On sorption and swelling of CO2 in clays
| Autor: | Busch, Andreas, Bertier, Pieter, Gensterblum, Y., Rother, G., Spiers, C.J., Zhang, M., Wentinck, H.M., Experimental rock deformation, CSC: Enhancing shale gas production and CO2 storage potential by promoting pore connectivity in gas shales |
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| Přispěvatelé: | Experimental rock deformation, CSC: Enhancing shale gas production and CO2 storage potential by promoting pore connectivity in gas shales |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Clay swelling 02 engineering and technology 010501 environmental sciences engineering.material 01 natural sciences chemistry.chemical_compound CO2 storage medicine Kaolinite Geotechnical engineering Chlorite 0105 earth and related environmental sciences Sorption Containment 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Dewatering Supercritical fluid CCS General Energy Geophysics chemistry Carbon dioxide Illite engineering Economic Geology Swelling medicine.symptom Smectite 0210 nano-technology Clay minerals Leakage |
| Zdroj: | Geomechanics and Geophysics for Geo-Energy and Geo-Resources, 2(2), 111. Springer |
| ISSN: | 2363-8419 |
| Popis: | The geological storage of carbon dioxide (CO2) is a well-studied technology, and a number of demonstration projects around the world have proven its feasibility and challenges. Storage conformance and seal integrity are among the most important aspects, as they determine risk of leakage as well as limits for storage capacity and injectivity. Furthermore, providing evidence for safe storage is critical for improving public acceptance. Most caprocks are composed of clays as dominant mineral type which can typically be illite, kaolinite, chlorite or smectite. A number of recent studies addressed the interaction between CO2 and these different clays and it was shown that clay minerals adsorb considerable quantities of CO2. For smectite this uptake can lead to volumetric expansion followed by the generation of swelling pressures. On the one hand CO2 adsorption traps CO2, on the other hand swelling pressures can potentially change local stress regimes and in unfavourable situations shear-type failure is assumed to occur. For storage in a reservoir having high clay contents the CO2 uptake can add to storage capacity which is widely underestimated so far. Smectite-rich seals in direct contact with a dry CO2 plume at the interface to the reservoir might dehydrate leading to dehydration cracks. Such dehydration cracks can provide pathways for CO2 ingress and further accelerate dewatering and penetration of the seal by supercritical CO2. At the same time, swelling may also lead to the closure of fractures or the reduction of fracture apertures, thereby improving seal integrity. The goal of this communication is to theoretically evaluate and discuss these scenarios in greater detail in terms of phenomenological mechanisms, but also in terms of potential risks or benefits for carbon storage. |
| Databáze: | OpenAIRE |
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