Dated Brent and the BFOET Mechanism
Dated Brent, the reference price behind two-thirds of the world's traded oil, is built from a shrinking pool of physical North Sea cargoes, so the benchmark's mechanics keep widening to include more fields just to stay liquid.
Prerequisites: Crude Oil Benchmarks: WTI, Brent and Dubai, Price Reporting Agencies and Assessed Prices
Most of the world's crude oil, refined product, and even a chunk of its natural gas is priced off a number called Dated Brent — yet Dated Brent isn't a single field, a single grade, or even a single company's oil. It's a price assessment built each day from a handful of North Sea crude streams, stitched together because any one of them alone stopped producing enough barrels decades ago to be a trustworthy benchmark on its own.
Dated Brent is not a futures price — it's a daily assessment of physical cargoes, published by a price reporting agency, built from a rotating basket of grades (currently Brent, Forties, Oseberg, Ekofisk, Troll — the "BFOET" basket) because North Sea production alone is too small to price on any single stream.
Why a basket instead of one grade
Original Brent crude production has fallen for decades as the North Sea field matured, and by the 1990s it alone produced too few cargoes to support a liquid, manipulation-resistant benchmark. Instead of retiring it, the price reporting agency (Platts, now S&P Global Commodity Insights) kept widening the basket of grades deliverable against it — Forties, then Oseberg, Ekofisk, and Troll, giving the acronym BFOET. Each grade differs slightly in quality (sulfur content, density), so each carries its own quality premium or discount to compare on equal footing.
The mechanism: every day, participants report bids, offers, and trades for cargoes of any BFOET grade loading in a window roughly 10–25 days forward. The agency assesses which cargo, adjusted for quality, is cheapest deliverable, and converts that into what a barrel of the reference grade would have cost that day. That converted number is Dated Brent.
Worked example
Suppose on a given assessment day, quality-adjusted offers for loading cargoes are: Forties at $79.80/barrel, Ekofisk at $79.95/barrel, and Troll at $80.10/barrel, each after applying its own published quality premium or discount versus the Brent reference grade. The reporting agency identifies Forties as the cheapest-to-deliver (CTD) cargo that day. Dated Brent is assessed at $79.80/barrel — not an average of the five grades, but the value of the marginal, cheapest one, because that's the price a buyer would actually pay if forced to source a barrel that day.
What this means in practice
Because Dated Brent prices physical cargoes rather than a futures contract, it feeds contracts that never touch a Brent futures exchange — most Middle Eastern and African crude grades and long-term supply contracts reference it via a formula, often "Dated Brent plus or minus a fixed differential." Anyone trading crude derivatives needs to know whether their exposure is to ICE Brent futures or to Dated Brent — the two track closely but are not identical, and the gap between them is itself a traded instrument.
Adding more grades to the BFOET basket keeps the benchmark liquid, but it also means Dated Brent's underlying quality has drifted over time — today's basket is on average sourer and heavier than original Brent crude was in the 1980s. A quality premium that was fair a decade ago isn't automatically fair today; the reporting agency periodically resets the differentials for exactly this reason.
Further reading
- Platts, 'Dated Brent Price Assessment Methodology'