A discussion is presented of the material contained in Reference 1. This reference presents the results of an investigation of the fluid flow associated with pressure depletion in those geothermal reservoirs which are similar to oil and gas reservoirs. Geothermal reservoirs are often classified as either steam or hot water according to state of reservoir brine. These classification simply the presence of only one phase; however, it is recognized that both liquid and vapor phases may be present initially or may develop as the pressure declines. This condition may involve the simultaneous flow of steam and hot water. For two phase flow of steam and hot water the assumptions of small temperature and pressure gradients within the reservoir allow the simplification of the equations of heat and fluid flow.This leads to a relation between the fluid pressure and the liquid saturation. Similar assumptions for single phase flow lead to an approximately constant reservoir temperature with fluid pressure decline.

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