An estimate of the resource potential of New Zealand geothermal fields for power generation
1978; Elsevier BV; Volume: 7; Issue: 2-4 Linguagem: Inglês
10.1016/0375-6505(78)90014-7
ISSN1879-3576
AutoresIan G. Donaldson, Malcolm A. Grant,
Tópico(s)Geophysical and Geoelectrical Methods
ResumoThe basic similarity between most of the New Zealand geothermal fields suggests that the exploited fields of Wairakei and Broadlands can be used as indicators of the potential of other fields as resources for steam for power production. Assuming adequate permeability will be obtained in fields yet to be tested, the two parameters controlling this potential are areal extent (as defined by resistivity survey) and temperature at depth. As most field temperatures are bracketed by Wairakei (270°C maximum) and Broadlands (310°C maximum), field potential per unit area should also be bracketed by the field potentials per unit area of these two fields, i.e. Wairakei at 10–11 MWe/km2 and Broadlands at 13–14 MWe/km2. Based upon our present knowledge of the fields in question we may thus assess their proven, inferred and speculative reserves. Our totals for all fields of 450 MWe proven, 750 MWe inferred and 1300 MWe speculative suggests that New Zealand has some 1300–2500 MWe available from its geothermal resources should it desire to exploit these for electrical power. These figures can only be confirmed and improved by drilling and ultimately by exploitation. The most promising tool for a full assessment of a field potential, the reservoir model, can only really be set up once the field has been exploited sufficiently to have been disturbed. In future cases this may only be the case once a power station has been established and has been operating for some time.
Referência(s)