By Cassie Werber

LONDON--A drop in volumes from the U.K.'s largest North Sea oil field, which has led to the delay of some crude-oil cargoes, is unrelated to operational issues at the Kinneil terminal, according to a person with knowledge of the situation.

The Buzzard field produces around 200,000 barrels of oil a day at capacity, but production is now running at around 80,000 barrels a day, according to a London-based oil trader.

The importance of the field to the U.K. economy was apparent in January's fourth-quarter gross domestic product data, which showed that Buzzard's prolonged total closure in late 2012 contributed to the economy shrinking more than expected in the final three months of the year.

The current fall in production has been linked to an operational issue at Kinneil, a terminal operated by BP PLC (BP) that is at the end of the Forties Pipeline System, the main conduit for North Sea oil to be transferred to land.

However, the person told Dow Jones Newswires that the Buzzard shortfall isn't linked to the operational issue at Kinneil.

Nexen Inc. (NXN), which operates Buzzard, hadn't responded to requests for comment at the time of publication.

The Kinneil Terminal is capable of processing 1.15 million barrels a day of crude oil, according to BP's website. The most recent data from the U.K. Department of Energy and Climate Change shows the U.K.'s maximum monthly crude-oil production at 5 million barrels in 2012.

Oil traders, meanwhile, said that seven cargoes of Forties crude had been delayed until later in the month because of the lower volumes of oil leaving Buzzard, although there was as yet no obvious impact on oil prices.

Cargoes FO219, FO302, FO304, FO306, FO307 and FO309 and have all been delayed for between one and four days. Cargo FO303, originally due to begin loading March 5, has been deferred to March 15.

Traders said that the lower volumes could have the effect of pushing up prices.

"[The] Buzzard shortage is bullish yes, but [we are] not seeing that in the price yet," a trader said.

Other factors were weighing more heavily on the Brent price, the trader said, with the low price of Mediterranean crude forcing the price of North Sea grades down as well.

"With Urals so cheap, [it] has dragged down the Forties market to cheaper levels," the trader said.

Maintenance is scheduled for mid-March at Buzzard, which traders said will likely have a further effect on volumes.

Write to Cassie Werber at cassie.werber@dowjones.com

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