Spot premiums for August-loading Upper Zakum crude cargoes jumped after BP placed a bid for a cargo on Platts window at 40 cents a barrel above its OSP, they said.
Before the window, Exxon Mobil sold some Upper Zakum cargoes at 40 cents a barrel above its OSP, one of the sources said.
Upper Zakum was earlier valued at 15-20 cents above its OSP.
Shell received its seventh Upper Zakum crude cargo from Unipec at the end of Wednesday's window.
Most of the August-loading Qatar Marine crude cargoes have been sold and they traded at a small premium to about 10 cents a barrel above its OSP, traders said.
Japanese refiner Fuji Oil bought an August-loading cargo of Murban crude on Wednesday at a premium slightly above 10 cents a barrel to its OSP.
Formosa bought late on Tuesday Oman crude via a tender at $2.20-$2.30 a barrel above Dubai quotes.
ASIA-PACIFIC CRUDE: PetroleumBrunei has sold two Kimanis crude cargoes via a tender, traders said. The cargo loading on Aug. 1-5 was sold at a discount to its OSP, while the second cargo, loading on Aug. 30-Sept. 3, was sold at a premium.
Petronas offered one cargo each of Bunga Orkid and Bunga Kekwa for August loading in a tender.
ARBITRAGE
Heavy crudes have poured into the United States this spring, offsetting the loss of Venezuelan oil and producing a mini-surplus, with Canadian heavy crude this month being exported from the US Gulf Coast.
The tanker New Dream, chartered by Mercuria, departed on June 16 from Galveston loaded with more than 1 million barrels of heavy Canadian crude, and is headed to Asia, according to vessel tracking data from Refinitiv Eikon and ClipperData.
WINDOW: Cash Dubai's premium to swaps fell 18 cents to $2.13 a barrel despite Shell's purchase of 40 August Dubai partials.