First Approach to 3D Resistive Model Interpretation in the Geothermal Area of Paipa, Colombia

Abstract

The geothermal area of Paipa is located in the northwest of Colombia, on the Eastern Cordillera. On this geothermal area the distribution of the electrical resistivity was estimated from 3D modeling of 88 magnetotelluric soundings with the WSINV3DMT algorithm. The joint inversion of the off-diagonal of the impedance tensor (Zxy and Zyx) and the tipper was carried out. 3D model show a deep resistive anomaly associated with the crystalline basement of the Floresta Massif and above it a layer of intermediate resistivity that suggests a thicker sedimentary cover to the NW, without an obvious resistive distinction between the formations comprising it. In turn, several conductive anomalies are shown near the surface, to the NW of the models, forming apparent conduits from south to north, possibly associated with leachates from evaporite deposits. While SE of the models, resistive anomalies associated with the domes of Alto Los Godos and Alto Los Volcanes and probable intrusions without surface expression to the NW, were observed. Intermediate reistivity zone between the domes of the Alto Los Volcanes and Alto Los Godos, where the location of a possible geothermal reservoir is estimated.