Applied chemistry in the exploration and development of New Zealand geothermal systems.

Abstract

Three case histories are discussed, each of which has contributed substantially, in economic terms, to the identification and development of geothermal energy reserves in New Zealand. These are: 1) the exploration of the Mokai geothermal field, 2) the resolution of problems of silica scaling in reinjection pipelines in the Ohaaki geothermal power project, and 3) the monitoring of changes within the exploited Wairakei field. The understanding of the chemical structure and chemical processes within active geothermal systems also provides guidance for exploration of fossil hydrothermal systems in the North Island of New Zealand, for gold and silver ore deposits. The economic value of these energy reserves and of overseas geothermal programmes are briefly reviewed in relation to expenditure on geothermal geochemical research.-A.W.H. Show more