Mamba South

Mamba South Oil and Gas Field Profile

Location

The Mamba South Oil and Gas Field is located offshore Mozambique, specifically in the Rovuma Basin, within Block Area 4. The field is situated in ultra-deepwater, with the discovery wells at various water depths:

• Mamba South 1: 1,585 meters.
• Mamba South 3: 1,571 meters.

Operator and Ownership

The field is operated by Eni S.P.A, although the ownership structure has evolved:

• Initially, Eni held a 70% stake, with Galp Energia (10%), KOGAS (10%), and ENH (10%).
• Current ownership includes Eni S.P.A. (25.0%), ExxonMobil (25.0%), Empresa Nacional de Hidrocarbonetos de Mozambique (20.0%), and other partners (30.0%).

Discovery and Development

• The Mamba South field was discovered in 2011.
• The discovery was part of a series of finds in the Mamba complex, including Mamba North and Mamba North East, made between 2011 and 2012.

Reserves

• The Mamba South field is part of the larger Mamba complex, which is estimated to have approximately 75 trillion cubic feet (tcf) of gas in place.
• Specific reserve estimates for Mamba South include:
  • Gas reserves: Approximately 424.7 million cubic meters (as of 2012 and 2018 estimates).
  • Gas resources: 624.5 million cubic meters (as of 2021).
  • Liquids resources: 51 million barrels (as of 2021).

Production

• The field is currently in the development phase, with commercial production expected to start in 2028. The Final Investment Decision (FID) is anticipated in 2025.
• Peak gas production from the Mamba Complex, which includes Mamba South, is forecast to occur in 2029, with production continuing until the field reaches its economic limit in 2057.

Geology

• The field is characterized by Oligocene and Paleocene sands.

Technical Details

• The development of the Mamba Complex involves drilling approximately 24 wells, along with the installation of subsea manifolds and subsea trees.
• The project is technically complex due to its ultra-deepwater location, with water depths ranging from 1,571 to 1,585 meters.

Economic and Project Details

• The development cost of the Mamba Complex is estimated to be around $23 billion.
• The project involves several key contractors, including ERM Group, Impacto, and Projectos e Estudos Ambientais.

Environmental and Social Impact

• Eni and its partners are involved in various local development initiatives, including forest protection, biodiversity conservation, education, healthcare, and economic diversification. These efforts are part of a broader strategy to support the local community and environment.

In summary, the Mamba South Oil and Gas Field is a significant component of the Mamba complex, one of the world's largest offshore gas projects, located in the Rovuma Basin of Mozambique. The field is operated by Eni and involves multiple international partners, with production expected to commence in 2028.