Glass Mountain Geophysics Case History

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Glass Mountain GeophysicsCase History
by William Cumming Cumming Geoscience, Santa Rosa
CA wcumming_at_wcumming.com
Cumming Geoscience, 2006
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Glass Mountain Geophysical Surveys
MT 170 stations used in 3D of gt300
acquired TDEM 440 stations integrated from gt600
acquired Gravity gt530 stations integrated of gt900
acquired TGH 24 temperature holes, 3 slim holes
and 2 wells constrained exploration VES 61
stations not used because non-linear layout not
fully compensated so results are
misleading MEQ Microearthquake (passive seismic)
survey detected few events. HEM Detected two
areas of very shallow low resistivity DIL
log Wireline induction resistivity log provides
correlation for MT
Cumming Geoscience
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Glass Mountain Geothermal Field
Cumming Geoscience
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Glass Mountain Geothermal Field Dangerous Access
on Lava Flow
Cumming Geoscience
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Glass Mountain Geothermal Field TDEM Stations
Cumming Geoscience
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Glass Mountain Geothermal FieldData Used to
Target Well 88A-28
Cumming Geoscience
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Glass Mountain Geothermal Field TDEM Conductance
to 300 m
Cumming Geoscience
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Glass Mountain Geothermal Field TDEM Conductance
to ? 600 m ?
Cumming Geoscience
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Glass Mountain Geothermal Field MT Stations
Cumming Geoscience
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Glass Mountain Geothermal Field MT Conductance to
600 m
Cumming Geoscience
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Glass Mountain Geothermal Field TDEM Conductance
to ? 600 m ?
Cumming Geoscience
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Glass Mountain Geothermal Field MT Conductance to
600 m
Cumming Geoscience
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Glass Mountain Geothermal Field TDEM Correction
of MT Statics

• Two TDEM stations at same MT station n083
• TDEM n083 100 m loop, TDEM R15 300 m loop
• Different static correction indicated

• TDEM n083 unrealistic shift to low resistivity
• TDEM unrealistic over shallow thick resistive
  rocks like lavas but it still looks usable

Cumming Geoscience
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Glass Mountain Geothermal Field MT Data Quality
Cumming Geoscience
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Glass Mountain Geothermal FieldMT
Cross-sectionMT Resistivity with isotherms from
Wells
Cumming Geoscience
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Glass Mountain Geothermal FieldMT Resistivity
and Well 17A-6
Cumming Geoscience
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Glass Mountain Geothermal FieldMT
Cross-sectionMT Resistivity with isotherms from
Wells
Cumming Geoscience
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Glass Mountain Geothermal FieldMT
Cross-sectionMT Resistivity with isotherms from
Wells
Cumming Geoscience
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Glass Mountain Geothermal FieldAudit Geophysics
Using Wells
Cumming Geoscience
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Glass Mountain Geothermal FieldMT
Cross-sectionMT Resistivity with isotherms from
Wells
Cumming Geoscience
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Glass Mountain Geothermal FieldMT Resistivity at
1700 m asl
Cumming Geoscience
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Glass Mountain Geothermal FieldMT
Cross-sectionMT Resistivity with isotherms from
Wells
Cumming Geoscience
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Glass Mountain Geothermal FieldMT Resistivity at
1600 m asl
Cumming Geoscience
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Glass Mountain Geothermal FieldMT
Cross-sectionMT Resistivity with isotherms from
Wells
Cumming Geoscience
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Glass Mountain Geothermal FieldMT Resistivity at
1000 m asl
Cumming Geoscience
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Glass Mountain Geothermal FieldMT
Cross-sectionMT Resistivity with isotherms from
Wells
Cumming Geoscience
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Glass Mountain Geothermal FieldGravity and MT
Resistivity at 1000 m asl
Cumming Geoscience
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Glass Mountain Geothermal FieldGravity with
Topography
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Glass Mountain Geothermal FieldMT
Cross-sectionMT Resistivity with isotherms from
Wells
Cumming Geoscience
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Glass Mountain Geothermal FieldMT Resistivity at
0 m asl
Cumming Geoscience
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Glass Mountain Geothermal FieldMT
Cross-sectionMT Resistivity with isotherms from
Wells
Cumming Geoscience
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Glass Mountain Geothermal Field3D MT Elevation
of Base of Low Resistivity Zone
Cumming Geoscience
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Glass Mountain Geothermal Field1D MT Elevation
of Base of Low Resistivity Zone
Cumming Geoscience
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Glass Mountain Geothermal Field
Cumming Geoscience
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Glass Mountain Geothermal Field1D MT Elevation
of Base of Low Resistivity Zone
Cumming Geoscience
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Glass Mountain Geothermal FieldMT
Cross-sectionMT Resistivity with isotherms from
Wells
Cumming Geoscience
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Glass Mountain Geothermal FieldConceptual Model
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Glass Mountain Geothermal FieldAudit Geophysics
Using Wells
Cumming Geoscience
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Glass Mountain Geothermal FieldPoster
Presentation GRC 2007
Cumming Geoscience
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Glass Mountain GeophysicsCase History
by William Cumming Cumming Geoscience, Santa Rosa
CA wcumming_at_wcumming.com
Cumming Geoscience, 2006