Abstract
Abstract The SW Kinsale gas accumulation is located in blocks 48/20 and 48/25 in the North Celtic Sea Basin, 50 km off the south coast of Ireland. The field lies in c. 100 m of water. The discovery well, 48/25-2, was drilled in 1971 and encountered gas-bearing fluviatile sandstones in the Lower Cretaceous Wealden sequence. In 1995, well 48/25-3 was drilled close to the discovery well on the southwestern limb of the Kinsale Head anticline, which is thought to have formed during Tertiary basin inversion. The well data indicate that this southwestern area is in pressure isolation from the main Kinsale Head Field, which lies in the central and eastern sectors of the structure. In 1997 a 3D seismic survey was acquired to assess the suitability of the field as a potential gas storage site. These data suggest that SW Kinsale is in structural isolation from the main Kinsale Head Field. Mapping of the 3D volume reveals SW Kinsale to comprise a relatively simple low-relief anticline. There is c. 160 m of closure from −810 m true vertical depth sub-sea (TVDSS) at its crest to −968 m TVDSS along a syncline to the north. The accumulation is thought to have a shared gaswater contact with the main Kinsale Head Field at −945 m TVDSS, beneath which lies a transition zone to −968 m TVDSS. The area within closure is close to 1200 ha. These data also suggest that the reservoir has undergone a minimal degree of structural compartmentalization. A major Wealden channel axis is interpreted to transect the field. Southwest Kinsale is thought to contain 1.1–1.4 BCM (billion cubic metres) gas initially in place with about 0.85 BCM recoverable. The field was recently developed as a single well sub-sea tieback to the Kinsale Bravo platform. First gas deliveries from the field took place in late 1999.
Published Version
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