Mini Res

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Mini Res

• by
• Rob Turner, Bridget Bliss, Scott Briscoe

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Outline

• Methods
• Locations
• Characteristic curves
• Cumulative resistivity inversion
• Typical fault signature
• Results

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Methods

• 2 Primary methods
• Schlumberger
• Wenner
• Differences- Schlumberger you only have to move
  the voltmeter electrodes as opposed to moving all
  4. The Wenner method is the most time consuming
  but yields the best data. In this method you
  move all 4 posts.
• We used the Wenner method.

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Fernley Locations
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Hazen Location
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Wenner Method
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Characteristic curves

• We created characteristic curves for the Hazen
  area and the Fernley area.
• The curves can be matched to the Schlumberger
  two-layer type curves to determine the relative
  resistivity of the lower layers compared to the
  upper layers.

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Fernley Characteristic Curves
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Hazen Characteristic Curves
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Schlumberger Two-layer Type Curves
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Fernley Inversion
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Hazen Inversion
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Typical fault signature
Gouge Zone
Strike slip fault
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Results

• Apparent resistivities obtained in this study are
  indicative of clays (1-100 ohm-m) or sands
  (1-1000 ohm-m)
• The Fernley data are more indicative of sands
• The Hazen data are more indicative of clays
• Anomalies may indicate groundwater, sedimentary
  structures or disturbed zones

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Conclusions

• The data do not conclusively prove or disprove
  the presence of a fault
• Data integration is the key to accurately
  analyzing this data