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Do the sedimentary strata have power to neutralize leaking CO2 ?: A natural analogue study on past CO2 invasion and carbonate precipitation in the Cretaceous Izumi Group, SW Japan by Yasuko Okuyama; Yoshito Nakashima; Munetake Sasaki; Akira Ueda is a Engineering article available to read on EtoBox.

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Dawsonite, which frequently plays an important role in geochemical modelling of CO 2 storage complex, is a rare mineral in the nature. This study reports mode of occurrences of natural dawsonite recently re-discovered in a classical locality of Japan (the Izumi Group, SW Japan), in comparison with our geochemical modelling of CO 2 storage in sedimentary strata. The simulation has shown that dawsonite is only stable in the early stage of the evolution of CO 2 storage complex even though an extensive precipitation of this mineral in the CO 2 -affected part within. Natural dawsonite forms mineral veins in a compact mudstone layer, and is also found to be a product of early stage of carbonate veining. The observation is concordant with the simulation result suggesting a temporal limit on the stability of dawsonite in the evolution of storage fluid with time. It is also probable that the precipitation occurred associated with the formation of fractures in mudstone to self-seal them effectively. The relation can be a support to assure the storage security, showing how a cap rock mudstone respond to pressurized CO 2 which could be expected as "pressure build up" during the injection phase

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Author

Yasuko Okuyama; Yoshito Nakashima; Munetake Sasaki; Akira Ueda

Publisher

Elsevier ; Elsevier BV (ISSN 1876-6102)

Published

2011

Language

EN

Field

Engineering (Physical Sciences)