Mazarine Energy to acquire Black Sea Oil & Gas, operator of Romania's Midia gas project

The acquisition would add Romania's largest offshore gas producer to Mazarine's growing European portfolio while keeping Black Sea Oil & Gas in operatorship of the Midia development.

Jeremy Beckman

Nov. 10, 2026

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Why this news matters:

The deal gives Mazarine control of Romania's largest offshore gas producer and strengthens its position in the European offshore gas sector.
The Midia development is a significant contributor to Romania's domestic gas supply, accounting for 11.8% of national production during the first half of the year.

BSOG's Ana platform in the Black Sea — The Ana platform is part of the Midia gas development operated by Black Sea Oil & Gas in the Romanian sector of the Black Sea.

Mazarine Energy has agreed to acquire Black Sea Oil & Gas (BSOG) from Carlyle and the European Bank for Reconstruction and Development.

BSOG operates the Midia gas development in the Romanian sector of the Black Sea, which was sanctioned in 2019 and then came onstream in June 2022.

Facilities include the shallow-water Ana platform, a 126-km subsea export pipeline and an onshore gas treatment plant at Vadu. The project produces more than 100 MMcf/d and is said to have provided 11.8% of Romania’s total gas production during the first half of this year.

Assuming regulatory approval for the transaction, BSOG will remain operator.

Romania has emerged as one of the EU's most important indigenous gas-producing regions, with Black Sea developments playing an increasing role in regional energy security and reducing import dependence.

Earlier this year, Mazarine Energy also acquired a 50% interest in Wintershall Noordzee from Wintershall Dea GmbH, giving it entry into E&P in the Dutch North Sea.

Mazarine’s general strategy is to extend the lives of mature fields and develop stranded reserves through use of proven technology.

About the Author

Jeremy Beckman

Staff Writer / Editor, Europe

Jeremy Beckman has been Editor Europe, Offshore since 1992. Prior to joining Offshore he was a freelance journalist for eight years, working for a variety of electronics, computing and scientific journals in the UK. He regularly writes news columns on trends and events both in the NW Europe offshore region and globally. He also writes features on developments and technology in exploration and production.