INTEGRASI DATA GEOSAINS DALAM MENGANALISIS LAPANGAN PANAS BUMI PEGUNUNGAN MINERAL, UTAH

Abstract

This research was carried out in the Mineral Mountains, Utah, more precisely in the central part of the Mineral Mountains where geothermal manifestations in the form of hot springs, cold springs and fumaroles were found. This research aims to analyze the characteristics of the geothermal system in the Mineral Mountains based on surface and subsurface geological information as well as the characteristics of its reservoir. The research was carried out using fluid chemistry data from well and manifestations samples, inversion of gravity anomaly data and inversion of MT data which were analyzed and integrated with geological data such as structure and stratigraphy in the research area to produce a conceptual model of the Mineral Mountains geothermal system. The results indicate that the Mineral Mountains are controlled by volcanic activity, pluton placement, and faults. The Mineral Mountains are comprised of intrusive igneous rocks, Quaternary volcanic products, as well as sediment ranging from Paleozoic to Cenozoic ages that fill the basin. The characteristics of well fluid samples and manifestation samples indicate that the water is chloride-type water with equilibrium levels ranging from partially equilibrium to fully equilibrium, and originating from the same reservoir with an estimated reservoir temperature of 250°C ± 10°C. From the conceptual model, it is found that the cap rocks appears on the surface with a thickness around 200 m, the reservoir appear at an elevation of 1300 m with a thickness around 300 m, and the heat source is hot intrusive rocks at an elevation of 1000 m with a thickness of more than 20,000 m. Meteoric water enters the reservoir through recharge zones located to the east of the research area via steeply dipping faults and exits through discharge zones located in the middle of the research area via low-angle normal faults.