US Strikes on Iranian Infrastructure Drive Brent to $88.10 Per Barrel as IMO Urges Ships to Avoid Hormuz

Brent crude futures settled at $88.10 per barrel on Thursday, July 17's ICE close, gaining $3.87 or 4.59 percent on the day as US military forces struck Iranian infrastructure. WTI crude settled at $82.44 per barrel on Thursday's CME close, up $3.49 or 4.42 percent. OilPrice.com reported that oil is on track for its biggest weekly gain since April as the Iran confrontation intensifies.

The WTI-Brent Spread Widens to $5.66, Signalling Geographic Risk Premium

The Brent-WTI spread on Thursday widened to $5.66 per barrel, against a historical norm of $2 to $4 per barrel. That extra $1.66 to $3.66 reflects the geographic concentration of Hormuz risk. Brent is the pricing benchmark for crude produced and shipped through the Persian Gulf, while WTI prices US domestic production delivered inland at Cushing, Oklahoma. When Hormuz shipping faces military disruption, Brent commands a premium that WTI does not.

Murban crude, produced in the UAE's onshore fields and sold on Abu Dhabi's Intercontinental Exchange, settled at $81.32 per barrel on Thursday, up $3.59 or 4.62 percent. Murban's settlement nearly matches WTI despite Murban's delivery point being physically inside the Gulf. That proximity to Hormuz would normally add a disruption premium to Murban; the absence of a wider premium suggests traders expect partial transit to continue.

US Military Actions and Iran's Response This Week

OilPrice.com reported US strikes on an Iran-linked tanker near Kharg Island earlier this week, followed by a broader strike on Iranian infrastructure on July 17, including bridges, railways, and an airport. Iran launched coordinated attacks targeting US military positions in five Gulf countries on July 12, per OilPrice.com. On July 17, Tehran retaliated against Thursday's US strikes. The International Maritime Organization urged shippers to avoid Hormuz transits as traffic through the strait approached a near-halt, per OilPrice.com reporting.

The escalation reverses a short-lived de-escalation signal earlier this week. President Trump reversed his proposed 20 percent cargo transit fee for Hormuz shipments on July 14, replacing it with trade and investment proposals, per OilPrice.com. That reversal briefly sent Brent lower despite escalating conflict, a pattern OilPrice.com documented under the headline "U.S. Strikes Iran Again as Brent Slips Despite Escalating Conflict." Thursday's 4.59 percent move shows the market re-priced the risk after the July 17 infrastructure strikes proved more extensive than prior actions.

Context From the Archive: Aker BP Q2 and the Kirkuk Deal

When Aker BP posted record Q2 2026 cash flow of $3.1 billion with production averaging 383,600 barrels of oil equivalent per day, the Brent tailwind was already in evidence. The Aker BP article cited Brent at $86.09 per barrel as of 5:50 a.m. Eastern Time on July 17, before Thursday's intraday surge to $88.10. Thursday's full-session close establishes that Q3 Norwegian offshore producers are entering the quarter at a higher Brent reference point than any Q2 settlement.

ConocoPhillips returned to Iraq this week with a 42 percent stake in BP's Kirkuk subsidiary as Brent crossed $88. Thursday's $88.10 settlement confirms Brent has now officially cleared that level on a full-session close, moving from an intraday cross to a daily official settlement. At that Brent level, the economics of the Kirkuk deal remain at their base case, while every dollar of further upside improves the return on ConocoPhillips's investment.

Forward Projections Diverge on Duration

Trading Economics models put Brent at $85.38 per barrel by end of the third quarter, implying a partial pullback from Thursday's $88.10 level. The 12-month forecast of $97.47 per barrel suggests the models see a prolonged elevated price environment rather than a swift resolution. IEA Executive Director Fatih Birol stated that "oil security is still a critical issue" and expressed concern that the world should be "worried" about the situation, per Al Jazeera reporting. Brent is up 10.33 percent over the past month and 27.17 percent year-over-year, per Trading Economics data.

The two forecasts describe different scenarios. A Q3-end pullback to $85 would require either diplomatic progress on Iran or a partial reopening of Hormuz transit routes. A 12-month path toward $97 implies the conflict stays active through the winter heating season, a scenario that would compound the European gas storage squeeze Oil Authority documented in a separate analysis this morning.