Mini Res by Rob Turner, Bridget Bliss, Scott Briscoe
Outline • Methods • Locations • Characteristic curves • Cumulative resistivity inversion • Typical fault signature • Results
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.
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.
Typical fault signature Gouge Zone Strike slip fault
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
Conclusions • The data do not conclusively prove or disprove the presence of a fault • Data integration is the key to accurately analyzing this data