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Amethyst is a natural gas field in the Southern North Sea, about east of the Yorkshire coast. Gas lies in a Permian sandstone reservoir around below the seabed. The gasfield is operated by BP.〔 〕 ==History== The gasfield was discovered in 1972 and it was named after HMS ''Amethyst''.〔〔 〕 Between 1972 and 1985 a number of appraisal wells were drilled. The field development started in 1988 and the first gas was produced in 1991.〔 Originally, the field was owned by BP, Enterprise Oil, British Gas, ARCO, Murphy Oil, Amerada Hess, and FINA. In 1997, BP acquired the interest of Enterprise Oil and became the largest stakeholder of the field.〔 〕 As a result of restructuring and several transactions the field became hold by BP (59.5%), BG (24.15%), Centrica (8.95%), and Murphy Oil (7.4%).〔 In December 2009, BP and BG agreed an assets swap by which BP took over BG's interest in the field.〔 〕 In September 2007, three crew members of the emergency response and rescue vessel ''Viking Islay'', operated by Vroon Offshore Services, were killed during a support operation on the Amethyst gasfield.〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Amethyst gasfield」の詳細全文を読む スポンサード リンク
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