Turkish geothermal fields as natural analogues of CO 2 storage sites: Gas geochemistry and implications for CO 2 trapping mechanisms

Güleç, Nilgün; Hilton, David R.

doi:10.1016/j.geothermics.2016.04.008

Cited by 30 publications

(12 citation statements)

References 58 publications

(106 reference statements)

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“…In this respect, any possible addition of CO 2 gas to the system may lead to its fixation by carbonate precipitation in the long term. This is also in agreement with the recent findings from the He‐CO 2 gas systematics of Turkish geothermal systems, which, based on Rayleigh fractionation of CO 2 / 3 He and δ 13 C values, suggest that high temperatures increase the relative control of mineral trapping on CO 2 ‐fixation, stabilizing up to 80% of the emplaced CO 2 …”

Section: Resultssupporting

confidence: 92%

“…Based on the fact that these geothermal fields represent hydrothermal systems rich in CO 2 , the compiled data are evaluated via geochemical modelling to identify possible reactions between CO 2 , water, and rocks in terms of CO 2 fixation. This study complements the most recent study focused on He‐CO 2 isotope systematics of the Turkish geothermal systems for assessment of CO 2 ‐fixation mechanisms.…”

Section: Introductionsupporting

confidence: 53%

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Geochemical characterization of geothermal systems in western Anatolia (Turkey): implications for CO₂ trapping mechanisms in prospective CO₂‐EGS sites

Elidemir

Güleç

2017

Greenhouse Gases

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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 relevant to these systems are compiled and evaluated in terms of potential water/CO2/rock interaction processes. The evaluation is performed with geochemical approaches including speciation‐solubility calculations, and inverse and dedolomitization modelling. The results lead to the recognition of two different groups with respect to the effective processes: carbonate precipitation, and carbonate precipitation plus dissolution. In high‐enthalpy fields, carbonate precipitation seems to be the major mechanism, while others show the effects of both precipitation and dissolution; dedolomitization is also identified as a potential mechanism for one of the fields. These processes are examined with regard to CO2‐fixation; carbonate precipitation may lead to mineral trapping while carbonate dissolution provides additional cations to the system to react with CO2. Being relevant to CO2 storage in geothermal fields, the conclusions from this study point to the importance of temperature control for CO2 stabilization, as high temperatures seem to promote mineral trapping. The success of a CO2‐EGS project depends on complete geochemical characterization of reservoir processes with further kinetic modelling accompanying the thermodynamic modelling exemplified by this study. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Resultssupporting

confidence: 92%

Section: Introductionsupporting

confidence: 53%

Geochemical characterization of geothermal systems in western Anatolia (Turkey): implications for CO₂ trapping mechanisms in prospective CO₂‐EGS sites

Elidemir

Güleç

2017

Greenhouse Gases

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“…However, other studies demonstrated the strong influence of isotopic fractionation on the δ 13 C CO2(aq) and δ 13 C TDIC values, which were related to multi-step CO 2 dissolution (e.g. Weinlich, 2005;Gilfillan et al, 2009;Güleç and Hilton, 2016) and carbonate precipitation/dissolution (e.g. Ohwada et al, 2007;Gilfillan et al, 2009;Barry et al, 2014;Güleç and Hilton, 2016).…”

Section: Introductionmentioning

confidence: 97%

“…Weinlich, 2005;Gilfillan et al, 2009;Güleç and Hilton, 2016) and carbonate precipitation/dissolution (e.g. Ohwada et al, 2007;Gilfillan et al, 2009;Barry et al, 2014;Güleç and Hilton, 2016). These secondary chemical processes are considered to commonly affect thermal fluids from volcanic and hydrothermal areas (Simmons and Christenson, 1994 and references therein).…”

Section: Introductionmentioning

confidence: 99%

Fractionation processes affecting the stable carbon isotope signature of thermal waters from hydrothermal/volcanic systems: The examples of Campi Flegrei and Vulcano Island (southern Italy)

