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. The Los Humeros geothermal system is steam dominated andcurrently under exploration with 65 wells (23 producing). Havingtemperatures above 380  ∘ C, the system is characterized as a superhot geothermal system (SHGS). The development of such systems is stillchallenging due to the high temperatures and aggressive reservoir fluidswhich lead to corrosion and scaling problems. The geothermal system inAcoculco (Puebla, Mexico; so far only explored via two exploration wells) ischaracterized by temperatures of approximately 300  ∘ C at a depthof about 2 km. In both wells no geothermal fluids were found, even though awell-developed fracture network exists. Therefore, it is planned to developan enhanced geothermal system (EGS). For better reservoir understanding and prospective modeling, extensivegeological, geochemical, geophysical and technical investigations areperformed within the scope of the GEMex project. Outcrop analogue studieshave been carried out in order to identify the main fracture pattern,geometry and distribution of geological units in the area and tocharacterize all key units from the basement to the cap rock regardingpetro- and thermo-physical rock properties and mineralogy. Ongoinginvestigations aim to identify geological and structural heterogeneities ondifferent scales to enable a more reliable prediction of reservoirproperties. Beside geological investigations, physical properties of thereservoir fluids are determined to improve the understanding of thehydrochemical processes in the reservoir and the fluid-rock interactions,which affect the reservoir rock properties.

Outcrop analogue study to determine reservoir properties of the Los Humeros and Acoculco geothermal fields, Mexico