India will appeal against a ruling by an international tribunal in favour of Reliance Industries (RIL) in a dispute over gas migration from fields operated by state-run explorer Oil and Natural Gas Corp (ONGC), Union Petroleum Minister Dharmendra Pradhan said on Friday.

Last week, a three-member international arbitration tribunal rejected the government's $1.55 billion claim against RIL and held that the company could contractually produce and sell any gas that might have migrated from adjoining fields of ONGC into its area and Reliance was not obligated to seek prior government permission for doing so.