Sterling Energy (AIM: SEY) has commenced its planned 3-D seismic survey of 1,250 sq km (483 sq miles) over a high-graded portion of the Ambilobe Block offshore Madagascar, the company said in a news release.

The acquisition is being undertaken by CGG Services SA on behalf of the Joint Venture Partners, and completion is expected within 45 to 50 days.

The Ambilobe PSC, awarded in 2004, is in Phase 2 of the exploration period with all minimum work commitments for the current phase completed, the release said. Sterling and Pura Vida Mauritius each hold a 50% interest in the Ambilobe Block with Sterling as operator.