FACTBOX-Firms competing in Iraq's first bid round

June 19 (Reuters) - Thirty-two of the world's biggest energy companies have qualified and paid to compete in Iraq's first bidding round for oil and gas contracts since the U.S.-led invasion in 2003.

Iraq plans to award eight 20-year service contracts on June 29-30 to boost output at the six oilfields on offer and to develop two gas fields.

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The following is the official list of 32 companies competing: BHP Billiton (BLT.L)(BHP.AX) Marathon (MRO.N) BP (BP.L) Mitsubishi (8058.T) Chevron (CVX.N) Nexen (NXY.TO) CNOOC (0883.HK) Nippon Oil (5001.T) CNPC [CNPET.UL] Occidental (OXY.N) ConocoPhillips (COP.N) ONGC (ONGC.BO) Edison International (EIX.N) Petronas [PETR.UL] ENI (ENI.MI) Pertamina [PERTM.UL] Exxon Mobil (XOM.N) Repsol (REP.MC) Hess (HES.N) Royal Dutch Shell (RDSa.L) Inpex (1605.T) Sinochem (600500.SS) Japex (1662.T) Sinopec (600028.SS) Gazprom (GAZP.MM) StatoilHydro (STL.OL) Kogas (053000.KS) Total (TOTF.PA) Lukoil (LKOH.MM) Turkish Petroleum Corp Maersk (MAERSKb.CO) Woodside (WPL.AX) (Compiled by Simon Webb; Editing by Keiron Henderson)