Central Graben
24 May 2018

HPHT exploration well on Thunderer; horst block with Joanne Sandstone primary objective requiring sealing below Jonathan Mudstone. Gas/condensate proved in three reservoirs. Mackerel (Hod) chalk from 12,784–13,086 ft TVDSS in eastern extension of Ockley discovery; no samples taken. Pentland (14,422–14,513 ft TVDSS), with 43 ft net pay with 37.9°–38.9° API condensate. Upper part of Josephine Sandstone, subcropping Pentland water-wet, but gas in deeper sand with 40.1° API condensate. Good quality reservoir in Joanne (15,376 ft TVDSS), but water-wet with no shows. Post-well analysis indicates Joanne not located on viable migration route.

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