Petrobras robots dove nearly 3,000 meters deep and 201 km off the coast of Rio de Janeiro confirmed what geologists suspected — there is more oil hidden in the pre-salt of Campos.

Written by Douglas Avila

Published on 19/04/2026 at 06:47

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201 km off the coast of Rio de Janeiro and nearly 3,000 meters underwater, Petrobras robots confirmed through electrical profiles and fluid samples that the pre-salt of the Campos Basin still holds oil where no one had drilled

In an ocean region where the water depth reaches 2,984 meters, Petrobras robots dove to the bottom and confirmed what geologists had suspected for years.

There is more hidden oil in the pre-salt of the Campos Basin.

The announcement was made by Agência Brasil on April 13, 2026.

ARTICLE CONTINUES BELOW

Block C-M-477 — where it is and who operates it

The exploratory well was identified in the SC-AP4 sector, within the C-M-477 block.

The location is 201 kilometers from the coast of the state of Rio de Janeiro.

Petrobras operates the area with a 70% stake.

The other 30% belongs to bp, the British energy giant.

Thus, the risk and investment are shared between the two companies.

Context: Petrobras already produces 2.2 million barrels per day in the pre-salt

The discovery gains importance in the context of Petrobras’s record production.

The company surpassed the mark of 2 million barrels of pre-salt produced per day for the first time.

The record reached 2.2 million barrels daily.

Therefore, any newly confirmed reservoir could further increase this production.

Drilling operation on a modern offshore platform — Drilling in the C-M-477 block revealed indications of gas and fluid samples that will now be analyzed in the laboratory to determine commercial viability

What comes next: laboratory decides the future

The samples collected during drilling will undergo laboratory analyses.

The goal is to determine the characteristics of the reservoirs and the fluids found.

This stage will define the commercial viability and the next steps of exploration.

If the results are positive, Petrobras may begin the development of the well, which would involve new platforms and underwater infrastructure.

Campos Basin — the veteran that still surprises

The Campos Basin is the oldest oil-producing area in deep waters in Brazil.

Many analysts believed it had already delivered its maximum potential.

However, the new discovery in the pre-salt shows that there are still unexplored reservoirs at extreme depths.

Oil platforms in the Campos Basin off the coast of Rio de Janeiro — The Campos Basin is located 201 km from the coast of Rio de Janeiro and continues to deliver discoveries even after decades of exploration

Caveats

The presence of hydrocarbons was confirmed through electrical profiles and fluid samples, but commercial viability has not yet been determined.

Moreover, developing a new well at nearly 3,000 meters deep involves billion-dollar investments and timelines that can take years.

Still, the discovery reinforces Brazil’s position as one of the largest exploratory frontiers for oil in the world.

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Petrobras robots dove nearly 3,000 meters deep and 201 km off the coast of Rio de Janeiro confirmed what geologists suspected — there is more oil hidden in the pre-salt of Campos.

201 km off the coast of Rio de Janeiro and nearly 3,000 meters underwater, Petrobras robots confirmed through electrical profiles and fluid samples that the pre-salt of the Campos Basin still holds oil where no one had drilled

Block C-M-477 — where it is and who operates it

Context: Petrobras already produces 2.2 million barrels per day in the pre-salt

What comes next: laboratory decides the future

Campos Basin — the veteran that still surprises

Caveats

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Petrobras robots dove nearly 3,000 meters deep and 201 km off the coast of Rio de Janeiro confirmed what geologists suspected — there is more oil hidden in the pre-salt of Campos.

201 km off the coast of Rio de Janeiro and nearly 3,000 meters underwater, Petrobras robots confirmed through electrical profiles and fluid samples that the pre-salt of the Campos Basin still holds oil where no one had drilled

Block C-M-477 — where it is and who operates it

Context: Petrobras already produces 2.2 million barrels per day in the pre-salt

What comes next: laboratory decides the future

Campos Basin — the veteran that still surprises

Caveats

While in Brazil a 10-story building takes 2 years to complete, in China a company stacks pre-fabricated modules and raises the entire building in just 28 hours and 45 minutes.

The oldest tree in the world, alive since before the birth of Jesus Christ, is cut down in a scientific study and the case changes environmental preservation rules.

An entire island in the Pacific wants to surround itself with a colossal barrier against the ocean to try to escape increasingly violent waves and not be swallowed by the sea in the coming decades.

After ten days orbiting the Moon, science confirms that the astronauts of the Artemis II mission return with altered bodies.

Peru built a tunnel at an altitude of 4,738 meters cutting through the Andes Mountains, and the road leading to it reaches 4,818 meters, making it the highest paved road in the entire world.

Seen from space, an image taken by an astronaut shows in Argentine Patagonia the exact point where a colossal glacier, a turquoise-blue lake, and a greenish arm of water meet, creating one of the rarest and most impressive landscapes in the region.

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