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Petrobras leads the largest investment ever made in underwater seismic monitoring in the world, with a network of sensors and optical cables installed two thousand meters deep in the Santos Basin to monitor in real time the movement of oil in the pre-salt reservoirs.
Petrobras has just taken a step that repositions Brazil on the map of deep-water oil exploration technology. With an investment of around US$ 450 million approximately R$ 2.2 billion, the state-owned company and its partners in the Libra Consortium are implementing the largest permanent seismic monitoring system ever built on the ocean floor. The infrastructure acts like a gigantic “ultrasound” of the seabed, capable of mapping geological structures and tracking the movement of oil, gas, and water in the pre-salt reservoirs.
The project is unprecedented in deep waters and directly targets the Mero field, one of the largest oil producers in the country. The operational area extends across the Santos Basin, with connections reaching regions linked to the states of Rio de Janeiro, São Paulo, Santa Catarina, and Paraná. The first phase is already in operation, and the first data is expected to start being collected in the second quarter of 2026. When completed, the system will provide Petrobras with a continuous and detailed view of reservoir behavior, something that no other oil company in the world possesses on this scale.
460 kilometers of cables on the seabed: how Petrobras’ system works
The backbone of the project is the Permanent Reservoir Monitoring System. According to information from the portal ndmais, in practice, it consists of a network of sensors and optical instruments installed directly on the ocean floor, at depths reaching two thousand meters. These sensors capture seismic waves and transform the signals into detailed images of what happens below the seabed.
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The first stage was completed in March of this year. More than 460 kilometers of cables with optical sensors have been installed, covering an area of 222 square kilometers. This entire network is already connected to two FPSOs, the floating production, storage, and offloading platforms named Guanabara (Mero 1) and Sepetiba (Mero 2). It is through these vessels that the data will initially be processed, using computers installed on board.
The second phase will expand coverage and connect two more platforms
Petrobras did not stop at the first stage. The second phase of the project is already underway and plans to install more 316 kilometers of seismic cables. As a result, the monitored area will be expanded by 140 square kilometers, reaching the regions operated by the FPSOs Duque de Caxias (Mero 3) and Alexandre de Gusmão (Mero 4).
When the two phases are fully integrated, the system will have the largest extension of underwater seismic monitoring cables in the world. The completion of the entire infrastructure is expected next year. The reach of this network will allow monitoring the behavior of pre-salt reservoirs over time, which is essential for operational decisions involving billions of reais in daily production.
What changes in oil production with this investment from Petrobras
The most direct impact of the system is the ability to optimize real-time production management. Today, decisions on how to extract oil from pre-salt reservoirs depend on periodic seismic surveys conducted by specialized ships that traverse the area and emit sound waves towards the seabed. This process is expensive, time-consuming, and provides only snapshot images of the reservoir.
With continuous monitoring, Petrobras gains access to a continuous flow of information. It’s like replacing a static X-ray with a real-time imaging exam. The expectation is that this precision will allow for an increase in the oil recovery rate, meaning extracting more oil from each well without the need to drill new fields or significantly increase pollutant gas emissions.
For a company that produces more than two million barrels per day, each additional percentage point in recovery represents billions in revenue.
Artificial intelligence will interpret the data in partnership with UFRJ
The amount of information generated by hundreds of kilometers of sensors on the ocean floor is colossal. To handle this volume, Petrobras has partnered with the Federal University of Rio de Janeiro (UFRJ). Together, the teams will use artificial intelligence to continuously analyze seismic data, identifying patterns and anomalies that would be impossible to detect with conventional methods.
This collaboration has a dual impact. In the scientific field, the data will feed research on the geology of the Brazilian pre-salt, one of the most complex and productive exploratory environments on the planet. In the operational field, AI will function as an alert system, capable of anticipating production problems and increasing the safety of operations.
In the future, data transmission will be done via fiber optic directly to the company’s headquarters in Rio de Janeiro, eliminating the exclusive dependence on processing aboard the platforms.
Why the Petrobras project in the pre-salt matters beyond oil
The decision to invest R$ 2.2 billion in a monitoring system of this magnitude is not just a bet on productive efficiency. It is a clear signal that Petrobras is playing the long game in the pre-salt.
The reservoirs of this geological layer concentrate the largest oil discoveries in Brazil over the last two decades, and the ability to monitor them accurately can be the difference between sustainable exploration and resource waste.
Moreover, the project places Brazil at the global forefront of a technology that can be replicated by other oil companies around the world. No other permanent seismic monitoring system operates in such deep waters and with this extent.
The expertise accumulated by Petrobras and UFRJ has the potential to become an international reference, opening doors for technology licensing and technical cooperation with other producing countries.
The largest underwater seismic monitoring system in the world is being built off the Brazilian coast, and the first results are expected as early as 2026. What do you think of this billion-dollar investment by Petrobras in the pre-salt? Does it make sense to bet on this technology for the country’s energy future, or could the resources be better directed? Leave your opinion in the comments.
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