Borehole geophysics and geology of well H-43, the Los Humeros geothermal field, Puebla, México

Abstract

This report is about the geology, seismic and electromagnetic surveys, drilling operations and borehole geophysical logging of well H-43, located within the Los Humeros geothermal field in Puebla, México. Data acquisition and preliminary interpretations from the drilling operation include the description of drill-cuttings, lithology, alteration and geophysical logging, including data from a Fullbore Formation MicroImager (FMI). Drilling operations were conducted by the Mexican company LATINA. Data acquisition was conducted by the Comision Federal de Electricidad (C.F.E.) and Schlumberger. Well H-43 was spudded on October 22nd, 2007 with drill rig IDECO 2 and was drilled down to a depth of 2200 m. Well operations were concluded on January 7th, 2008. The information was analyzed to identify possible fracture systems in the well in relation to the different rock units and feed zones. The interpretation of temperature data shows that well H-43 is a high-temperature well (maximum temperature recorded is 395.4°C). A petrographic analysis identified the well as being acidic, mostly observed in the rock formation. FMI and breakout parameters were interpreted ...