This chapter summarizes geological, geophysical, and geochemical studies of the Los Humeros thermal area and results to date of seven deep wells that confirm the zone´s prospects as a commercial geothermal reservoir.
The Los Humeros area covers approximately 225 km2 of eastern Puebla and western Veracruz States between 97°23´ to 97°31´W and 19°35´ to 19°45´N. Major towns in the vicinity are Altotonga (Veracruz) and TeziutlÃ¡n (Puebla) in the north, Zacatepec (Puebla) in the south, and Perote (Veracruz) in the southeast. The Veracruz State capital of Jalapa lies 53 km to the southeast (Fig. 1).
Access to the area is by a paved road network connecting the region´s main towns. Los Humeros is connected to Perote by an all-weather dirt road (paved at intervals) 32 km long. The principal access to Mexico City is Federal Highway 140 linking the town of Perote with Mexico City, Jalapa, and Veracruz. The Mexico-Perote-Jalapa-Veracruz and Mexico-Apizaco-Oriental- Teziutlán railroads crisscross the area. There is a small-plane airstrip at Jalapa.
The region has been covered by reconnaissance and detailed geological, petrographic, geophysical, geochemical, and geohydrological surveys, well-drilling and evaluation, and a preliminary modeling of the field.
Numerous internal reports by the Los Humeros Drilling Residence and the Exploration, Drilling, and Reservoir Evaluation Departments of the CFE (ComisiÃ³n Federal de Electricidad) Geothermoelectric Projects Management are available.
Figures & Tables
This volume was developed, produced, and privately printed in Mexico, in Spanish, by the late Ing. G.P. Salas in 1988, as a Mexican contribution to the Geology of North America, with the understanding that it would be translated into English for inclusion in the set. The translation is by Dr. Cecily Petzall of Caracas, Venezuela, with considerable figure translation and redrafting provided by GSA. Salas worked on the volume until his death, with much valuable help from Ing. Hugo Cortez Guzmán. The result is a valuable English-language synthesis of the information available to Salas in the early to mid-1980s about the geothermal, coal, and metal-mining sectors (and some non-metallic resources) of the economic geology of Mexico.