Geophysics for geothermal exploration. Directional-derivatives-based computational filters applied to geomagnetic data at lake Cuitzeo, Mexico

espanolPara el desarrollo de un campo geotermico, el conocimiento de la distribucion de fracturas, la hidrologia y la evolucion tectonica del sitio a traves de la caracterizacion estructural del sistema natural es un requisito previo a la perforacion de pozos exploratorios. Fallas y fracturas representan vias preferenciales por el flujo de fluidos en el subsuelo y pueden ser detectadas mediante investigaciones geologicas en la superficie y geofisicas en el subsuelo. Una anomalia magnetica positiva y de forma sub-circular en planta se encuentra en el medio del lago Cuitzeo, Mexico. A traves de un levantamiento geomagnetico dentro y alrededor del area que comprende la anomalia tratamos caracterizar el reservorio geotermico que, al sur del lago, esta notificado por manifestaciones hidrotermales. Utilizando filtros computacionales basados sobre el uso de operaciones con las derivadas de valores de campo a los datos magneticos grabados, hemos puesto en luz algunas de las estructuras que influencian la circulacion de los fluidos en el sistema geotermal. Nuestra atencion se focalizo sobre fallas ~N-S and E-W, pertenecientes respectivamente a la tectonica Basin & Range (B&R) y a la del Cinturon Volcanico Mexicano (CVM). Segun nuestra interpretacion, la interaccion de dos o mas estructuras de diferentes origenes (B&R y CVM), ademas del entorno geodinamico especifico (subduccion de zona de fracturas), facilito el surgimiento de cuerpos magmaticos basicos del profundo que, bloqueados por la capa argilosa de sedimentacion lacustre del Cuitzeo, dieron lugar, enfriandose lentamente, al sistema geotermal y contribuyeron a la formacion de la anomalia magnetica. EnglishFor the development of a geothermal field, the understanding of fracture distribution, hydrology and tectonic evolution of the site through structural characterization of the natural system is a prerequisite to the drilling of exploratory wells. In order to image the underground shape of approximately planar, relatively permeable, geologic features (fractured rock-volumes around fault planes) and to detect hot rock volumes, geologic and geophysical surveying is carried out. A strong positive magnetic anomaly, nearly circular in 2D, characterizes the middle of Cuitzeo lake, Michoacan, Mexico, apparently not related with a volcanic structure on the surface. It may instead be associated to the geothermal system in the area which yields at present hot springs at the southern shore of the lake, at boiling temperatures. In this study, we conducted a ground magnetic survey within and around Lake Cuitzeo with the aim of characterizing this anomaly, following one-kilometer-spaced survey-lines and covering an area of approximately 100 km2. To enhance interpretability, we applied computational filters based on directional derivatives (vertical and horizontal) to our reduced-to-pole magnetic-field raw data – illuminating underground faults and other permeable pathways for fluids and delineating contacts between differently magnetized rocks, through maxima and minima on maps. While most filters used were able to define the basic configuration of the system, we found that computational filters working with ratios of derivatives (vertical and horizontal) were able to better account for the depth of a magnetic source. Also, faults were more clearly imaged on maps. We could mainly highlight ~E-W and ~N-S striking fault-systems, respectively belonging to the ~N-S TransMexican Volcanic Belt extensional tectonics and to the ~E-W Basin & Range, both with lateral movements and still active today. We interpret the magnetic source as a magma body (related to the volcanism of Michoacan-Guanajuato Volcanic Field) that remained trapped during its ascent under Cuitzeo lacustrine sedimentation, during the last 500 ka, forming the once stronger geothermal system.