virgin river dcip report - university of british columbia · 2011. 1. 26. · virgin river dcip...

Data AcquisitionInversion

InterpretationDiscussion

Virgin River DCIP Report

Justin Granek1

1University of British Columbia

Geophysical Inversion Facility

Applied Geophysics, 2010

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Outline

1 Data AcquisitionLocationSurvey Specications

2 InversionData ErrorsDCIP2DDCIP3D

3 InterpretationCorrelationsSnowbird Tectonic Zone

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

LocationSurvey Specs

Outline

1 Data AcquisitionLocationSurvey Specications

2 InversionData ErrorsDCIP2DDCIP3D

3 InterpretationCorrelationsSnowbird Tectonic Zone

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

LocationSurvey Specs

RegionalAthabasca Basin, Northern Saskatchewan

Northern Saskatchewan

South Central Athabasca Basin

NTS Reference 74 G/12

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

LocationSurvey Specs

LocalWide Lake Grid

10 Lines runningNW-SE

Approximately 4kmlong each

Approximately 40line-km total

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

LocationSurvey Specs

Outline

1 Data AcquisitionLocationSurvey Specications

2 InversionData ErrorsDCIP2DDCIP3D

3 InterpretationCorrelationsSnowbird Tectonic Zone

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

LocationSurvey Specs

Electrode CongurationPole-Pole

Collected in Summer 2007-2008 by Patterson Geophysics Ltd.

Pole Spacing a = 150m

12 Stainless Steel Electrodes (Including Innites)

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

LocationSurvey Specs

Electrode CongurationCurrent Advance Protocol

For Electrodes n=1:6

Advance in Increments of 75m

For Electrodes n=7:10

Advance in Increments of 150m

Data Collected at Current-Potential Electrode Spacings of...

75m, 150m, 225m, 300m, 375m, 450m, 525m, 600m, 675m, 750m,825m, 900m, 1050m, 1200m, 1350m, and 1500m.

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

LocationSurvey Specs

HardwareInstrument Specications

Walcer TX9000 9.0 kW IP Transmitter

Walcer MG-12 Motor Generator

Two IRIS Instruments ELREC Pro Time DomainIP-Resistivity Receivers

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

LocationSurvey Specs

DataFiles Provided to UBC-GIF

RES2DINV File (.dat)

Reduced data format for RES2DINV software

Excel Spreadsheet (.xls)

File containing most of the raw data:

Voltage (mV)

Current (A)

Self Potential (mV/V)

20 Chargeability Channels (mV/V)

Local Tx/Rx Electrode Coordinates

Reduced Excel Spreadsheet (.xls)

Reduced data format for plotting pseudo-sections from Excel

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

LocationSurvey Specs

DataQuality

Duplicates

Data are mostly duplicated

Typically very similar

IP Data

Very noisy

Not very useful

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

Outline

1 Data AcquisitionLocationSurvey Specications

2 InversionData ErrorsDCIP2DDCIP3D

3 InterpretationCorrelationsSnowbird Tectonic Zone

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

Errors

Noise oor + 5% of each Datum

2D: Noise oor calculated as 90% of smallest value along line

3D: Noise oor calculated as 90% of smallest value

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

Outline

1 Data AcquisitionLocationSurvey Specications

2 InversionData ErrorsDCIP2DDCIP3D

3 InterpretationCorrelationsSnowbird Tectonic Zone

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

Survey Lines

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

Local Grid: Default ParametersData

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

Local Grid: Default ParametersInversion Results

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

Local Grid: Default ParametersInversion Results

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

UTM: Fine MeshData

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

UTM: Fine MeshInversion Results

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

Outline

1 Data AcquisitionLocationSurvey Specications

2 InversionData ErrorsDCIP2DDCIP3D

3 InterpretationCorrelationsSnowbird Tectonic Zone

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

UTM: Default ParametersInversion Parameters

Data 3582

Mesh 175 712 cells

Core Cell Size 75m×75m×37.5m

Reference Model 1000Ωm

Mist 4059

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

UTM: Default ParametersVertical Slice through Line 1200N

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

UTM: Default ParametersSurface View

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

UTM: Default Parameters375m Depth Slice

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

UTM: Default Parameters750m Depth Slice

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

UTM: Default ParametersResistivity Cuto of 300Ωm

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

ProblemsTopics worth Revisiting

Duplicated Data

IP Chargeability

Noisy Surface

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

Duplicated DataComparison at 600m Depth Slice

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

IP ChargeabilityDecay Curves

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

IP ChargeabilityInversion

Datum 554

Mesh 165 528 cells

Core Cell Size 75m×75m×37.5m

Mist 2539

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

IP Chargeability600m Depth Slice: Useful...?

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

Surface WeightingSurface View

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

Surface WeightingVertical Slice through Line 1200N

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

Surface Weighting375m Depth Slice

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

Data ErrorsDCIP2DDCIP3D

Surface Weighting750m Depth Slice

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

CorrelationsSnowbird Tectonic Zone

Outline

1 Data AcquisitionLocationSurvey Specications

2 InversionData ErrorsDCIP2DDCIP3D

3 InterpretationCorrelationsSnowbird Tectonic Zone

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

CorrelationsSnowbird Tectonic Zone

ZTEMRecall From Elliott's Presentation...

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

CorrelationsSnowbird Tectonic Zone

Outline

1 Data AcquisitionLocationSurvey Specications

2 InversionData ErrorsDCIP2DDCIP3D

3 InterpretationCorrelationsSnowbird Tectonic Zone

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

CorrelationsSnowbird Tectonic Zone

Snowbird Tectonic ZoneGraphitic Fault Oset

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

CorrelationsSnowbird Tectonic Zone

Snowbird Tectonic ZoneGraphitic Fault Oset

Justin Granek DCIP Report

Data AcquisitionInversion

InterpretationDiscussion

DiscussionFeedback, Questions & Opinions

What Do You Think?

Justin Granek DCIP Report