Well 15/12-18S had two drilling targets, one in the Paleocene (the Storskrymten prospect) and one in the Jurassic/Triassic (the Grytkollen prospect). In the Paleocene, 23 meters of oil was found in sandstones with good reservoir properties belonging to the Ty formation. Nine-meter thick sandstones were also encountered in the Jurassic (Grytkollen), but no oil or gas was proven here.
The well was drilled to a total measured depth of 3520 meters and concluded in rocks from the Permian Age. Oil and rock samples were taken in the Ty formation for further analysis.
Appraisal well 15/12-18A encountered sandstones in the Ty formation. However, these were somewhat deeper than the oil-water contact proven in the original well, and did not contain oil or gas.
The well did, however, prove a new oil discovery in Paleocene sandstones in the Heimdal formation. The sidetrack was drilled to a total measured depth of 3036 meters and was concluded in rocks from the Late Cretaceous.
The operator has estimated the total size of the two discoveries to be from 1.5 - 7 million standard cubic meters of recoverable oil.
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