| Citation |
Lu, J.J, Wilkinson, M, Haszeldine, S. and Fallick, A Long-term performance of a mudrock seal in natural CO2 storage. 2009. https://doi.org/10.1130/G25412A.1. Cite this using DataCite |
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| Author(s) |
Lu, J.J, Wilkinson, M, Haszeldine, S. and Fallick, A |
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| Opus Title |
Geology |
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| Pages |
35-38 |
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| Volume |
37 |
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| DOI |
https://doi.org/10.1130/G25412A.1 |
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| Abstract |
The ability of mudrock seals to prevent CO2 leakage is a major concern for geological storage of anthropogenic CO2. The long-term performance of a mudrock seal, which provides a natural analogue, in the North Sea Miller oil field has been evaluated. This mudrock seal is immediately above a natural CO2-rich reservoir. The paper reports the stable isotopes of carbon from carbonate minerals in the mudrock that have precipitated in contact with CO2 during 4 km of burial. A well-defined linear trend of upward-decreasing 13C traces the progressive penetration of free-phase CO2 causing dissolution and reprecipitation of carbonate minerals. The CO2 was emplaced ca. 7080 Ma, and has only penetrated 12 m vertically in this case. The infiltration rate is estimated as ~9.8 107g cm2 yr1. Engineered CO2 storage under this type of mudrock seal will have a considerable safety margin. |
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