UPDATE 1-Belarus in plants sale talks with Rosneft, LUKOIL

(Adds detail, more quotes, background)

MINSK, Aug 1 (Reuters) - Belarus is discussing the privatisation of Naftan oil refinery and Polimir petrochemical company with Russian oil majors Rosneft (ROSN.MM: Quote, Profile, Research) and LUKOIL (LKOH.MM: Quote, Profile, Research), Belarus first deputy prime minister said on Friday.

"We are in talks on Naftan and Polimir with Rosneft and LUKOIL. The investor must have feedstock to supply the plants and markets to sell production. LUKOIL might become a wonderful partner," Vladimir Semashko told a briefing.

Belarus said it was planning to sell 50 percent in a combined company that would unite Naftan and Polimir plants with connected technology processes. The government is planning to carry out a pre-sale international audit of the companies.

Semashko said the main option considered is creating a 50-50 joint venture but gave no financial details of the deal.

He added the government was expecting the oil companies to present their business plans in autumn.

Naftan, one of Belarus's two refineries, processed around 200,000 barrels per day last year. (Reporting by Andrei Makhovsky in Minsk, Writing by Tanya Mosolova in Moscow; Editing by Mike Nesbit)