Browsing by Subject "geothermal system"

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Access status: Restricted ,
An alternative 3D modeling approach investigation for Electromagnetic (EM) and Transient Electro-Magnetic (TEM) data of a high temperature geothermal field
(Data obrony: 2010-07-30) Bryła, Urszula
Wydział Geologii, Geofizyki i Ochrony Środowiska
This thesis project is focused on building a 3D model of MT-TEM data at the Krafla high temperature geothermal field in Iceland. Another main objective was to develop a work flow that could be applied to other geothermal areas und their understanding of MT-TEM data set in combination with other field data. In order to achieve a 3D model of the MT-TEM data set and Krafla´s subsurface resistivity structures, a work flow was developed using Petrel, Schlumberger´s 3D geological modeling software. Two approaches have been tested to generate a 3D model, where the first approach resulted in an overly simplified and not very well comparing model. The results and learning of the first trial, lead to the second approach, where a 3D model was developed with a detailed data analysis, adjusted modeling processes in Petrel, and especially an alternative setup of the input data. Four 3D models have been obtained, two for each approach. Model based on Kriging interpolation algorithm and more advanced approach gives the most reasonable result and the best ability to compare with existed interpretations. This 3D model shows irregular structure with very low resistivity 5 ?m what may indicate magma body like a source of feeding a shallow reservoir beneath Krafla.
Access status: Open Access ,
Geological and environmental implications of the utilisation of geothermal energy in the Lahendong working area, Indonesia
(Wydawnictwa AGH, 2022) Mukti, Mentari; Tomaszewska, Barbara; Starczewska, Magdalena; Ningrum, Eva Oktavia
This study presents the characteristics of the Lahendong geothermal working area (GWA) in terms of the geological, geophysical, geochemical, and environmental implications. The investigated area is located in the Sulawesi North Arm, where the volcanic arc extends from Sangihe Island to Minahasa with two major strike-slip faults. NE–SW (northeast-southwest) trending faults control the thermal surface manifestation. The geothermal field is grouped into two hydrochemical systems: acid-sulphate-chloride (acid reservoir) and chloride (closer to neutral) types. The environmental implication analysis shows that the North Sulawesi province is experiencing water shortages due to excessive mining activities, inadequate wastewater management, and periods of drought. Although geothermal wastewater is being re-injected, the possibility of water contamination by hazardous materials from geothermal power plant activity is still evident. This study reviews the actual geothermal utilisation in the form of the 120 MWe power plant, the 500 kWe binary power plant, while the heat from geothermal energy is used for palm sugar production. Furthermore, the article also analyses the potential of the rational use of geothermal resources in this area. As a result of the high salinity and silica concentration of the brine, the geothermal wastewater should be treated before further utilisation and it potentially benefits both local communities and geothermal companies.