Yoon's office compressed four Blue Whale wells from 2029 to 2026 over ministry objections

Korea National Oil Corporation wrote the basic plan for Blue Whale drilling in October 2023, before the assessment work beneath it was finished, and the overseas advisory panel it used checked whether the contractor's method was appropriate ^[14]. The audit board concluded that the drilling went ahead without sufficient verification of the resource volumes or the geological probability of success ^[15]. The volume in question was 7.42 billion barrels on a P50 basis across seven promising structures ^[11]. East Sea gas fields produced 45 million barrels in the previous 17 years ^[12], about 2.6 million a year ^[1], so the estimate carried roughly 2,800 years of that output ^[2]. For some structures the contractor's figure ran 39.2 times past earlier assessments by other firms ^[13].

The 6.3% saturation is about an eighth of the bottom of the range the project expected ^[3], and what came up was biodegraded biogas, not the thermogenic hydrocarbons that would indicate a strong likelihood of oil and natural gas ^[17].

In September 2024, after a briefing on the specific drilling schedule, the presidential office demanded the work fit inside Yoon's term ^[5]. The ministry said shortening it would be difficult because evaluation and analysis of each well takes time, and the office arranged for then-Trade Minister Ahn Duk-geun to report to Yoon directly ^[6]. Ahn brought a plan finishing drilling in the first quarter of 2028 ^[7], eight to ten months after the term ended in May 2027 ^[4], and said "a political judgment is needed" ^[8]. Yoon rebuked him. "I am the one who makes political judgments," he said, and ordered the schedule redrawn ^[9]. Ahn came back with four wells by 2026, a timeline he himself considered unrealistic ^[10].

The board put one figure in won. The mandatory drilling deadline at the time was April 2026, so there was no need to bring the first well forward to the end of 2024, and moving that work to June or July 2025 would have saved 4.3 billion won in charter fees ^[23]. Spread over the six or seven months of early chartering, that is roughly 610 million to 720 million won a month ^[6]. KNOC placed the rig charter order before its investment risk committee and its board of directors had deliberated on it ^[22].

The contracting file is where the enforceable findings sit. Seventeen firms had done prospectivity work before, more than the limited competitive bidding route permits, and KNOC picked four of them for the first contract and three for the second, 24% and then 18% of the eligible field, without running a market survey ^[19][5]. It also withheld the bid evaluation criteria from the firms, and in the second contract applied evaluation items that had not been set in advance to eliminate a competing bidder ^[20].

For anyone lending to a state oil company or bidding into one, the useful part of this audit is where its sanctions stop, which is inside the contracting office. The counter-thesis is that the presidential office moved dates and nothing else: the ministry's own May 2024 plan already committed to four additional wells through 2029 ^[4], and 6.3% saturation would have read the same in 2029 as it did in 2025 ^[16]. Pulling that programme into 2026 took about three years out of it ^[7]. What would undercut this reading is one of the additional wells in the seven structures returning thermogenic gas near the 50% to 70% first expected ^[11][16]. That would make the volume estimate defensible and the timing fight procedural.