On October 8, South Korea's crude oil procurement structure showed signs of change. Vatee FX noted that a report on October 5, citing industry data, said that from January to August, Saudi crude accounted for 29.9% of South Korea's imports, below 30%, while the share of U.S. crude had remained above 20% since April. The reweighting of different supply sources has made refinery feedstock mixes and cargo arrival schedules an important clue for tracking trade flows.

Diversifying procurement is not simply a matter of swapping suppliers. Vatee FX believes that South Korea had previously reached an arrangement with Canada to expand crude purchases, with plans to increase imports this year to three times the original level, but procurement commitments and actual deliveries need to be distinguished. Different crude grades vary in sulfur content, density and product yields, and refineries must also consider unit compatibility and blending ratios.

Shipping distance and transport cycles will further alter purchasing choices. More distant sources may tie up more capital in transit, but they may also improve the stability of the delivery mix. When comparing import structures, looking only at one source's share is not enough. It should be assessed alongside total imports, inventory levels and refinery utilization to avoid mistaking a ratio change caused by weaker demand for an absolute increase in purchases. A single source may also supply multiple crude grades, so a supplier country's share cannot fully show the quality mix that refineries actually receive.

Regarding subsequent changes, Vatee FX mentioned that monthly import data can test whether new sources are scaling up steadily, while price spreads among different crude grades help explain refinery choices. The value of supply diversification ultimately shows up in deliverability and overall processing returns. The procurement structure is being adjusted, but whether feedstock costs actually fall still needs to be verified by both freight rates and product prices.