SINGAPORE, Oct 28 (Reuters) - ESPO crude prices could fall as most refiners have completed their December purchases while the value of rival Oman crude has fallen on the Dubai Mercantile Exchange, traders said on Friday. "I don't see how refineries have additional demand for ESPO in December as they have already bought what they need," a trader said. Yet, stronger gasoil cracks and peak heating oil demand in winter may support the distillates-rich grade, other traders said. Tenders to sell December ESPO cargoes were issued by TNK-BP and Surgutneftgaz. DME Oman December futures plunged to a premium below $1.00 to Dubai quotes, after the contract had risen to above $3.00 last week on strong demand. * TENDERS - BP's joint venture in Russia, TNK-BP, is offering via tender two 730,000-barrel cargoes of ESPO Blend crude for loading in December, traders said on Friday. The cargoes will load on Dec. 13-16 and 20-23. The tender closes on Oct. 31. - Surgutneftgaz, Russia's fourth-largest oil producer, tendered to sell three cargoes of ESPO crude for loading in December, a trader said on Friday. The 730,000-barrel cargoes will be loaded at the Russian Far East terminal of Kozmino on Dec. 9-13, Dec. 11-15 and Dec. 16-22, he said. The tender will close on Oct. 31. * TRADES - Phibro bought four Dubai partials from Unipec at $108.20-$107.30 a barrel. - Unipec delivered one cargo of Upper Zakum to Phibro after transacting 19 Dubai partials. * OMAN ASSESSMENTS - December Oman traded on the DME fell $1.43 to a premium of 24 cents to Dubai swap quotes by 0830 GMT, using the settlement price for DME futures, the ICE one-minute marker for Singapore and the Brent-Dubai EFS as calculated by Reuters. * EFS - Front-month Brent/Dubai Exchange of Futures for Swaps (EFS) for December fell 32 cents from the previous session to $4.83 a barrel. * MARKET NEWS - An explosion caused a fire at an Iranian oil refinery on Friday and a separate incident killed one person in an oil field explosion, the semi-official Mehr news agency reported. - An increasing number of oil companies are likely to see $100-a-barrel oil as the new norm, a sign the price floor is moving up over the long run and a trend that could give a boost to stagnant merger activity in the industry. - PetroChina Co Ltd , China's second-largest refiner, has asked its refineries to run at full rates to boost fuel production and has raised diesel imports since July to overcome domestic diesel shortages. - Bangladesh's crude oil imports will rise by 17 percent to 1.4 million tonnes in 2012, with spending likely to go up by 18 percent to $1.3 billion, a senior Bangladesh Petroleum Corporation (BPC) official said on Friday. * REFINERY MARGINS - Complex processing margins for Dubai in Singapore were around $10.06 per barrel, up from an average of the last five days of $9.13, Reuters data show. Over the last year, the average margin has been around $8.02 per barrel. * CRACK SPREADS - Fuel oil's November crack narrowed 10 cents to a discount of $3.36 a barrel to Dubai crude. - Gas oil's November crack climbed 29 cents to a premium of $19.57 a barrel to Dubai crude. - The naphtha CFR Japan front-month crack shed 12 cents to a discount of $13.70 a barrel to Brent. * OUTRIGHT PRICES - December ICE Brent LCOc1 rose to $111.77 a barrel by 0830 GMT, up $1.23 from the same time a day earlier. - December Oman OQc1 fell 31 cents to settle at $106.73. (Reporting by Florence Tan and Francis Kan;Editing by Clarence Fernandez)

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