ExxonMobil in Angola: Block 15, Kizomba Complex and Legacy

ExxonMobil: Block 15 and the Kizomba Legacy

ExxonMobil Corporation, through its subsidiary Esso Exploration Angola (Block 15) Limited, operates Block 15 in the deepwater Lower Congo Basin—one of Angola’s most prolific offshore concessions and home to the Kizomba complex of producing fields. ExxonMobil’s Angolan operations, while smaller in scale than those of TotalEnergies or Azule Energy, represent a significant deepwater production hub with ongoing exploration potential, as demonstrated by the Likembe discovery in 2024.

Block 15 Operations

Concession Overview

Block 15 is located approximately 250 to 350 km northwest of Luanda in the deepwater Lower Congo Basin, in water depths of 600 to 1,400 metres. ExxonMobil operates the block with a 40 percent working interest, with partners including Sonangol, BP (now through Azule Energy), and Eni (now through Azule Energy).

The block has been one of Angola’s most successful deepwater exploration and development stories, with multiple world-class discoveries made since the late 1990s.

Kizomba FPSO Complex

Block 15’s production is centred on the Kizomba FPSO complex, comprising three FPSOs:

Kizomba A FPSO (2004): The first FPSO in Block 15, developing the Hungo and Chocalho fields. Kizomba A was one of the largest FPSOs in the world at commissioning, with production capacity of 250,000 bpd. The FPSO was built at the Hyundai Heavy Industries shipyard in South Korea and has been producing for over two decades.

Kizomba B FPSO (2005): Developing the Kissanje and Dikanza fields, with production capacity of 250,000 bpd. Kizomba B operates in water depths of approximately 1,100 to 1,200 metres.

Kizomba Satellites FPSO (2012): A third FPSO developed to process production from satellite fields and incremental discoveries within the Block 15 development area. The Kizomba Satellites FPSO extended the development’s productive life by accessing reserves in smaller accumulations that could not justify standalone development.

Together, the three Kizomba FPSOs have a combined nameplate capacity exceeding 700,000 bpd, though actual production has declined significantly from peak levels as the fields mature. Current gross Block 15 production is estimated at 120,000 to 180,000 bpd.

Likembe Discovery (2024)

In 2024, ExxonMobil announced the Likembe discovery in Block 15, a significant find that demonstrates the block’s continued exploration potential. The Likembe well, drilled to test a pre-salt prospect, encountered a substantial hydrocarbon column in high-quality reservoir sands.

The Likembe discovery is noteworthy because:

1. Pre-salt potential: The discovery proves the pre-salt play in Block 15, potentially opening a new geological horizon beneath the proven post-salt turbidite reservoirs that host the Kizomba fields.
2. Infrastructure synergies: Likembe’s proximity to the existing Kizomba FPSO complex allows for potential tieback development, reducing capital cost and time to first oil.
3. Resource potential: While official resource estimates have not been published, industry analysts estimate Likembe at 200 to 500 million barrels of recoverable oil, which would make it one of the largest discoveries in Angola in recent years.

The appraisal programme for Likembe is expected to include one to two additional wells to delineate the accumulation and confirm reservoir properties. If commercial, development could proceed as a subsea tieback to one of the existing Kizomba FPSOs, with Decree 8/24 fiscal terms potentially applicable to incremental volumes.

Production and Reserves

Current Production

ExxonMobil’s net production from Angola (Block 15) is estimated at approximately 50,000 to 70,000 bpd, representing approximately 1.5 to 2 percent of the company’s global production of approximately 3.7 million boed. While Angola is not among ExxonMobil’s largest producing countries (Guyana, the Permian Basin, and Qatar take precedence), Block 15 remains a material contributor to the company’s deepwater portfolio.

Reserves and Resources

Block 15’s remaining proved reserves are in the range of 200 to 400 million barrels, supporting continued production through the 2030s. The Likembe discovery has the potential to add 200 to 500 million barrels of contingent resources, pending appraisal results and commercial declaration.

ESG and Environmental Management

ExxonMobil’s ESG approach in Angola reflects its global corporate standards:

• Emissions management: ExxonMobil reports Scope 1 and Scope 2 emissions from its global operations, including Angola. The company has set a target to achieve net-zero Scope 1 and Scope 2 emissions from its operated assets by 2050.
• Methane reduction: ExxonMobil has committed to reducing methane intensity from its operated assets, though it follows its own methane reporting framework rather than OGMP 2.0.
• Environmental monitoring: Block 15 operations include marine environmental monitoring programmes covering water quality, sediment quality, and marine ecology.
• Decommissioning planning: Given the age of the Kizomba FPSOs (commissioned 2004-2012), decommissioning planning is an increasingly relevant consideration. The PSA governs the allocation of decommissioning costs between ExxonMobil, its partners, and the Angolan state.

Workforce and Local Content

ExxonMobil employs approximately 500 to 1,000 staff directly in Angola, with additional personnel through contractors. The company’s workforce is predominantly Angolan, in compliance with local content requirements, with expatriate positions limited to specialised technical and management roles.

ExxonMobil sponsors scholarship and training programmes for Angolan nationals in petroleum engineering and related disciplines, contributing to the country’s long-term human capital development.

Strategic Context

ExxonMobil’s Global Portfolio Prioritisation

ExxonMobil’s global strategy since 2019 has been characterised by heavy capital allocation to its highest-return assets—the Permian Basin in West Texas/New Mexico, the Stabroek Block in Guyana, and LNG projects in Mozambique, Papua New Guinea, and Qatar. Angola, while profitable, does not rank among ExxonMobil’s top-tier growth assets.

This portfolio prioritisation raises the question of ExxonMobil’s long-term commitment to Angola. Several scenarios are possible:

1. Continued operation: ExxonMobil continues to operate Block 15, investing in incremental production under Decree 8/24 and developing the Likembe discovery if commercial. This is the most likely near-term scenario.

2. Partial divestment: ExxonMobil sells a portion of its Block 15 interest to a partner, reducing its capital commitment while retaining exposure to the Likembe upside. This model has been used by ExxonMobil in other mature basins. Our upstream M&A deals and valuations article tracks recent transaction comparables.

3. Full exit: ExxonMobil exits Angola entirely, selling its Block 15 interest to another operator. This would require ANPG approval and would be a significant event for Angola’s petroleum sector.

The Likembe discovery strengthens the investment case for continued presence, as a 200+ million barrel discovery in a proven deepwater basin with existing FPSO infrastructure is precisely the type of opportunity that justifies ongoing investment.

Implications for Angola

For ANPG and the Angolan government, ExxonMobil’s continued engagement in Block 15 is important for maintaining production from one of the country’s major deepwater assets. The Likembe discovery provides a tangible reason for ExxonMobil to invest further, and the Decree 8/24 fiscal terms are designed to make such investments attractive.

Conclusion

ExxonMobil’s Angolan presence, centred on the Kizomba complex in Block 15, represents one of the most successful deepwater developments in African petroleum history. The three FPSOs have produced billions of dollars in revenue for Sonangol, the Angolan government, and ExxonMobil’s shareholders over two decades. The Likembe pre-salt discovery in 2024 provides a potential catalyst for the next phase of Block 15 development, while the Decree 8/24 fiscal terms incentivise incremental recovery from the mature Kizomba fields. Whether ExxonMobil chooses to deepen its Angola commitment or gradually reduce exposure will depend on the Likembe appraisal results and the company’s broader global portfolio prioritisation.