Geochemical modeling of CO2-water-rock interaction in indonesian geothermal fields for a possible future carbon capture and storage project

Utomo, Gagas Pambudi
The rise of CO2 concentration in Earth’s atmosphere from anthropogenic emissions is the main cause of global warming and climate change. Carbon Capture and Storage (CCS) is considered as an effective method to reduce such emission. CCS can be performed in various sites including geothermal reservoirs. This study is concerned with geochemical modeling of CO2-water-rock interaction for a possible future CCS project in Indonesian geothermal fields, namely Ungaran, Baturaden, Dieng and Awibengkok. The modeling is performed using PHREEQC program and the data published in mainstream journals, and attempts to examine the effect of CO2 injection on the rock and water composition of the geothermal reservoirs. Modeling assumes a single stage CO2 injection at constant pressure and temperature. The study consists of equilibrium and kinetic modeling. Equilibrium modeling reveal: 1) potential for mineral trapping via the formation of carbonates, 2) increasing pH in Ungaran and Baturraden, 3) decreasing pH in Dieng and Awibengkok and 4) decreasing porosity for all fields except Ungaran. Kinetic modeling suggests that solubility trapping existed immediately after CO2 injection and is followed by complete or partial replacement of mineral trapping as suggested by the drop in dissolved CO2 concentration. The modeling identified reactions involving the formation of new carbonates: i) anorthite dissolution to calcite in Ungaran, ii) diopside dissolution to dolomite in Baturraden and Dieng and iii) calcite dissolution and dolomite dissolution to magnesite in Awibengkok. Equilibrium state is reached in 10 years for Ungaran and Baturraden, 10 hours for Dieng and 10000 years for Awibengkok.


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Geological storage of CO2 is currently regarded as one of the major strategies to mitigate the increasing CO2 concentrations in the atmosphere due to anthropogenic emissions from large-scale point sources. Enhanced geothermal systems (EGS) are a novel concept in which CO2 is used as a working fluid to increase energy recovery, combined with its subsurface storage. In this study, the geothermal systems of western Anatolia are considered as potential sites for EGS, and the published hydrogeochemical data rele...
Geochemical characterization of geothermal systems in Turkey as natural analogues for geological storage of Co2/
Elidemir, Sanem; Güleç, Nilgün Türkan; Department of Geological Engineering (2014)
To mitigate the unfavourable effect of CO2 emission on global warming and climate change, geological storage of CO2 is currently regarded to be one of the major strategies. Deep saline formations constitute one of the alternative reservoirs for hosting the injected CO2 and the information about the behaviour of these reservoirs is provided via the studies of natural analogues. This thesis is concerned with the geothermal systems of Turkey as natural analogues for CO2 storage sites and the evaluation of thei...
Olası CO2 Depolama Sahaları Olarak Akköy ve Edremit Jeotermal Sistemlerindeki Akışkan - Kayaç Etkileşimlerinin Jeokimyasal Modellemesi: Ön Çalışma Sonuçları
Elidemir, Sanem; Güleç, Nilgün Türkan (2021-05-24)
CO2 ’in yeraltında depolanması, i) insan kaynaklı emisyonlardan dolayı atmosferdeki CO2 miktarındaki artışın ve ii) bu emisyonların, küresel ısınma ve iklim değişikliği üzerindeki istenmeyen etkilerinin azaltılması konusundaki başlıca stratejilerden bir tanesidir. Geliştirilmiş Jeotermal Sistemler (EGS), CO2 ’in rezervuara geri basımı ile enerji üretiminin arttırılmasının yanı sıra yeraltında depolanmasını sağlayan yenilikçi bir yaklaşımdır. Bu ön çalışma kapsamında, olası EGS sahaları olarak Batı Anadolu’d...
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Landfills all around the world are one of the major sources that contribute towards global warming and climate change. Although landfilling should be prioritized last in the waste management hierarchy due to highest greenhouse gas emissions as compared to other waste management systems it is still very common around the world. In this study, methane emissions are estimated by applying First Order Decay model to landfills in Pakistan over the latest data available by Pakistan Environmental Protection Agency....
Experimental and numerical investigation of carbon sequestration in saline aquifers
Izgec, O.; Demiral, B.; Bertin, H.; Akın, Serhat (null; 2005-07-28)
Because of the global warming threat posed by greenhouse gases, mainly by CO2, some strategies were proposed. Along those, disposal and long term storage, of greenhouse gases is important for reducing global warming. Aquifers represent the most widely available and the second largest, naturally occurring potential store for CO2. Although there are a number of mathematical modeling studies related to injection of CO2 in deep saline aquifers, experimental studies are limited and most studies focus to sandston...
Citation Formats
G. P. Utomo, “Geochemical modeling of CO2-water-rock interaction in indonesian geothermal fields for a possible future carbon capture and storage project,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Geological Engineering., Middle East Technical University, 2019.