By Malcom Grant (Auth.)

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A pressure differential may be caused by the natural flow. 9 illustrates the initial pressure distribution in four New Zealand fields. The depth is measured from the mean elevation of surface discharge of water. At Wairakei and Kawerau, the pressure profile is smooth and extrapolates to atmospheric at the surface. No confining layer is apparent. Pressures deep in the reservoir are overpressured with respect to ground surface, but this overpressure is caused by the upflow PRESSURE MPa 5 10 ^—Ngawha Kawerau Fig.

The net mass and heat loss are the same as in the previous case. 6. 1. Introduction We have attained a good understanding of the processes that are likely to take place in any geothermal reservoir, and we have all the numerical and analytical tools that we are likely to need in analyzing and quantifying those processes. Obviously both our knowledge and our understanding of the processes will improve with time and experience, and our numerical and analytical techniques will improve and become more refined.

6. Developing a Conceptual Model of a Geothermal Reservoir 39 Once drilling is under way, much more data from wells and tests becomes available. This data must be collated into a convenient form that shows any patterns that may exist and any anomalies in the data that may need to be checked or explained. For visual purposes maps or graphs of various types are obviously the most convenient display form. Often, it is during the production of such maps that the first technically based conceptual models of the reservoir are developed.

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