DUBAI, June 28 (Reuters) - Major petrochemicals producer Saudi Basic Industries Corp (SABIC) has agreed with national oil giant Saudi Aramco to conduct a joint feasibility study on a proposed oil-to-chemicals project, SABIC said on Tuesday.

SABIC had previously revealed plans for the proposed project in May. It has said the complex, at the Red Sea city of Yanbu, could cost as much as $30 billion, processing petrochemicals directly from crude oil instead of first refining the oil into products such as naphtha. It would be the first time that the two companies teamed up on a major project in Saudi Arabia. SABIC did not say when the feasibility study might be completed.

(Reporting by Hadeel Al Sayegh; Editing by Andrew Torchia) ((Hadeel.AlSayegh@thomsonreuters.com; +971566883310;))