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- W210751709 abstract "There is a clear correlation between the occurrences of late stage siderite cement near fracture edges and the enhancement of the seal capacity in the Belfast Mudstone. Isotopic evidence shows that the siderite has mineralogically trapped CO2 through CO2-brine-rock interactions within the fractures and pore space of the rock. The precipitation of the CO2 in the form of siderite has enhanced the sealing capacity of the rock. Understanding CO2-related reactions in low permeability mudstones is necessary to determine seal effectiveness in CO2 geological storage. The Pine Lodge Field contains natural CO2 within the Belfast Mudstone, a seal for many gas accumulations throughout the Otway Basin, Australia. The Pine Lodge CO2 accumulation occurs in fractured shale and interbedded siltstone/sandstone. This natural analogue for CO2 storage provides evidence of seal modification by CO2. Infiltration of CO2 into the seal rock is strongly restricted by low permeability. In the case of the Belfast Mudstone the CO2-brine-rock interaction has resulted in the enhancement of seal capacity via mineral precipitation filling fractures and pore space. However, this has only occurred due to the appropriate chemical conditions during CO2 interaction, including the availability of Fe2+ cations for siderite formation. A negative aspect of CO2 interaction is that the seal capacity could also decrease through labile mineral dissolution with the lack of appropriate cations." @default.
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- W210751709 date "2005-01-01" @default.
- W210751709 modified "2023-10-01" @default.
- W210751709 title "CO2-related seal capacity enhancement in mudstonesEvidence from the pine lodge natural CO2 accumulation, Otway Basin, Australia" @default.
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- W210751709 doi "https://doi.org/10.1016/b978-008044704-9/50324-4" @default.
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