On May 8, 2025, American oil giant Murphy Oil and South Korea’s SK Earthon announced a significant oil discovery off the coast of Vietnam.

According to Oil & Gas Journal, Murphy Oil struck oil at the Pink Camel well in Block 15-1/05 of the Cuu Long Basin, approximately 34 miles (55 km) off the coast of Vietnam.

The exploration well encountered a 105-foot (32-meter) column of oil pay at a depth of 13,451 feet (4,100 meters). Murphy Oil assessed the oil as high-quality crude, with a successful production test of up to 2,500 barrels per day and an estimated reserve potential of 30-60 million barrels.

Illustration: Murphy Oil

SK Earthon also struck black gold at the Pink Camel well, located offshore on Vietnam’s continental shelf.

This discovery marks the second successful oil find for SK Earthon in Vietnam this year. The company previously discovered oil in Block 15-2/17 of the Cuu Long Basin in January 2025.

Following this discovery, Vietnam, in collaboration with SK Earthon and Murphy Oil, plans to commence crude oil production in 2025. The joint venture comprises Murphy Oil (40%), Vietnam’s Petroleum Exploration and Production Corporation (PVEP) (35%), and SK Earthon (25%).

What is High-Quality Crude Oil?

Experts characterize Vietnamese crude oil as generally light and sweet: with an API gravity ranging from 35 to 40 degrees and low sulfur content. These characteristics make it ideal for producing high-quality gasoline and diesel fuel. Such traits are indicative of premium crude oil.

Illustration: Oil. Source: Adobe Stock

According to the U.S. Energy Information Administration (EIA), high-quality crude oil is characterized by low density (light oil) and low sulfur content (sweet oil).

Consequently, light and sweet crude is easier to refine, making the refining process more efficient and less costly. These two qualities set the standard for premium oils, commanding a higher price per barrel on the international market.

– Light oil is associated with API gravity. The standard measure of oil density is based on the gravity of the American Petroleum Institute (API). The numbers range from 10 to 70, with higher API gravity indicating lighter oil.

– What about the term “sweet”? It doesn’t refer to taste but to the sulfur content in crude oil, with the threshold set at 0.5%. Sulfur content above 0.5% is considered sour, while below 0.5% is deemed sweet. The sweeter the oil, the easier it is to refine into gasoline and other petroleum products.

Source: Charles Schwab Corporation – an American multinational financial services company.

 

EIA further explains that various types of crude oil are produced globally. The market value of a particular crude oil stream reflects its quality characteristics. Two of the most critical quality characteristics are density and sulfur content. Density ranges from light to heavy, while sulfur content is characterized as sweet or sour. Light and sweet crude oils typically command a higher price than heavy, sour crude.

Refining High-Quality Crude Oil Reduces Costs and Environmental Impact

Economically, light and sweet crude oil (Light sweet crude oil) significantly reduces production costs. The refining process for this oil is simpler and does not require complex technologies such as cracking or desulfurization.

This not only reduces operating costs but also enhances economic efficiency for refineries. Moreover, low sulfur content minimizes equipment corrosion, prolongs machinery lifespan, and lowers maintenance expenses.

Environmentally, light and sweet crude oil substantially conserves energy during the refining process. Due to its high light hydrocarbon content, refining this oil requires less energy, thereby reducing CO2 emissions—a significant contributor to the greenhouse effect. Additionally, the low sulfur content in sweet oil curtails SOx emissions, improving air quality and mitigating the risk of acid rain, a severe environmental concern.

Products derived from light, sweet crude, such as gasoline and diesel, also meet stringent emission standards like Euro 5 and Euro 6. This means that vehicles fueled by these products will emit fewer toxic gases, positively impacting urban environments and community health.

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