Applications of Geothermal Well LOG Data for Evaluation of Reservoir Potential

摘要

A great many geothermal reservoirs are naturally fractured stems with porosity supplied by both the macroscopic fracture system and by dispersed intergranular or vuggy porosity. Flow properties, the use of log data for well test interpretation in such systems, and the log derivable parameters that may be of most value for evaluation are discussed here. Parameters for describing behavior of two-phase geothermal systems are also mentioned. Determination of reservoir dimensions is another important problem aggravated in geothermal resource evaluation by our limited knowledge of the geophysics of geothermal systems. The use of resistivity log data to deduce constraints on the inversion of surface resistivity data is examined. Potentially valuable applications of resistivity log data in deducing reservoir dimensions and reaching decisions on exploratory drilling are indicated. (ERA citation 06:018502)