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- W2739894961 abstract "High-CO2 gas fields serve as important analogues for understanding various processes related to CO2 injection and storage. The chemical signatures, both within the fluids and the solid phases, are especially useful for elucidating preferred gas migration pathways and also for assessing the relative importance of mineral dissolution and/or solution trapping efficiency. In this paper, we present a high resolution study focussed on the Gorgon gas field and associated Rankin trend gases on Australia’s Northwest Shelf of Australia. The Gorgon field is characterized by a series of stacked reservoirs (Figure 1), and is therefore well placed to characterize CO2 migration, dissolution and reaction by looking at geochemical signatures in the different reservoirs. Hydrological data at the Gorgon field also suggests that many of the major faults possess very low transmissivities, which should prevent or limit mixing of reservoir fluids with different chemical imprints. The gas data we present here reveal correlatable trends for mole %-CO2 and δ 13 C CO2 both areally and vertically as observed by Edwards et al. (2007). We suggest that the observed relationships are imparted due to mineral carbonation reactions that occurred along the CO2 migration pathway. These results have important implications for carbon storage operations and suggest that under certain conditions mineral sequestration might occur over longer migration distances and on shorter timescales than previously thought. The Australian NW shelf is a marginal rift setting which contains four basins, including the Carnarvon Basin. The Gorgon field, within the Carnarvon, is one of the largest gas fields in Australia (~ 40 TCF), with gases contained within an upthrown horst block defining the Rankin trend. Structurally, the Rankin horst block formed in response to late Triassic rifting, with later drowning of the system leading to formation of the intra Jurassic unconformity and deposition of the Muderong shale that forms the regional seal. The Rankin trend extends northward for more than a hundred kilometres to the Goodwyn and North Rankin fields. Gases of the Gorgon field are higher in CO2 than surrounding fields such as the Barrow Sub-basin and on the Exmouth Plateau. Currently it is believed that the CO2-rich Gorgon field gases migrated up and towards the southern Gorgon as a late dry charge and formed a spill chain to the north, displacing earlier, wetter gases (Longley et al, 2002). Gases of the Gorgon field have the highest CO2 concentrations among all gases in the Carnarvon Basin, with CO2 up to 16% and δ 13 C clustered between -3 to -5‰ (Figure 2). Within the Gorgon" @default.
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- W2739894961 date "2010-01-01" @default.
- W2739894961 modified "2023-09-26" @default.
- W2739894961 title "Chemical Variations of CO2 in the Rankin Trend Natural Gases, Carnarvon Basin, Australia: An Example of Mineral Sequestration?" @default.
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