The Blue Whale project, a deepwater oil and gas exploration venture in the Ulleung Basin of the East Sea (also known as the Sea of Japan), has emerged as South Korea’s boldest yet also most uncertain bet on energy independence. Being the nation’s potentially first large-scale offshore hydrocarbon prospect, the field is believed to hold between 3.5 and 14 billion barrels of oil and gas – a wave of supply that could, if confirmed, satisfy up to 30 years of natural gas demand and 4 years of oil consumption. For a country that imports nearly all of its energy, the stakes could hardly be higher.
The Blue Whale project began under the administration of President Yoon Suk Yeol, who approved it in June 2024 following seismic studies that suggested promising geological formations beneath the East Sea. Operated by the Korea National Oil Corporation (KNOC), the concession covers four offshore blocks totaling 20,058 square kilometers, located roughly 270 kilometers southeast of Seoul. The water depth reaches about 1,300 meters, with a total planned drilling depth of 3,000 meters, making it one of the deepest operations ever attempted in Korean waters. The government initially agreed to finance half the cost of the first well (around $35million) – while KNOC held full operating rights for a 30-year term.
By the end of 2024, however, the optimism had begun to unravel. The first well showed signs of natural gas, but tests showed low hydrocarbon saturation, meaning the reservoir could not yield gas at commercial levels. In geological terms, the reservoir and cap rock were well-formed, but hydrocarbons had migrated away, leaving only traces. The findings were not disastrous – the rock quality suggested potential in nearby structures – but they were disappointing enough to cool political appetite. The Ministry of Trade, Industry and Energy concluded that the site’s economic feasibility could not be verified, dampening early enthusiasm.
Then came domestic turmoil. As political tensions escalated to the point when martial-law was imposed, the government quietly scaled back its funding for Blue Whale – from tens of millions of dollars to barely $600,000. In September 2025, the project was finally removed from the national budget altogether. As public funding evaporated, KNOC faced an uncomfortable reality: it could not continue alone.
That decision opened the door for international oil majors. KNOC launched a competitive bidding round to bring in a foreign partner to share costs and risk across the Ulleung Basin acreage. In October 2025, BP plc emerged as the preferred bidder, pending final government approval. The potential offer grants BP a 49 % interest across the four blocks, equivalent to roughly 9,800 square kilometers of net acreage.
For BP, the project represents a natural extension of its Asia-Pacific deepwater portfolio. The company already operates large upstream positions in Malaysia, Indonesia, and Australia, and has the engineering experience to manage the technical challenges of Korea’s first deepwater well. For Seoul, BP’s involvement offers a vital injection of capital, technology, and credibility. It also signals that, despite earlier setbacks, the East Sea basin retains genuine commercial promise.
South Korea’s domestic consumption of natural gas stands at about 5.5 billion m3/month so far in 2025, according to JODI data. Gas-fired power generation has remained stable, averaging around 40% of the national electricity mix over the past five years, sustaining strong baseline demand across industrial and residential sectors. Historically, gas use grew rapidly, but in recent years it has plateaued, with a brief slowdown observed in 2023. Under the government’s 10th Basic Plan on Electricity Supply and Demand, Seoul aims to reduce the share of fossil fuels while expanding renewables and nuclear capacity by 2038. Natural gas is expected to serve as a transitional fuel in this shift, yet its long-term dominance is increasingly uncertain. South Korea’s broader commitment to achieve net-zero emissions by 2050 will inevitably lead to a gradual decline in natural gas consumption over the coming decades.
This broader energy backdrop explains why the Blue Whale project carries such weight for policymakers and investors alike. South Korea’s gas needs are met almost entirely by imports—primarily from Qatar, Australia, the United States, and Malaysia, which together account for roughly two-thirds of total LNG supply. Smaller volumes continue to arrive from Oman, Indonesia, and Russia’s Sakhalin-2 project, the latter still shipping limited cargoes under pre-war contracts. The country’s only domestic producer, the Donghae gas field, discovered in 1998, was decommissioned in 2023 after nearly two decades of modest output—just 0.4 million cubic meters per day, a negligible fraction of national demand. KNOC is now studying the retired platform as part of a carbon-capture and storage pilot, a fitting symbol of both Korea’s technological capability and its deep reliance on imported fuel.
If BP and KNOC can prove commercial viability in the Ulleung Basin, the discovery could reshape Korea’s strategic energy map. Even a moderate field producing a few million m3/day would give the country its first real domestic supply base, reduce exposure to volatile global markets, and strengthen energy security in Northeast Asia – a region where Japan and China are already exploring aggressively in neighbouring waters of the East China Sea.
Yet the path forward remains uncertain. Deepwater exploration is expensive, and the first well’s results have tempered expectations. The government’s political will is fragile, and public scrutiny over fossil-fuel investments is mounting in a world moving toward decarbonization. But for South Korea, the Blue Whale project is about more than hydrocarbons. It is a test of whether one of the world’s most import-dependent economies can turn ambition, technology, and international partnership into a tangible measure of self-reliance beneath the waves of the East Sea.
By Natalia Katona for Oilprice.com
More Top Reads From Oilprice.com
Oilprice Intelligence brings you the signals before they become front-page news. This is the same expert analysis read by veteran traders and political advisors. Get it free, twice a week, and you’ll always know why the market is moving before everyone else.
You get the geopolitical intelligence, the hidden inventory data, and the market whispers that move billions – and we’ll send you $389 in premium energy intelligence, on us, just for subscribing. Join 400,000+ readers today. Get access immediately by clicking here.
