Royal Dutch Shell is seeking to sell its gas fields in Tunisia for some $500m, sources said, as the Anglo-Dutch company pushes forward with its vast disposal program, Reuters reported.

According to EP Magazine, the Tunisian assets were acquired as part of Shell’s $54b take over of BG Group in 2016 and account for about 65% of the North African country’s gas production.

Two offshore gas fields, Miskar, fully owned by Shell, and Hasdrubal, 50% owned by Shell, in addition to an onshore production facility, are included in the assets to be sold by the company.

In 2015, the fields produced 30,000boe/d. Reuters contacted a Shell Spokeswoman who declined to comment on the asset sales and the value of the operations.

Shell has sold or agreed to sell more than $20b in assets over the past year as part of a $30b divestment program aimed at reducing debt following the BG acquisition.