By Malcom Grant (Auth.)
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Additional resources for Geothermal Reservoir Engineering
This recharge has been confirmed by repeated gravity surveys (Hunt, 1977). To date there has been little injection of water into Wairakei. The uniform nature of the pressure change across the Wairakei reservoir has influenced much of the disturbed reservoir modeling effort. , in lumped-parameter terms. In the early 1960s there was a consensus in New Zealand that the reservoir, under exploitation, contained boiling fluid in its upper parts. James (1965a) modeled the upper region as a layer of saturated steam overlying liquid.
Generally, once exploitation commences the subsurface flow pattern generated by the exploitation will totally overwhelm any natural flow pattern. Changes in reservoir temperatures will reflect changes in the reservoir as water boils or as colder water sweeps in. Such changes may not be easy to detect quickly, given the uncertainty in accurate determination of reservoir temperature. Note that there is no inference that recharge under exploitation enters the reservoir at its hottest point. Chemical Mapping The chemical content of the fluid is another quantity that may be determined readily, although sampling from specific locations within the reser- 2,6.
Summary In its natural state the basic components of the geothermal system, of which the reservoir is the hot, exploitable part, are (a) an aquifer or channel network containing hot fluid, (b) a path that cold water can flow down to maintain the throughflow, and (c) a source of heat. There may also be in some systems a cap or aquiclude over the aquifer or channel network, but this is by no means essential. Many systems have their current form because they lack such a capping structure. There may also be some recirculation of water from the upflow to the downflow region.
Geothermal Reservoir Engineering by Malcom Grant (Auth.)