• Modellingclaylayersincontaminated
sedimentsusingDC&TDSIPdata– Whichparameterstouse:
Bulkelectricalconductivity,σbulkMaximumimaginaryconductivity,σ”max
Relaxationtime,τFrequencyexponent,CCalc.totalelectricalconductivity ,σ0
– ForgeologicalmodellingwepreferResistivity=1/σ0Bulkresistivity=1/σbulk
– RelationtolithologyResistivityvs.‘Chargeability’(σ”max)
– Pointoutcontaminated areas usingECfromwater samples
Bulkresistivity
Resistivity
Bulkresistivity
Resistivity
Line2,2melectrode spacingNW SE
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
The3Dgeological modelling challenge• Modellingclaylayersincontaminated
sedimentsusingDC&TDSIPdata– Combineinformationtomodelclay
layers
Bulkresistivity
Resistivity
Bulkresistivity
Resistivity
Chargeability
3Dgeological model
NW SELine2,2melectrode spacing
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
The3Dgeological modelling challenge• Modellingclaylayersincontaminated
sedimentsusingDC&TDSIPdata– Combineinformationtomodelclay
layers– Resolution
Bulkresistivity
Resistivity
3Dgeological model
Resistivity
Bulkresistivity
Chargeability
NW SELine4,2melectrode spacing
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
The3Dgeological modelling challenge• Modellingclaylayersincontaminated
sedimentsusingDC&TDSIPdata– Combineinformationtomodelclay
layers– Resolution
Bulkresistivity
Resistivity
Line6,5melectrode spacingBulkresistivity
Resistivity
Chargeability
3Dgeological model
W E
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
The3Dgeological model- results
Viewpoint
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
The3Dgeological model- results
Viewpoint
Mølleretal.:Detailed3Dgeologicalmodellingatacontaminatedstream …
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