The Cerro Prieto Geothermal Field is a liquid dominated geothermal system located 30 km southeast of Mexicali Baja, California, Mexico, in the Mexicali Valley. Although some wells were drilled and completed in the late 60%, it was April, 1973, when the geothermal power plant began operating with a capacity of 75 MW of electric power. Presently, the power plant installed capacity is 150 MW but this amount is expected to increase as further field development is planned to take place in the coming years. A number of questions are being presently asked as this field development continues. What will the deliverability of this geothermal field be in relation to planned installations? Will reinjection be required to supplement aquifer recharge? What will be the reservoir life and ultimate recovery? This concern has resulted in a joint project, where Comision Federal De Electricidad, Instituto De Investigaciones Electricas and INTERCOMP Resource Development and Engineering, Inc., of Houston, Texas are presently involved in performing reservoir simulation studies on the Cerro Prieto Field. An integral part of this project is the analysis of geophysical well logs to determine basic reservoir parameters. There are three primary sources of data on the petrophysical properties of a reservoir: core analysis, well tests and well logs. Core analysis data are limited because of the expenses involved in obtaining the core samples and perfor ming the analysis. Well test analysis provide reservoir properties averaged over a large volume and therefore is not detailed. Well log analysis then, is the prime means of obtaining detailed data from the reservoir. A distribution of material parameters can be obtained from this analysis and the reservoir can be better defined for simulation purposes.

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