26/03/2026
But a content Engineers
When we talk about light, medium, heavy and extra heavy oil, we are not just talking about a technical classification.
We are talking about completely different geological realities, which directly impact cost, technology, risk and energy strategy.
Light Oil
Light oil has low viscosity and a higher content of noble fractions, such as gasoline and diesel. It is the most desired by refineries.
This type is found:
Saudi Arabia
United States (especially shale oil)
Nigeria
Norway
Although it flows more easily, the challenge is often to:
At the depth of the reservoirs
In deepwater offshore production
In hydraulic fracturing, in the case of shale.
In technical terms, it is the simplest to produce. The biggest challenge is usually geographic and environmental.
Medium Petroleum - It is an intermediate category, with moderate viscosity and sulfur content.
Where it is found:
Angola (Africa)
Brazil (especially in the pre-salt)
Kuwait
Iraq
Extraction challenges - In the case of Angola and Brazil, for example, the big challenge is not the type of oil, but:
- Water depths greater than 2,000 meters,
- Wells that exceed 5,000 to 7,000 meters in depth
- High pressures and presence of CO₂
Here, the API grade is not the main problem, the problem is the depth at which it is and the cost of the project at that depth.
Heavy Petroleum - More viscous and with a higher contaminant content, it requires more processing.
Where it is found:
- Canada
- Mexico
- China
Extraction challenges -The problem starts in the runoff:
Low fluidity
Need for heating or dilution
Use of thermal recovery
In addition, refining requires more complex units, such as coking and hydrocracking.
Extra Heavy Oil - Extremely viscous, often similar to bitumen. In some cases, it practically does not flow naturally.
Where it is found
Venezuela (Orinoco Belt)
Canada (Alberta Oil Sands)
Extraction challenges, here it gets really complex:
Continuous steam injection
Methods like SAGD
Oil sands mining
High energy consumption
Increased carbon footprint
In many cases, the environmental and energy cost is the main point of debate.
There is no "one" oil. There is a huge diversity of oils, each with its own geology, its associated technology and its economic challenge.
While light oil facilitates refining, heavy and extra heavy oil require advanced engineering and robust investments. On the other hand, countries with large reserves of these denser oils end up developing sophisticated technological solutions to make production viable.
At the end of the day, the type of oil defines a large part of a country's energy strategy and also directly influences contracts, investments and long-term decisions in the sector.
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