CO2 degassing from a Spanish natural analogue for CO2 storage and leakage: Implications on 222Rn mobility

Rodrigo-Naharro, Julio; Quindós, Luis; Clemente-Jul, Carmen; Mohamud, Abdullahi Hassan; Villar, Luis

doi:10.1016/j.apgeochem.2017.07.008

Cited by 14 publications

(3 citation statements)

References 37 publications

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“…The carrier gases, like CO 2 , play, in fact, a critical role in controlling the migration and transport of trace gases such as 222 Rn towards the surface 1,17,51,[61][62][63][64] . Due to the diffusion coefficient in dry soil (5 • 10 −6 m 2 /s) 65 and half-life (3.82 days), the large ranges of soil 222 Rn activities can be explained by a double origin 1 : (i) the radon is generated by the decay of 238 U accumulated in the soil (usually low activity concentration of several Bq/m 3 ); (ii) the radon produced by the decay of 238 U from deeper levels migrates upward, transferred by carrier gases through faults and fractures (high activity concentration up to several ten thousand Bq/m 3 ).…”

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confidence: 99%

Continuous radon monitoring during seven years of volcanic unrest at Campi Flegrei caldera (Italy)

Sabbarese

Ambrosino

Chiodini

et al. 2020

Sci Rep

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This is a seven-year study (1/7/2011-31/12/2017) of radon monitoring at two sites of Campi Flegrei caldera (Neaples, Southern Italy) that in the last 70 years experienced repeated phases of volcanic unrest. The sites are equipped with devices for radon detection, based on the spectrometry analysis of the α-particles of radon daughters. A hybrid method, as combination of three known methods, is applied for the identification of residuals (anomalies) and trends of the time series of Radon. The results are compared with the following indicators of current caldera unrest: the tremor caused by the major fumarolic vent registered by a seismic station; the cumulative of background seismicity; the maximum vertical deformation acquired by GPS networks during the current phase of uplift; the temperaturepressure of the hydrothermal system estimated based on gas geo-indicators. The comparisons show strong correlation among independent signals and suggest that the extension of the area affected by current campi flegrei crisis is larger than the area of seismicity and of intense hydrothermal activity from which the radon stations are 1-4 km away. These results represent an absolute novelty in the study of a such calderic area and mark a significant step forward in the use and interpretation of the radon signal.

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confidence: 99%

Continuous radon monitoring during seven years of volcanic unrest at Campi Flegrei caldera (Italy)

Sabbarese

Ambrosino

Chiodini

et al. 2020

Sci Rep

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“…Nevertheless, As could also result from agricultural pollution due to the use of herbicides, pesticides or even fertilizers based on superphosphate (Fetter, 1993). Concerning the other trace elements, it is possible to highlight the following aspects: (i) the high Sr and Li contents are related to the carbonate rocks that compose the basin basement (Gómez-Pugnaire et al, 1981) and to the dissolution of marine salts, respectively; (ii) the relatively high Cr concentrations, particularly in El Saladillo and El Reventón, are probably associated with the corrosion of the water distribution pipelines, a process that may also be partially responsible for the Fe and Mn values; (iii) the relevant U concentrations are probably related to the dissolution of uraninite (UO 2 ) from the Urich volcanic rocks existing in the basin (Rodrigo-Naharro et al, 2012, 2017. In summary, it can be argued that the slightly acid groundwater studied has a great capacity to dissolve and transport a large amount of heavy elements towards the surface, some of them being highly toxic.…”

Section: Groundwatermentioning

confidence: 99%

“…In the framework of a large project on Carbon Capture and Storage (CCS) technologies, the Gañuelas-Mazarrón Tertiary Basin (GMTB), SE Spain, was studied as an analogue of a natural CO 2 reservoir affected by leakages (Pérez del Villar et al, 2008;Nisi et al, 2010a,b;Rodrigo-Naharro et al, 2011, Rodrigo-Naharro et al, 2013aRodrigo-Naharro, 2014;Rodrigo-Naharro et al, 2017, 2018. CO 2 -rich saline groundwater from deep and thermal aquifers are currently upwelling through geothermal wells, precipitating travertines at the water discharge points.…”

Section: Introductionmentioning

confidence: 99%

Current travertines precipitation related to artificial CO2 leakages from a natural reservoir (Gañuelas-Mazarrón Tertiary Basin, SE Spain)

Rodrigo-Naharro

Herrero

Huertas

et al. 2019

Journal of Hydrology

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In the framework of a natural CO 2 reservoir with CO 2 leakages as an analogue of a failed CO 2 deep geological storage, the current precipitation of travertines and the associated upwelling of CO 2-rich saline groundwater were analysed. This natural analogue is located in the Gañuelas-Mazarrón Tertiary Basin (SE Spain). The study comprises of the chemistry of both groundwater and travertines, including stable isotopes, mineralogy and petrography of the travertines, all this performed after a review of the geology of the basin. In this sense, the basin gathers the main features of a safe natural CO 2 reservoir in a deep saline aquifer sealed by a thick marl formation. The aquifer was artificially perturbed by the drilling of wells, inducing the travertines precipitation at these water discharge points. Groundwater is saline, slightly acid, oversaturated in aragonite and calcite and with significant concentrations of heavy elements, some of them toxic. From an isotopic viewpoint, the relative constant δ 13 C-DIC values suggest that carbon is mainly inorganic in origin with minor organic and mantle contributions. Travertines are basically composed of aragonite or calcite, their precipitation being controlled by a sudden CO 2 degassing and minor biological activity. Their δ 13 C signatures indicate that carbon mainly has an inorganic origin, although some contribution of organic carbon must be considered as well. Furthermore, these carbonate deposits did not precipitate in isotopic equilibrium, as determined by δ 18 O values. Finally, it is suggested that the appearance of travertines along with their carbon isotopic signatures represent efficient tools for detecting CO 2 leakages from any CO 2 storage site.

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Hurtado¹,

Eguilior²,

Rodrigo-Naharro³

et al. 2020

CO2 Injection in the Network of Carbonate Fractures

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CO2 degassing from a Spanish natural analogue for CO2 storage and leakage: Implications on 222Rn mobility

Cited by 14 publications

References 37 publications

Continuous radon monitoring during seven years of volcanic unrest at Campi Flegrei caldera (Italy)

Continuous radon monitoring during seven years of volcanic unrest at Campi Flegrei caldera (Italy)

Current travertines precipitation related to artificial CO2 leakages from a natural reservoir (Gañuelas-Mazarrón Tertiary Basin, SE Spain)

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