Numerical modeling for the steady-state condition of the geothermal system in Way Ratai

Karyanto; N. Haerudin; A. Zaenudin; Suharno; I.G.B Darmawan; M. Adli; P. Manurung

doi:10.6180/jase.202206_25(3).0011

Numerical modeling for the steady-state condition of the geothermal system in Way Ratai

Karyanto This email address is being protected from spambots. You need JavaScript enabled to view it.^1,2, N. Haerudin², A. Zaenudin², Suharno², I.G.B. Darmawan², M. Adli², and P. Manurung³

¹Doctoral Program of Mathematics and Natural Science, University of Lampung, Jalan Prof. Soemantri Brojonegoro No.1, Bandar Lampung 35145, Indonesia
²Department of Geophysical Engineering, University of Lampung, Jalan Prof. Soemantri Brojonegoro No.1, Bandar Lampung 35145, Indonesia
³Department of Physics, University of Lampung, Jalan Prof. Soemantri Brojonegoro No.1, Bandar Lampung 35145, Indonesia

Received: December 20, 2020
Accepted: June 29, 2021
Publication Date: October 11, 2021

Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.6180/jase.202206_25(3).0011

ABSTRACT

Steady-state model of geothermal system in Way Ratai for exploration activities was numerically modelled by using the HYDROTHERM INTERACTIVE software based on the Newton-Raphson algorithm. In the present numerical modelling, cross-sectional area was determined by around 18 km in length of northwest-southeast (NW-SE) direction and 5 km in vertical direction from a mean sea level (msl) using grids width of 100 m, 200 m, and 500 m. Numerical simulation was run for 100,000 years using an interval 1000 years along with manifestation data as reference current conditions. Significant results of simulation were obtained at a 25,000 iteration years, identifying as steady-state condition for theWay Ratai geothermal system. The numerical results show that geothermal reservoirs potentially has a length range of approximately 9 km, with a thickness of 0.5-1.5 km with a temperature ranging from 250 - 350C. The reservoir’s depth is ranging from 600-1200 m beneath thick caprocks and strengthens previous AMT research results. The distribution of steam trapped in the southeastern part of the Way Ratai peak becomes an important target for exploration drilling. Furthermore, according to large area, thickness, and high reservoir temperature from numerical models, the Way Ratai geothermal system is potential to being explored because the geothermal reservoirs contain a high enthalpy mass of steam.

Keywords: geothermal, Way Ratai numerical model, reservoir temperature, steady-state

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