Meanwhile recent maintenance shutdowns in the North Sea have worsened already declining supplies from ageing fields of Brent crude.

同时最近北海油田的停工维护也使得布伦特原油这片开采已久，原本已经供应量下降的油田更加雪上加霜。

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The cost of a barrel of North Sea Brent crude hit a record before pulling back Thursday when priced in euros and British pounds, two currencies that have been weakening of late.

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North Sea Brent and WTI, the two benchmark crude oils are both sweet, light.

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It is assessing two kinds of North Sea crude oils that are like Brent called Troll and Duc and is analyzing the need for additional escalators in the assessment process, like adding more grades to the Brent mechanism.

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