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A Contribution to the Geological Characterization of a Potential Caprock-Reservoir System in the Sulcis Coal Basin (South-Western Sardinia)

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Dipartimento di Ingegneria Civile, Ambientale e Architettura (DICAAR), Università di Cagliari, Via Marengo 2, 09123 Cagliari, Italy
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Consorzio Interuniversitario Nazionale per l’Ingegneria delle Georisorse (CINIGeo)-Viale Vittorio Emanuele II 244, 00186 Roma, Italy
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Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, Via Donato Creti 12, 40128 Bologna, Italy
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Sotacarbo, Grande Miniera Serbariu SS126, 09013 Carbonia, Italy
*
Author to whom correspondence should be addressed.
Energies 2019, 12(23), 4524; https://doi.org/10.3390/en12234524
Received: 2 October 2019 / Revised: 23 November 2019 / Accepted: 24 November 2019 / Published: 27 November 2019
The results provided by this study contribute to the geological characterization of a potential caprock-reservoir system for CO2 storage in the experimental area of the mining district of the Sulcis Coal Basin (south-western Sardinia, Italy). The work is aimed to improve the knowledge of the petrographic and petrophysical characteristics of the siliciclastic and carbonate geological formations that make up the potential caprock-reservoir system. Core samples from a number of wells drilled in the study area for mining purposes were analyzed especially for texture and physical properties (longitudinal velocity, density, porosity, and permeability). The preliminary integrated petrographic and petrophysical characterizations indicate that the Upper Paleocene to Early Eocene potential carbonate reservoir is heterogeneous but presents suitable reservoir zones for CO2. A preliminary analysis of the potential caprock siliciclastic lithologies of the Middle Eocene to Lower Oligocene suggests that they appear suitable for CO2 confinement. Finally, to account for the stability of the investigated area, an accurate geodynamical study of south-western Sardinia was carried out using global navigation satellite system and advanced differential interferometric synthetic aperture radar methodologies in order to estimate vertical and horizontal crustal displacements. The study area results stable, since it is characterized by surface crustal horizontal and vertical velocities smaller than 1 mm/year and few mm/year, respectively. View Full-Text
Keywords: petrophysical properties; carbonates; siliciclastics; GNSS DinSAR; crustal displacements petrophysical properties; carbonates; siliciclastics; GNSS DinSAR; crustal displacements
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Fais, S.; Casula, G.; Cuccuru, F.; Ligas, P.; Bianchi, M.G.; Plaisant, A.; Pettinau, A. A Contribution to the Geological Characterization of a Potential Caprock-Reservoir System in the Sulcis Coal Basin (South-Western Sardinia). Energies 2019, 12, 4524.

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