Corallian Energy Limited spudded appraisal well 98/11a-6 on the Colter discovery locater in licence P1918 on 6 February 2019. In an update on 25 February 2019 partner, United Oil and Gas plc announced that the well had reached TD in the Sherwood Sandstone at 1,870 m. The well remained (unexpectedly) on the southern side of the Colter prospect bounding fault but encountered oil and gas show over a 9.4 m section at the top of the Sherwood Sandstone reservoir, this is separate to the original appraisal target. Petrophysical evaluations indicate net pay of 3 m. Similar indications of oil and gas shows were encountered in the 1983 well â 98/11-1. It is thought that the two wells may share a common oil-water contact having both intercepted the down-dip margin of the Colter South prospect. On 25 February 2019 Corallian kicked-off sidetrack 98/11a-6Z targeting the Sherwood Sandstone target within the Colter prospect on the northern side of the bounding fault. In an update from partner Reabold Resources on 8 March 2019 it confirmed that the sidetrack had been completed after being drilled to 1,910 m (MD). The sidetrack encountered the Sherwood Sandstone below the Oil-Water contact. It did encounter oil and gas shows in the Jurassic Cornbrash-Lower Oxfordian interval as seen at the Kimmeridge field. Operations are now complete and a review of the data from the operations will be undertaken with a view for the future to focus on the Colter South section of the area.   The Colter discovery was made by BP in 1986 where 41.9Â° API was recovered on test from a 10.5 m oil column. Through the merging and reprocessing of 3D seismic Corallian has mapped 100 m of vertical relief up-dip of 98/11-2. Well costs are in the region of GBP 7 million. Corallian announced on 28 September 2018 that it had contracted the âEnsco-72â for the well.   Licence P1918 was initially awarded to Infrastrata from the 26th Seaward Licensing Round prior to Corallian taking the acreage. The company reprocessed 156 km of 2D seismic and 33.5 sq km of 3D seismic over the licence. It is thought that Colter could hold mean prospective resources of 22 MMbo (recoverable).     Interest in P1918 following completion of two deals will be held by Corallian Energy Limited (34% + operator), Corfe Energy Limited (40%), United Oil and Gas Plc (10%), Andalas Energy and Power (8%) and Baron Oil Plc (8%).
098/11a-06 Z (Colter ST) (Coralian op. 49%, Corfe Egy. 25%, UOG 10%, Resolute O&G 8%, Baron Oil 8%) in P1918 / block 98/11a off the Dorset coast, intersected the target Sherwood sst. fm below the oil-water contact. In addition, the side-track encountered oil and gas shows in the Jurassic Cornbrash-Lower Oxfordian interval, the producing reservoirs in the Kimmeridge oilfield, and this provides an interesting potential target on trend to the west within the onshore licences