Author(s): Juvenal Antonio Letelier

Linked Author(s):

Keywords: Reservoir engineering

Abstract: In this work, I present a new conceptual model for the reservoir architecture of the El Tatio-La Torta geothermal system in northern Chile. Using the recent structural model for the chilean altiplano, we propose a complex and large reservoir system below El Tatio and La Torta, composed of a three-level reservoir system at different temperatures, connected by the intersection of NW-striking left-lateral and N-striking thrust faults. Furthermore, I give a physical explanation of the mechanisms controlling the upflow below La Torta, the possible location of the main catchment area at the Tocorpuri basin/caldera, located 15 km to 20 km to the east from the El Tatio geysers, and an explanation for the apparent hydraulic disconnection at El Tatio observed by pressure interference tests, which is coherent with the proposed structural setting for the geothermal field. This model offers an up-to-date representation of fluid circulation and heat transfer modes at different scales for this geothermal system in the Central Andes, illustrating potential problems related to hypothetical geothermal operations and groundwater management in the most wonderful geothermal field in South America.

DOI: https://doi.org/10.3850/IAHR-39WC2521711920221157

Year: 2022