ASTANA, Jan 29 (Reuters) - Kazakhstan plans to hold

preliminary consultations with the country's biggest oil

producer, Chevron ( CVX )-led Tengizchevroil, on revising

production sharing agreements (PSAs), Energy Minister Almasadam

Satkaliyev said on Wednesday.

Speaking at a briefing a day earlier, Satkaliyev had said

that the state might raise its share in oil projects developed

by international energy firms, change operators or renegotiate

contracts.

President Kassym-Jomart Tokayev on Tuesday ordered the

government to step up talks with international oil companies

about an extension of existing PSAs on "better terms".