Exploration History
The first exploration well on the PL053 license, 30/6-1, was drilled as a wildcat and spudded on 19 June 1979. The well was plugged and abandoned as a gas discovery on 22 September. Subsequent appraisal wells proved oil in addition to the gas found by the discovery well and Oseberg was produced as an oilfield. The first exploration well on the PL079 license, 30/9-1 was drilled as a wildcat at the end of 1982, but treated as an appraisal after it encountered oil and gas considered to form part of the same accumulation. In 2006, well 30/9-B-19 A proved reserves in the underlying Upper Triassic to Lower Jurassic Statfjord formation. Tests are also being carried out on the overlying Upper Cretaceous Chalk Group reservoir to evaluate the flow characteristics.
The vertical gas column in the Alpha block was 380 m while the underlying oil column was about 215 m before production began.
A total of 31 exploration and appraisal wells have been drilled on the Oseberg structure, although this includes sidetracks and re-entries. Of these wells, only three proved 'dry'.
Read more about this topic: Oseberg Oil Field
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