UPDATE 2-Azerbaijan says not given anyone priority for gas

* Azerbaijan says not given one country preference for gas

* Socar says supports Nabucco pipeline politically

* Turkey expects 60 pct of total pipeline tax revenues

(Adds details on 15 pct "net back", investments, revenue)

By Ayla Jean Yackley

ISTANBUL, July 10 (Reuters) - Azerbaijan has not given priority to one country for gas from its Shakh Deniz fields and supports the EU-backed Nabucco pipeline project, the president of the Azeri state-owned oil firm Socar said on Friday.

The comments cast doubt over a statement made by the head of Russia's state-run gas giant Gazprom (GAZP.MM) last month when he said Azerbaijan had promised Russia priority in buying gas from the second phase of the Shakh-Deniz deposit.

"We haven't given priority to any single direction, whether it's Russia or Nabucco. We have given political support to Nabucco, we are supporters of Nabucco and give it importance, but we have to look at the conditions," Socar's Rovnag Abdullayev told reporters at a news conference in Istanbul.

Both Russia's South Stream natural-gas pipeline project and the rival Nabucco have looked to Azeri gas supplies for throughput. Abdullyev said Azerbaijan will look at the feasibility, including prices, of both routes and other planned outlets for its fuel, including Iran.

Turkish Energy Minister Taner Yildiz told the same news conference that Ankara was still negotiating with the Nabucco consortium over the price of gas it wants to keep from the link.

Turkey, which has little hydrocarbon reserves of its own, wants a 15 percent "net back" of the planned pipeline's volume.

"On the 15 percent issue, the companies have guaranteed part of supply security, but we have not agreed on the price. We have presented our conditions, this a negotiating process," he said.

The problem looks as though it will continue to linger beyond a July 13 signing of an intergovernmental transit deal in Ankara between Nabucco's partners -- Austria's OMV (OMVV.VI), Bulgaria's Bulgargaz, Turkey's Botas, Germany's RWE (RWEG.DE), Hungary's MOL MOLB.BU and Romania's Transgaz TGNM.BX.

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The 7.9 billion euro Nabucco still faces uncertainty over financing and where it will procure enough gas to fill its 31 billion cubic metre (bcm) capacity.