By Jenny Gross

LONDON--Cnooc Ltd.'s (CEO) proposed bid for Canadian oil-and-gas producer Nexen Inc. (NXY) would increase Asia's sway and influence over the pricing of Brent crude, the global oil benchmark, market analysts said Tuesday.

The proposed takeover, which would be China's biggest foreign acquisition, would put the largest crude stream that feeds into the physical Brent benchmark into Chinese hands. This would mean exclusive insight into North Sea production issues and maintenance that will affect the price of Brent crude and other crudes priced off of it.

"China will be able to leverage much more than Nexen the knowledge and trading advantage of running that field," said Olivier Jakob, managing director of Swiss-consultancy Petromatrix, in a note.

The deal, announced Monday, came within hours of another state-backed Chinese company, China Petroleum & Chemical Corp., better known as Sinopec (0338.HK), agreeing to acquire a 49% stake in U.K. North Sea assets owned by Canada's Talisman Energy Inc. If completed, the two deals would give the companies roughly an 11% share of the U.K.'s oil and gas production.

Price reporting agency Platts said it was too soon to speculate what impact this would have on the Brent market.

"Platts is following this deal, as it would with any major market event, and continues to be in regular contact with all key stakeholders on any matters related to the Brent crude oil benchmark," Platts said in a statement emailed to Dow Jones Newswires.

Cnooc would be unlikely to use its new influence over North Sea crude to manipulate the market, said Torbjorn Kjus, oil market analyst at DnB NOR. The potential deal rather highlights the general issue of Brent being heavily affected by North Sea production issues, and a new benchmark would be needed to better suit global markets, he said.

The acquisition would not only increase China's say in the Brent benchmark, but would also give it access to Nexen's expertise in shale gas plays in North America. This is would be a big gain for Cnooc, which hopes to develop shale gas domestically, but is currently far behind in technology needed to do so, said Eugene Lindell, senior market analyst at JBC Energy.

"If China can manage to mirror issues at home with shale oil, that would be massive," Mr. Lindell said.

Write to Jenny Gross at jenny.gross@dowjones.com; Twitter: @jgginlondon (Sarah Kent and Konstantin Rozhnov in London contributed to this report.)

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