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Resource Assessments 133

7.4 Chemical processes can result in limestone being replaced by quartz. Write the chemi-
cal reaction that would represent this process. If 40 vol.% of a limestone were replaced
by quartz, how would that affect the heat content of the limestone?
7.5 In Figure 7.5 it is demonstrated that fluid flow is often accommodated by only a frac-
tion of the total available permeable volume. Discuss the factors that account for this
observation. When exploring for a geothermal resource in fractured rock, what char-
acteristics would you consider favorable for supporting sufficient flow?
7.6 What are the geological processes that have resulted in the concentration of potentially
favorable geothermal sites in California, Colorado, New Mexico, Oregon, and Idaho
(Figure 7.6)? If you were to undertake a reconnaissance exploration effort, what spe-
cific area would you target and why?
7.7 What combination of factors would give the highest probability of being able to develop
an 8 MW facility?

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