Basement structure, lithology and permeability at Kawerau and Ohaaki geothermal fields, New Zealand

摘要

Poorly permeable basement rocks commonly occur in geothermal regions around the world, and the Quaternary Taupo Volcanic Zone (TVZ) of New Zealand is no exception. Production form basement terrane requires detailed knowledge of its geological and geophy- Sical parameters, as show by the history of Kawerau and Ohaaki, the only geothermal fields In the TVZ where Mesozoic Torless terrane greywakce (litharenite) basement is commonly Pentrated at drilled depths of 1-2.5 km.