Fluid geochemistry of the Sardinian Rift-Campidano Graben (Sardinia, Italy): fault segmentation, seismic quiescence of geochemically “active” faults, and new constraints for selection of CO2 storage sites

Angelone, Massimo; Gasparini, Calvino; Guerra, M.; Lombardi, S.; Pizzino, L.; Quattrocchi, F.; Sacchi, Elisa; Zuppi, Giovanni Maria

doi:10.1016/j.apgeochem.2004.08.008

Cited by 28 publications

(47 citation statements)

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“…In Southern Sardinia, the geothermal gradient is anomalously high with 18C every 15-20 m [12]. The coal sample investigated in this work has been drilled at a depth of 500 m. For an ECBM application in the Sulcis Coal Province, optimal conditions, in terms of natural gas in place and CO 2 capacity, are expected between 800 and 1000 m due to the opposing effects of increasing pressure and increasing temperature with depth on capacities [13].…”

Section: Resultsmentioning

confidence: 99%

“…In this study, we focus on the adsorption properties of coal, and we measure the adsorption of pure carbon dioxide and methane on dry coal from the Sulcis Coal Province (SW Sardinia, Italy). Such measurements are carried out in the frame of a feasibility study for CO 2 -ECBM geological storage in the Sulcis Coal Province currently in progress [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of pure carbon dioxide and methane on dry coal from the sulcis coal province (SW Sardinia, Italy)

et al. 2006

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Enhanced coalbed methane recovery (ECBM) increases the recovery of the methane present in a coal seam by injecting CO 2 at high pressure. It is attractive from two perspectives, the valuable methane recovered and the storage of the greenhouse gas CO 2 for geological times. In the framework of a feasibility study for the Sulcis Coal Province in Italy, the adsorption of pure CO 2 and CH 4 on dry coal has been measured at 45 and 608C, using a magnetic suspension balance with in situ density measurement. The results show that the CO 2 adsorption isotherms on coal are similar to those for other standard adsorbents such as silica gel and activated carbon. From the excess adsorption isotherms, the absolute adsorption is calculated using the assumption of constant volume of the adsorbed phase. As expected, CO 2 get adsorbed more than CH 4 in all cases. The Sulcis coal can uptake CO 2 at the reservoir conditions in an amount of about 10% of its mass.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption of pure carbon dioxide and methane on dry coal from the sulcis coal province (SW Sardinia, Italy)

et al. 2006

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“…A comprehensive review of the earthquakes which have occurred in the island is reported in Angelone et al (2005). Besides, these authors discuss the Sardinia tectonic structure, the presence of fluids at depth and the occurrence of either hydrous-anhydrous mineral transitions, which can trigger seismicity (Quattrocchi 1999) or ductile layers, which may locally decrease seismicity in a regional active stress-field (Dragoni et al 1996).…”

Section: Introductionmentioning

confidence: 99%

“…The EC funded Geochemical Seismic Zonation program (EEC GSZ Project 1996-1998Lombardi et al 1999) selected Sardinia as a low-seismicity site, in which to study the relationships between fluid geochemistry and seismo-tectonics in order to establish a background benchmark to be compared with the results from other selected high-seismicity areas (Quattrocchi 1999;Quattrocchi et al 1999Quattrocchi et al , 2000Salvi et al 2000;Angelone et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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Fluid Geochemistry as Indicator of Tectonically-Related, Deep Water Circulations in the Sardinian Rift-Campidano Graben (Italy): New Insights from Environmental Isotopes

et al. 2008

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The EC funded Geochemical Seismic Zonation program (EEC GSZ Project 1996-1998 chose Sardinia as a low-seismicity site, in which the relationships between fluid geochemistry and seismo-tectonics had to be investigated and results compared with outcomes from other selected high-seismicity sites. A first article, examining the role of fault segmentation and seismic quiescence on the geochemical composition of groundwaters and gases, has already been presented (Angelone et al. 2005). This article deals with environmental isotopes which, together with selected hydrochemical data, give hints on tectonically-related fluid circulations. Four water-dominated hydrothermal systems were considered, all located along regional fault systems and discharging groundwaters belonging to the Na-HCO 3 and Na-Cl facies. In the considered systems, groundwater circulation takes place, principally, in the Palaeozoic Crystalline Basement (PCB), with the exception of the Logudoro system, where hydrological circuits develop in the Mesozoic Carbonate Platform (MCP). The high CO 2 contents, the non-attainment of fluid-rock equilibrium and the large lithological variability prevent the construction of a unique hydrogeological-geochemical conceptual model. In this case, stable isotopes provide a useful tool to describe the origin of fluids and their subterranean movements. Stable isotopes of water, integrated with hydrochemical data, indicate that fluids are derived from three main end members. The dominant component is a relatively recent local meteoric water; the second one is marine water; and the third one is a fossil freshwater, depleted in heavy isotopes with respect to modern rains. The latter end member entered the aquifer system in the past, when climatic conditions were greatly different from today. At least two circulation systems can be recognised, namely a shallow cold system and a deep hydrothermal system, as well as two distinct hydrological processes: (1) gravity-controlled descent of cold water towards greater depths and (2) convection linked to a thermal gradient, causing deep fluids to rise up from the hydrothermal reservoir towards the surface. The highly variable d 13 C TDIC values suggest the presence of two distinct CO 2 sources, namely, a biogenic one and a thermogenic one. The relation between the isotopic compositions of CO 2 and He indicates an increased mantle signature in uprising CO 2 -rich fluids.

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Characterization of low-enthalpy geothermal resources and evaluation of potential contaminants

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Cidu

Ghiglieri

et al. 2020

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Fluid geochemistry of the Sardinian Rift-Campidano Graben (Sardinia, Italy): fault segmentation, seismic quiescence of geochemically “active” faults, and new constraints for selection of CO2 storage sites

Cited by 28 publications

References 38 publications

Adsorption of pure carbon dioxide and methane on dry coal from the sulcis coal province (SW Sardinia, Italy)

Adsorption of pure carbon dioxide and methane on dry coal from the sulcis coal province (SW Sardinia, Italy)

Fluid Geochemistry as Indicator of Tectonically-Related, Deep Water Circulations in the Sardinian Rift-Campidano Graben (Italy): New Insights from Environmental Isotopes

Characterization of low-enthalpy geothermal resources and evaluation of potential contaminants

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