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.