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Mini Res

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Mini Res

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  1. Mini Res by Rob Turner, Bridget Bliss, Scott Briscoe

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

  3. 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.

  4. Fernley Locations

  5. Hazen Location

  6. Wenner Method

  7. 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.

  8. Fernley Characteristic Curves

  9. Hazen Characteristic Curves

  10. Schlumberger Two-layer Type Curves

  11. Fernley Inversion

  12. Hazen Inversion

  13. Typical fault signature Gouge Zone Strike slip fault

  14. 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

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