Tern oilfield
UK oil field
Platform Name - Tern Alpha.
The Tern oilfield is an oilfield situated 169 kilometres (105 mi) north east of Lerwick, Shetland Islands, Scotland, in block numbers 210/25a.
History
The Tern field was discovered in April 1975 by well 210/25-1, drilled by semi-submersible rig Sedco 135G in a water depth of 167 metres (548 ft). It started production in 1989. Until July 2008, the oilfield was operated by Royal Dutch Shell and licensed by Shell/Esso. On 7 July 2008, it was purchased by TAQA Bratani, a subsidiary of the Abu Dhabi National Energy Company, along with the Eider, North Cormorant, Cormorant Alpha, Kestrel and Pelican fields and related sub-sea satellite fields.
Reserves and geology
Estimated recovery of Tern oilfield is 175 million barrels (27.8×10^6 m3) of oil. The oil has a gravity of 34°API.
Structurally, it is a triangular uplifted block of the Brent Group bounded by NNW-SSE and NNE-SSW trending faults and sealed by overlying Kimmeridge Clay (the dominant source rock, with debated contributions from the much deeper Old Red Sandstone) and Shetland Group mudstones.
Tern oil platform
The Tern oil platform is a steel jacket production and drilling platform. It was built by RGC Offshore at Methil yard and was installed in May 1988.
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