Venturi

Tassi

Bicocchi

et al. 2017

Journal of Volcanology and Geothermal Research

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“…In fact, the fluids trapped in Pamukkale travertines originated from the atmosphere‐mantle‐crust ternary mixing of the gases dissolved in the circulating waters. Four major thermal springs ( T = 35.5 °C; Şimşek et al, ) emerging at the edge of Pamukkale travertine area discharge CO 2 ‐dominated gases with 3 He/ 4 He up to 3.7 Ra (Ercan et al, ; Güleç et al, ; Mutlu et al, ; Karakuş & Şimşek, ; Güleç & Hilton, ; Pfanz et al, , Figure ). Those magmatic‐like values are the highest recorded within the Büyük Menderes graben (Karakuş & Şimşek, ; Şimşek, ), suggesting that this area is characterized by a network of joints, fractures, and lithospheric faults that permit the rise of deep fluids, although evidences of magmatism were found in the neighboring area.…”

Section: Discussionmentioning

confidence: 99%

Geochemistry of Fluid Inclusions in Travertines From Western and Northern Turkey: Inferences on the Role of Active Faults in Fluids Circulation

Rizzo

Uysal

Mutlu

et al. 2019

Geochem Geophys Geosyst

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The understanding of the relationship between the geochemistry of fluids circulating during travertine deposition and the presence of active faults is crucial for evaluating the seismogenetic potential of an area. Here we investigate travertines from Pamukkale and Reşadiye (Turkey), sited in seismic regions and next to thermal springs. These travertines formed ~24,500–50,000 (Pamukkale) and ~240–14,600 years (Reşadiye) BP. We characterize fluid inclusions (FIs) and studied concentration of H2O, CO2, O2 + N2, and 3He, 4He, 20Ne, and 40Ar, and bulk composition (trace elements and δ13C‐δ18O). FIs from both localities are mainly primary with low salinity and homogenization temperature around 136–140 °C. H2O is the major component followed by CO2, with the highest gas content measured in Pamukkale travertines. Concentrations of Ne‐Ar together with O2 + N2 indicate that travertines from both areas precipitated from atmosphere‐derived fluids. The 3He/4He is 0.5–1.3 Ra in Pamukkale and 0.9–4.4 Ra in Reşadiye. Samples with R/Ra > 1 are modified by cosmogenic 3He addition during exposure to cosmic rays. Excluding these data, FIs of Reşadiye are mostly atmosphere‐derived. This implies a shallow formation where the circulation was dominated by meteoric waters, which is consistent with their young age. Instead, FIs of Pamukkale show mixing of mantle‐, crustal‐, and atmosphere‐derived He, indicating that these travertines formed in lithospheric fractures. Based on the δ13CCO2 and δ18O of bulk rocks, we infer that travertines formed involving crustal‐ (mechanochemical rather than organic) and mantle‐derived CO2. Trace elements of Pamukkale and Reşadiye show comparable rare earth element patterns. We conclude that travertines formed in response of seismogenetic activity.

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Turkish geothermal fields as natural analogues of CO 2 storage sites: Gas geochemistry and implications for CO 2 trapping mechanisms

Cited by 30 publications

References 58 publications

Geochemical characterization of geothermal systems in western Anatolia (Turkey): implications for CO₂ trapping mechanisms in prospective CO₂‐EGS sites

Geochemical characterization of geothermal systems in western Anatolia (Turkey): implications for CO₂ trapping mechanisms in prospective CO₂‐EGS sites

Fractionation processes affecting the stable carbon isotope signature of thermal waters from hydrothermal/volcanic systems: The examples of Campi Flegrei and Vulcano Island (southern Italy)

Geochemistry of Fluid Inclusions in Travertines From Western and Northern Turkey: Inferences on the Role of Active Faults in Fluids Circulation

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Turkish geothermal fields as natural analogues of CO 2 storage sites: Gas geochemistry and implications for CO 2 trapping mechanisms

Cited by 30 publications

References 58 publications

Geochemical characterization of geothermal systems in western Anatolia (Turkey): implications for CO2 trapping mechanisms in prospective CO2‐EGS sites

Geochemical characterization of geothermal systems in western Anatolia (Turkey): implications for CO2 trapping mechanisms in prospective CO2‐EGS sites

Fractionation processes affecting the stable carbon isotope signature of thermal waters from hydrothermal/volcanic systems: The examples of Campi Flegrei and Vulcano Island (southern Italy)

Geochemistry of Fluid Inclusions in Travertines From Western and Northern Turkey: Inferences on the Role of Active Faults in Fluids Circulation

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Geochemical characterization of geothermal systems in western Anatolia (Turkey): implications for CO₂ trapping mechanisms in prospective CO₂‐EGS sites

Geochemical characterization of geothermal systems in western Anatolia (Turkey): implications for CO₂ trapping mechanisms in prospective CO₂‐EGS sites