Update to the Conceputal Geologic Model of the Borinquen Geothermal Field, Costa Rica

Abstract

From October 18, 2016 to December 14, 2018 three deep directional boreholes have been drilled from wellpad PLB-09 located in the northwest sector of the Borinquen Geothermal Field (BGF) in Costa Rica. Previously, four other deep wells had been drilled in this field (two vertical and two deviated) as well as 28 temperature gradient wells. Prior to drilling from pad PLB-09, the geologic, stratigraphic, structural, high temperature alteration mineralogy, hydrogeochemistry, geophysical, and isotope information available from those boreholes and previous field work was compiled by Molina and Martí and published in Geothermics in 2016 where a thermal anomaly is shown within the Cañas Dulces Caldera. This paper shall provide newly obtained information form these three new boreholes in comparison with the already published data to update the existing Conceptual Geologic Model of the Borinquen Geothermal Field.