Geothermal reservoir depth of Seulawah Agam volcano estimated from 1D magnetotelluric

Abstract

SeulawahAgam has planned to construct a geothermal power plant with an estimated 275 MW by the government to replace fossil energy. This study used a magnetotelluric (MT) survey to investigate the primary geothermal system, such as heat sources, reservoirs, or faults, which are responsible for regulating the surface manifestation. The regional volcano and fault of the Seulimum segments were traversed by 26 MT stations. The 1D Inversion was conducted toward the overall MT data using the Occam inversion algorithm from IP2Win MT. This Inversion was performed to acquire characteristics of the geothermal system based on resistivity parameters against the depth. The 1D model distribution was combined and converted into pseudo 2D, which could depict the subsurface conditions. Based on the data analysis, the cross-section model revealed that the volcanic sediment layer near the surface had a resistivity of 57–98 Ωm. In the depth of 4–8 km in profile one, and 0.2–2 km, in profile 2, coverage of clay cap rocks was found with impermeable properties, where the resistivity was low (<10 Ωm). Afterward, the reservoir layer was characterized by resistivity ranging from 94 to 188 Ωm located at 1–3 km depth, where this anomaly could be seen across all measuring tracks. Meanwhile, the region beneath the reservoir was estimated to be a heat source with a depth range of 2–5 km, as evidenced by a high resistivity of more than >1000 Ωm. The pseudo-2D results could provide an initial model of SeulawahAgam’s geothermal system.

Identifying the structure as a hot water outflow path using gravity in Jatimulyo, South Lampung

“…To tap into this remarkable resource, geophysicists employ advanced techniques to image and characterize subsurface layers. Geophysical methods such as magnetotellurics [9], gravity [10], magnetic [6,8] , and direct current (DC) resistivity and very low frequency (VLF) [11]serve as the critical first step in identifying and characterizing geothermal systems. In this discussion, we'll delve into the fascinating world of geophysical exploration, unveiling the ingenious techniques that reveal the hidden, underground pathways of scalding water.…”

Optimizing the Gravity Data and Geological Observation for Mapping the Local Fault around the Jaboi Volcano

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Monitoring of Heat Flux Energy in the Northernmost Part of Sumatra Volcano Using Landsat 8 and Meteorological Data

“…In the province of Aceh (northernmost of Sumatra), although there are many active volcanoes, none of these volcanoes have been developed into power plants. It is necessary to conduct several integrated studies as an effort to accelerate the development of geothermal powerplants, i.e., the Seulawah volcano with an estimated energy of 230 MWe (Marwan et al, 2022). The water and temperature characteristics of the volcano have been assessed using geochemical method (Idroes et al, 2019).…”