Updated Conceptual Model and Resource Assessment using Numerical Reservoir Simulation of Danau Ranau Geothermal Field Indonesia

Abstract

Danau Ranau geothermal field is located in Lampung and South Sumatra province, Indonesia. It is classified as a high terrain volcanic hydrothermal system controlled by the Sumatran fault as the permeability zone. The study aims to characterize the Danau Ranau reservoir, update the conceptual model, and assess the geothermal power capacity coupled with Monte Carlo simulation. Therefore, the numerical reservoir simulation is performed using TOUGH2 software to achieve a natural state model based on geoscience interpretation data. The numerical reservoir models’ output matches the geological, geochemical, and geophysical interpretation, thus becoming important information (3D pressure and temperature, heat and mass flow, location of heat source, boundary condition, reservoir geometry) in the updated conceptual model. The probabilistic heat stored method results based on the natural state model’s output show that Danau Ranau geothermal field can generate up to 30 MW.

Identification of Geodiversity and Geosite Assessment around Geohazard Area of Suoh Aspiring Geopark in West Lampung, Sumatra, Indonesia

“…The mountain is located on the boundary between the two provinces of Lampung and South Sumatera. Ranau Lake is Sumatra's second-biggest lake after Toba Lake in the North Sumatra Province [34]. Even though the height is not particularly high, the view from the mountain's summit is breathtaking.…”

“…This geothermal system's infiltration and recharge zones are Suluh Hill and Ranau Lake. In a cooling stage, magma serves as a heat source for the Ranau Lake geothermal field (Figure 5) [23,34,35]. Mount Seminung is a volcano in the Ranau Lake caldera and located around 35 km northwest of the capital district of Liwa, West Lampung, Lampung Province, Sumatra, Indonesia.…”

“…Aside from the edelweiss blossoms, geothermal manifestations can also be found at its peak. Those manifestations may be seen around Ranau Lake [23,34] and have been used by the community as tourist destination for hot springs. The geothermal manifestation around Ranau Lake is a medium enthalpy field with a reservoir temperature of 200-220 • C. The productive zone (reservoir) area range is predicted to be between 14 and 17 km 2 .…”

Probabilistic Resource Assessment of The Ulumbu Geothermal Field, East Nusa Tenggara, Indonesia

“…The integrated reservoir studies using reservoir simulation had been carried out by several researchers, a greenfield and brownfield of geothermal fields. Several geothermal greenfield numerical modelling, not yet been developed for production, have been carried out, such as Atadei (Supijo et al, 2019a(Supijo et al, , 2019b(Supijo et al, , 2018Pratama et al, 2020;Supijo et al, 2020), Danau Ranau (Afiat et al, 2021), Cisolok-Cisukarame (Sumartha et al, Ungaran (Assiddiqy et al, 2021), Songa-Wayaua (Hasbi et al, 2020), and Arjuno-Welirang (Putra et al, 2019). The greenfield numerical model provides a piece of useful information for consistency with the conceptual model.…”

Resource Assessment of Ungaran Geothermal Field Using Numerical model and Monte Carlo Simulation

“…However, it has a value at that stage, but this method may be best for checking for consistency or updating the conceptual model. This method has applied in Arjuno-Welirang [3], Atadei [4][5][6][7], Patuha [8][9][10][11], Cisolok-Cisukarame [12], Kerinci [13], Tompaso [14,15], 1031 (2022) 012021 IOP Publishing doi:10.1088/1755-1315/1031/1/012021 2 Ulumbu [16][17][18], Mataloko [19,20], Karaha-Talaga Bodas [21][22][23], Songa-Wayaua [24], Danau Ranau [25,26], Lumut Balai [27].…”