Long-term performance of a mudrock seal in natural CO2 storage

Lu, J., Wilkinson, M., Haszeldine, R.S. and Fallick, A.E. (2009) Long-term performance of a mudrock seal in natural CO2 storage. Geology, 37(1), pp. 35-38. (doi: 10.1130/G25412A.1)

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Publisher's URL: http://dx.doi.org/10.1130/G25412A.1


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 δ13C traces the progressive penetration of free-phase CO2 causing dissolution and reprecipitation of carbonate minerals. The CO2 was emplaced ca. 70–80 Ma, and has only penetrated 12 m vertically in this case. The infiltration rate is estimated as ~9.8 x 10–7g cm–2 yr–1. Engineered CO2 storage under this type of mudrock seal will have a considerable safety margin.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Fallick, Professor Anthony
Authors: Lu, J., Wilkinson, M., Haszeldine, R.S., and Fallick, A.E.
Subjects:Q Science > QE Geology
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Geology
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