"We continue to see that as a mechanism that we could use to grow value in the portfolio," BHP's petroleum operations president, Geraldine Slattery, told analysts at a briefing, when asked about mergers and acquisitions.

She was speaking at a briefing where the company, which has had to fight off pressure from some investors to shed its petroleum business over the past few years, said it expects strong returns from oil and some gas assets for the next few decades.

(Reporting by Sonali Paul; Editing by Himani Sarkar)