Towards Visualization of the Structural Setting in the Los Humeros Geothermal Field Using Gravity
Natalia CORNEJO, Eva SCHILL, Sebastian HELD, Domenico LIOTTA, Andreas BROGI, Luigi PICCARDI, Marco PEREZ, Jonathan CARRILLO, Ingo SASS
[Karlsruhe Institute of Technology - KIT, Germany]
The GEMex project addresses different challenges in the development of Enhanced Geothermal Systems (EGS) and Superhot Geothermal Systems (SHGS) in the Trans-Mexican Volcanic Belt. Although being located in similar tectonic settings, the geothermal conditions in Acoculco and Los Humeros differ strongly resulting in an EGS and a SHGS, respectively. The Los Humeros field is currently under conventional exploitation. North of the current production area, higher temperatures more than 380 °C are expected. The Acoculco site presents temperatures more than 300 °C at a depth of 2 km, but a reservoir is not identified. The main goal of this work is to visualize and characterize the reservoir conditions using gravity data. To accomplish this, we measured and processed a total of 344 gravity stations in Los Humeros and 84 stations in Acoculco at a local scale. In Los Humeros, the Bouguer anomaly shows a clear trend of decreasing gravity from the NE to the SW, fitting with the Bouguer anomaly of the regional gravity data, where a minimum gravity anomaly was found in the center of the caldera. At the reservoir level in Acoculco, an area of high-density anomaly coincides with an area of low permeability, revealed by the absence of water reservoir at depth were two not productive exploration wells were drilled (Peiffer et al. 2014b).
|        Topic: Geophysics||Paper Number: 13066|