Multicomponent Geothermometry Applied to a Medium-low Enthalpy Carbonate-evaporite Geothermal Reservoir

Battistel, Maria; Hurwitz, Shaul; Evans, William C.; Barbieri, Maurizio

doi:10.1016/j.egypro.2014.10.389

Cited by 16 publications

(8 citation statements)

References 19 publications

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“…There is no δ 1 8 O shift toward heavier values in the studied samples. This is speculatively because of the CO 2 probably originating from deep degassing additional to carbonate dissolution that mixed with the waters and masked the effect of fluid-rock interaction (Battistel et al, 2014). This inference corroborates with the HCO…”

Section: Insights On Recharge Source and Water-rock Interactionssupporting

confidence: 62%

Water-rock interaction, formation and circulation mechanism of highly bicarbonate groundwater in the northwestern geothermal prospects of Rwanda

et al. 2022

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Five thermal springs, twelve non-thermal springs, and two lake water samples from the northwestern part of Rwanda were studied to assess their chemical characteristics and infer the formation mechanism of the thermal waters. Multicomponent mineral equilibrium (MME) geothermometer calculations at Gisenyi prospects with the highest in situ measured temperature (73.1°C) showed the reservoir temperature of 90±6°C. The MME temperature estimates agreed well with Silica-based, K-Mg and Mg-Li geothermometers while the other cation geothermometers (Na-K, Na-K-Ca, Na-K-Ca-Mg, and Na-Li) results are unreliable. Most of the non-thermal springs are Ca-Mg-HCO 3 water-type while the thermal spring waters were majorly Na-HCO 3 . The δD composition varied from -16.6 to -5.9‰ and from -11.8 to -5.0‰, while the δ 18 O ranged from -4.17 to -3.5‰ and -4.32 to -2.7‰, for thermal and non-thermal springs, respectively. All isotopic ratios scattered around the meteoric water lines, thus indicating their similar meteoric origin. In addition, there was no observable δ 18 O positive shift speculating less extent of water-rock interactions while geogenic CO 2 ingress into the waters has been ascertained by both isotopic and chemical component ratios. We proposed a circulation mechanism of the thermal waters for the study area.

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Section: Insights On Recharge Source and Water-rock Interactionssupporting

confidence: 62%

Water-rock interaction, formation and circulation mechanism of highly bicarbonate groundwater in the northwestern geothermal prospects of Rwanda

et al. 2022

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“…Hydrothermal systems can be found in various geological settings and are hosted in different types of wall-rocks, but generally are found in high heat flow and volcanic regions associated with tectonic plate boundaries, and/or in the areas with sedimentary rocks of high porosity and permeability, the water in the sediments is heated by the regional heat flow. The major goals of geochemical studies in geothermal systems are to predict the subsurface temperatures, to understand the circulation of the thermal fluids and to have information on their origin [5]. Hydrogeochemistry, including isotope geochemistry, has greatly contributed to the present understanding of geothermal systems.…”

Section: Introductionmentioning

confidence: 99%

Isotope studies and chemical investigations of hot springs from North-Eastern Algeria

Chenaker¹,

Houha²,

Vallès³

2017

JMES

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“…The high permeability Mesozoic limestone in Central Italy is the primary regional groundwater aquifer which hosts numerous geothermal reservoirs with temperatures ranging between 48°C and 115°C (Minissale, 2004). The reservoir temperature of Cimino-Vico geothermal system is ~94°C, based on multicomponent geothermometry (Battistel et al, 2014). Abundant CO 2 from active metamorphism is dissolved in the aquifer (Chiodini et al, 1999;Duchi et al, 1987;Minissale and Duchi, 1988).…”

Section: Geological Frameworkmentioning

confidence: 99%

“…The relatively low temperature in the geothermal reservoir (Battistel et al, 2014) and the relatively large effect of the CO 2 on the  18 O value imply that fluid-rock interaction has a minimal effect on the isotope ratio ( Figure 7).…”

Section: Processes Controlling Water Chemistrymentioning

confidence: 99%

The chemistry and isotopic composition of waters in the low-enthalpy geothermal system of Cimino-Vico Volcanic District, Italy

Battistel

Hurwitz

Evans

et al. 2016

Journal of Volcanology and Geothermal Research

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Geothermal energy exploration is based in part on interpretation of the chemistry, temperature, and discharge rate of thermal springs. Here we present the major element chemistry and the δD, δ18O, 87Sr/86Sr and δ11B isoto- pic ratio of groundwater from the low-enthalpy geothermal system near the city of Viterbo in the Cimino-Vico volcanic district of west-Central Italy. The geothermal system hosts many thermal springs and gas vents, but the resource is still unexploited. Water chemistry is controlled by mixing between low salinity,HCO3-rich fresh waters (b24.2 °C) flowing in shallow volcanic rocks and SO4-rich thermal waters (25.3 °C to 62.2 °C) ascending from deep, high permeability Mesozoic limestones. The (equivalent) SO4/Cl (0.01–0.02), Na/Cl (2.82–5.83) and B/Cl ratios (0.02–0.38) of thermal waters differs from the ratios in other geothermal systems from Central Italy, probably implying a lack of hydraulic continuity across the region. The δ18O (−6.6‰ to −5.9‰) and δD (− 40.60‰ to − 36.30‰) isotopic composition of spring water suggest that the recharge area for the geothermal system is the summit region of Mount Cimino. The strontium isotope ratios (87Sr/86Sr) of thermal waters (0.70797–0.70805) are consistent with dissolution of the Mesozoic evaporite-carbonate units that constitute the reservoir, and the ratios of cold fresh waters mainly reflect shallow circulation through the volcanic cover and some minor admixture (b10%) of thermal water as well. The boron isotopic composition (δ11B) of fresh waters (−5.00 and 6.12‰) is similar to that of the volcanic cover, but the δ11B of thermal waters (−8.37‰ to − 4.12‰) is a mismatch for the Mesozoic reservoir rocks and instead reflects dissolution of secondary boron min- erals during fluid ascent through flysch units that overlie the reservoir. A slow and tortuous ascent enhances ex- traction of boron but also promotes conductive cooling, partially masking the heat present in the reservoir. Overall data from this study is consistent with previous studies that concluded that the geothermal system has a large energy potential

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Multicomponent Geothermometry Applied to a Medium-low Enthalpy Carbonate-evaporite Geothermal Reservoir

Cited by 16 publications

References 19 publications

Water-rock interaction, formation and circulation mechanism of highly bicarbonate groundwater in the northwestern geothermal prospects of Rwanda

Water-rock interaction, formation and circulation mechanism of highly bicarbonate groundwater in the northwestern geothermal prospects of Rwanda

Isotope studies and chemical investigations of hot springs from North-Eastern Algeria

The chemistry and isotopic composition of waters in the low-enthalpy geothermal system of Cimino-Vico Volcanic District, Italy

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