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Geosciences 2018, 8(9), 354; https://doi.org/10.3390/geosciences8090354

Geological Model of a Storage Complex for a CO2 Storage Operation in a Naturally-Fractured Carbonate Formation

1
Geogreen, 2 rue des Martinets, 92569 Rueil Malmaison, France
2
Fundación Ciudad de la Energía, Avenida del Presidente Rodríguez Zapatero, 24492 Cubillos del Sil, Spain
*
Author to whom correspondence should be addressed.
Received: 23 May 2018 / Revised: 11 September 2018 / Accepted: 12 September 2018 / Published: 19 September 2018
(This article belongs to the Special Issue Geological Storage of Gases as a Tool for Energy Transition)
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Abstract

Investigation into geological storage of CO2 is underway at Hontomín (Spain). The storage reservoir is a deep saline aquifer formed by naturally fractured carbonates with low matrix permeability. Understanding the processes that are involved in CO2 migration within these formations is key to ensure safe operation and reliable plume prediction. A geological model encompassing the whole storage complex was established based upon newly-drilled and legacy wells. The matrix characteristics were mainly obtained from the newly drilled wells with a complete suite of log acquisitions, laboratory works and hydraulic tests. The model major improvement is the integration of the natural fractures. Following a methodology that was developed for naturally fractured hydrocarbon reservoirs, the advanced characterization workflow identified the main sets of fractures and their main characteristics, such as apertures, orientations, and dips. Two main sets of fracture are identified based upon their mean orientation: North-South and East-West with different fracture density for each the facies. The flow capacity of the fracture sets are calibrated on interpreted injection tests by matching their permeability and aperture at the Discrete Fracture Network scale and are subsequently upscaled to the geological model scale. A key new feature of the model is estimated permeability anisotropy induced by the fracture sets. View Full-Text
Keywords: CO2 geological storage; naturally-fractured fractured carbonates; CO2 migration plume; updated geological model; Discrete Fracture Network CO2 geological storage; naturally-fractured fractured carbonates; CO2 migration plume; updated geological model; Discrete Fracture Network
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Le Gallo, Y.; De Dios, J.C. Geological Model of a Storage Complex for a CO2 Storage Operation in a Naturally-Fractured Carbonate Formation. Geosciences 2018, 8, 354.

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