Electrical resistivity survey of the Wairakei geothermal field

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Risk, G.F.; Rayner, H.H.; Stagpoole, V.M.; Graham, D.J.; Dawson, G.B.; Bennie, S.L. 1984 Electrical resistivity survey of the Wairakei geothermal field. [s.l.]: [s.n.]. Report / Geophysics Division 200 69 p

Abstract: The results of three resistivity surveys of the Wairakei geothermal field are presented. Two of the surveys were made using the Schlumberger electrode array with AB/2 spacings of 500 m and 1000 m, and the third employed the multiple source bipole-dipole technique with a current transmitter placed in high resistivity ground about 6 km north of the field. From the measurements, a resistivity boundary zone defining the lateral transition from low (5 to 10 ohm m) to high (> 100 ohm m) resistivity rock at about 0.5 to 1 km depth has been inferred. In the area of about 25 sq. km, enclosed by the boundary zone, temperatures above 150 deg C exist in all the holes penetrating deeper than 700 m. Resistivities in the eastern and northern corners of the field are lower than the average within the field, but have not yet been investigated by deep drillholes