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The Ketch, Schooner and Topaz fields were discovered between 1984 and 1987 and produced from Upper Carboniferous, Westphalian C/D (Bolsovian/Asturian) reservoirs. Gas production began in 1996, 1999 and 2009 for Schooner, Ketch and Topaz respectively. The low net-to-gross reservoir consists of discrete, low sinuosity fluvio-deltaic channels evolving upwards into an aggradational, distal fluvial fan setting, dominated by braided channels. Fault compartmentalization and variable sandbody extent mean that reservoir connectivity was a key subsurface uncertainty. The Ketch and Schooner fields gas-in-place estimates at development approval of 956 and 1021 bcf are now modelled as 581 and 654 bcf respectively. This...

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