A successful test has been performed of the production properties of the Gohta discovery in production licence 492. Preliminary estimates provided by the operator indicate volumes between 113 and 239 million barrels of oil equivalents. Det norske holds a 40 percent interest in the licence.
Lundin Norway AS, the operator of production licence 492, has completed the drilling and testing of wildcat well 7120/1-3. The well proved oil in contact with an overlying gas cap.
The discovery has been made on the Gohta prospect, situated approximately 35 kilometres northwest of the Snøhvit field in the Barents Sea.
The purpose of drilling the well was to prove petroleum in the reservoir rocks Triassic sandstones and Permian carbonates. The well encountered a 25-metre gas cap over a 75-metre oil column in karstified and dolomitized carbonate rocks. The Triassic sandstone was water bearing.
The oil/water contact was encountered at 2,365 metres below mean sea level. The reservoir has been cored and logged, and fluid samples have been collected.
A drill stem test has been carried out to establish the quality of the reservoir. The test showed a stable production rate, through a 44/64″ fixed nozzle, of 683 Sm3(4,296 barrels) per day and an associated gas production of 222,300 Sm3per day. The gas/oil ratio was 325 Sm3/Sm3.
The test clarified the production properties of the reservoir in a positive way. This is the first successful testing in Permian carbonates performed on the Norwegian shelf.
The operator’s preliminary estimates range between 10 and 23 million standard cubic metres (Sm3) of recoverable oil and 8 – 15 billion Sm3 of recoverable gas. The results confirm oil and gas for the first time in this play. Further appraisal of the discovery will be considered.
Lundin Norway is the operator of production licence 492 with a 40 percent interest. Partners are Det norske oljeselskap ASA with a 40 percent interest and Norwegian Energy Company ASA, holding a 20 percent interest.
This is the first exploration well in production licence 492. The licence was awarded in APA 2007.