ABU DHABI, Nov 28 (Reuters) - State-owned Abu Dhabi National Oil Co (ADNOC) ADNOC.UL plans to almost triple its petrochemical production to an annual 11.4 million tonnes from 4.5 million tonnes by 2025, group chief executive Sultan Al Jaber said on Monday.

"To achieve this we will seamlessly integrate our petrochemical and refining business, and as supplies of gas become tighter, we will expand our feedstock beyond ethane to include naphtha," Jaber said in a speech at an energy industry conference.

(Reporting by Maha El Dahan; Writing by Andrew Torchia) ((andrew.torchia@thomsonreuters.com; +9715 6681 7277; Reuters Messaging: andrew.torchia.thomsonreuters.com@reuters.net))