Royal Dutch Shell has agreed to sell its onshore assets for $587m to Assala Energy Holdings, a Carlyle Group company run by former Tullow Oil and Perenco executives, as part of its divestment programme following the BG acquisition.The sale involves all of Shell’s onshore oil and gas operations and related infrastructure in Gabon, namely five operated fields (Rabi, Toucan/Robin, Gamba/Ivinga, Koula/Damier and Bende/M’Bassou/Totou), shares in four non-operated fields (Atora, Avocette/M’Boukou, Coucal and Tsiengui West) and the onshore pipeline system from Rabi to Gamba and the Gamba Southern export terminal.