Explore ultra-deep waters
on a 7,000-meter dive and
discover all about the pre-salt
We believe the Santos Basin is one of the most promising offshore exploration areas in the world, particularly in its southern portion, and the most prolific in the pre-salt region. Our pre-salt activities in the Santos Basin began with the acquisition of blocks in the early 2000s.
Three fields stand out from the others: Búzios, Mero and Tupi. Learn more below.
Búzios Field
It is the largest oil producing field in the country. A giant in quantity and also in size: its reservoir is up to 480 meters thick — almost 100 meters higher than the height of Sugarloaf Mountain! And its enormous extension, of 852 km², corresponds to 115 thousand soccer fields.
Brazil's largest oil platform is also located in Búzios: the FPSO Almirante Tamandaré. At 182 meters, it is the height of five Christ the Redeemer statues. In October 2025, Almirante Tamandaré reached 270 thousand barrels produced per day.
Start of operations
It was already responsible for more than 20% of Petrobras' total oil production
Reached a total accumulated production of 1 billion barrels of oil equivalent.
Reached the production record of 1 million barrels per day, and the expectation is to surpass the 2 million mark by 2030.
Tupi Field
- This is where we extracted the first pre-salt oil in the Santos Basin.
- It is the largest oil-producing field in deep waters in the world, with over 2 billion barrels of oil equivalent extracted.
- Its production capacity exceeds 1 million barrels of oil equivalent per day.
Mero Field
- This is where the first Subsea High Pressure Separation System (HISEP®) was implemented — an unprecedented technology patented by Petrobras that, after self-consumption on the FPSO, reinjects all gas production with 45% CO₂ content back into the reservoir.
- It is located in the northwestern portion of the Libra block, where we operate in consortia with other companies in the sector.
- In 2022, we installed the first permanent system in the field, the FPSO Guanabara, with the capacity to process 180 thousand barrels of oil per day.
- The estimated recovery for the Mero Field exceeds 3 billion barrels of oil by 2048, with a peak annual production of 600 thousand barrels per day.
Campos Basin is one of the most important sedimentary basins in Brazil, located off the coast of Rio de Janeiro state. Its oil and natural gas exploration began in the 1970s and, since then, it has played a crucial role in national production.
Currently, Campos Basin still holds significant reserves and continues to be a strategic area for Petrobras, especially with the application of new technologies for the revitalization of mature fields and the development of new discoveries.
Our operations in this basin are focused on optimizing production, increasing oil and gas recovery, and investing in decarbonization projects, seeking the efficiency and sustainability of our operations.
Learn about 5 innovations that allow us to explore the full potential of the largest pre-salt field in the world
We will maintain our leadership in oil and gas while innovating to lead the global pursuit of a safe and just energy transition. To achieve this, we are constantly engaged in research and development of new technologies to explore and produce with the lowest possible impact.
In 2021 and 2025, our innovations in the Búzios Field earned us two Distinguished Achievement Awards from OTC, considered one of the most important recognitions in the global energy sector. Discover some of the innovations used in our pre-salt fields.
The first place where pre-salt oil was discovered was in the minds of great professionals
Meet some professions that transformed the pre-salt into reality and how they worked through the process.
Find out more about pre-salt formation and its characteristics
A question we hear a lot is: pre-salt, what is it?
The pre-salt consists of sedimentary rocks that were formed more than 100 million years ago with the separation of the current South American and African continents. With this separation, large depressions emerged that gave rise to several lakes, which were later connected to the oceans.
In deeper regions of these lakes, large amounts of organic matter from microscopic algae began to accumulate. This organic matter, mixed with sediments, formed the rocks that generate the oil and gas of the pre-salt.
Shells and limestone rocks and pre-salt reservoirs
In the shallowest parts of these lakes, on large lake islands, the so-called calcareous shells appeared, which increasingly accumulated over time. Later on, these shells 'gained the company' of stromatolite deposits, which are nothing more than types of algae that form limestone rocks. Both limestone shells and limestone rocks gave rise to the main reservoirs of the pre-salt layer.
The pre-salt layer
Due to the arid climate at that time, the intense evaporation of sea water caused the accumulation of salts, which created the pre-salt layer, a kind of protection that prevented the oil from 'escaping' and reaching the surface.
Pre-salt depth
The total depth of the pre-salt layer exceeds 7,000 meters, which is equivalent to the height of the highest point in the Andes Mountains! The pre-salt oil quality is very high — as well as the water pressure in the place. What many called impossible, we used as fuel: we dived headlong into research and innovation to develop unique technologies that allowed us to go where no one else had gone.
Check out the best moments
in the history of pre-salt until now
2006
Discover some technologies that make a difference in our daily lives
Knowledge and practical experience are decisive factors in all areas of life. It is no different with us! By researching and working on this we were able to improve and create new technologies and develop innovative solutions to operate in a sustainable way and reduce emissions in ultra-deep waters. All this evolution came with the premise of maximum security and the least possible impact. Check out some of them.
What technologies are we investing in?
Every day, we are faced with new challenges that need to be overcome. Therefore, we join startups, universities and other institutions, through an open innovation program, to create projects and technologies that boost the value and competitiveness of our pre-salt business — with a focus on decarbonizing our operations. Meet some of them.
Do you have the solution we
need? Let's work together!
Petrobras is an open innovation company, and its doors are open to partnerships that help us build a more sustainable world, reconciling the focus on oil and gas with diversification in low-carbon businesses.
Discover the Connections for Innovation (Conexões para Inovação)Furthermore, production in the pre-salt layer also helps in the social and economic development of the country, with new jobs and income.
The oil is then transferred to a relief vessel, which transports the oil to an onshore terminal. Natural gas is sent to the ground through pipelines and/or is reinjected into the reservoir.
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