Prospects in detail
The 3D seismic shows numerous sandstones encased within thick organic-rich mudstones. These prospects are vertically stacked in a number of areas, which makes them very similar to the Sea Lion, Casper, Casper South and Beverley stacked discoveries of the same age.
Stacking enables several prospects to be tested with a single exploration well. Three main stacked prospects are the Rhea Stack, Kratos Stack and Helios Stack. These are described in detail below, together with a description of Zeus, one of the 6 structural prospects.
The Rhea Stack is located to the northwest of the Sea Lion field. The reservoir objectives here are a vertically stacked sequence of Early Cretaceous turbidite sandstones derived from a major delta system to the north.
The sands are encased by thick, highly organic-rich mudstones. The water depth is 467 metres and a well to 2,900 metres will enable multiple targets to be tested.
Located in the northern part of the licence, the Kratos Stack is slightly younger and shallower than Rhea but the reservoir objectives are similar to Rhea, comprising a sequence of vertically stacked turbidite sandstones of early Cretaceous age. As at Rhea, the sands are encased in organic-rich mudstones. A well to 2,650 metres will test multiple targets.
Located in the southwestern part of the licence, the Helios Stack is younger than both Rhea and Kratos and is made up of mid Cretaceous Aptian age turbidite sandstones which have been deposited into the basin from a delta system located to the south of the licence.
An amplitude map shows a very clear series of fans spreading northwards. Helios is a sequence of thick stacked fan sandstones which have scoured into the underlying organic-rich mudstones, thereby juxtaposing reservoir sands against the source rock. Faulting beneath Helios also provides hydrocarbon migration pathways from deeper source rocks.
The Big Selene Stack is located in the northeast corner of the licence. The reservoir objectives are a mixture of vertically stacked toe-of-slope delta front sandstones, channel sandstones and basin floor fans, all of Early Cretaceous age derived from a major delta system to the north.
The sands are encased by thick, highly organic-rich mudstones. A well to 2,700 metres will enable multiple targets to be tested.