Primary porosity and permeability are some of the physics characteristics which seem are scarce in geothermal reservoirs, due to its volcanic nature, influencing in conditions reduction for communication between wellbore and the reservoir. Under this circumstance, one of the fluid flow ways between the reservoir and the wellbore is through permeability caused by fissures between blocks rock of the geological structures. These communication intervals with reservoir had been found non-continuous in majority of geothermal fields due to heterogeneity of rock formation. Besides sometimes not all of these communicated intervals with the reservoir provide geothermal fluid with thermodynamic characteristics, only represent permeability, but do not a feed zone. In this work are shown analysis of temperature and pressure profiles from measurements taken at similar conditions of repose times, in wells grouped in a geological structural block in Los Humeros Mexican geothermal field. The analysis carried out was designed taken into account abnormal behaviors of both thermodynamic parameters, correlated with respective gradients and with lithological formation of each well. Methodology applied in such analysis allows identify communicated intervals in the well with the reservoir, besides through correlation it was possible se1ect which intervals are acting as feed zone. Practical application for identification communicated intervals type with the reservoir is focused for selecting, in case of producer wells, the characteristics of production liners (slotted or smooth). By other hand, if there are not production characteristics, could be choosing for adapting it, for reinjection.

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