| Title | Technology Development of 'Steam Spot' Detection for Suitable Location of Production Wells by Integrating Geoscientific Methods |
|---|---|
| Authors | Katsuaki KOIKE, Taiki KUBO, Koki KASHIWAYA, Yohei TADA, Tada-nori GOTO, Shigeki SAKURAI, Sudarto NOTOSISWOYO, Mohamad Nur HERIAWAN, Lrwan lSKANDAR, Asep SAEPULOH, Arie Naftali Hawu HEDE, Nenny Miryani SAPTADJI, SUTOPO |
| Year | 2020 |
| Conference | World Geothermal Congress |
| Keywords | international collaboration project, fracture system, remote sensing, geochemistry, Wayang Windu |
| Abstract | A five-year collaboration project between Kyoto University and Bandung Institute of Technology as core groups, entitled “Project for technology development of steam-spot detection and sustainable resource use for large enhancement of geothermal power generation in Indonesia†is ongoing under the framework of SATREPS. This project aims to development technologies that can reduce drilling costs and increase success rate of production-well location by detecting steam spots through a combination of remote sensing, mathematical geology, geochemistry, geophysics, and mineralogy. In addition to the steam-spot detection, remote sensing-based technologies for environmental monitoring to check the effect of geothermal power plant operation and the optimal operation control system of geothermal power generation for long-term use of geothermal resource are tried to be developed. Human resource development for the geothermal science and technology is also an important target of this project. Steam spot is a coined word for the permeable fractures with much amount of thermal water and steam that enables large and long-term power generation. By selecting the Wayang Windu geothermal field in West Java, Indonesia for a case study, this paper presents an effectiveness to consider lineament direction and density extracted from multi-shaded digital elevation model and SAR intensity image, presence of hydrothermal alteration minerals detected from optical sensor imagery, temporal-change pattern in radon concentrations in soil gasses at many borehole points, and water and gas geochemical features for locating steam spots. By integrating all the results, steam spots may be formed by continuous fractures in steam- and upflow-dominated portion in reservoir, which yields high and temporally stable radon concentrations in soil gases and alteration minerals with high temperature of stability near the surface. This project will advance towards the overall goal that exploratory drilling cost at planned sites of geothermal power plant is reduced due to the application of the technologies developed. |