Brent Crude Settles at $104.28 as Hurricane Isaias Shuts In 1.28 Million bpd of Gulf Oil and Hormuz Attacks Hit Daily Pace

Brent crude settled at $104.28 per barrel on Thursday's ICE close, up 4% on the day, as two simultaneous supply shocks struck global oil markets. U.S. West Texas Intermediate settled at $91.49 per barrel on the CME, a 3.6% gain, according to CNBC's October 8 closing report. Both benchmarks moved sharply higher before the close, driven by Hurricane Isaias in the Gulf of Mexico and an escalating tanker attack campaign in the Strait of Hormuz.

Hurricane Isaias Shuts In 63% of Gulf of Mexico Oil Production

The Marine Minerals Administration reported Thursday that operators had shut in approximately 62.89% of current Gulf of Mexico oil production. That translates to more than 1.28 million barrels per day offline as of the agency's October 8 survey. Natural gas shut-ins reached 57.35% of Gulf gas production as of the same report. Operators evacuated personnel from 121 of the region's 371 manned platforms, representing 32.61% of total manned Gulf platforms.

BP shut in all production at Thunder Horse and Na Kika and evacuated all personnel from both facilities. Thunder Horse processes up to 250,000 barrels of oil per day and sits in Mississippi Canyon approximately 150 miles southeast of New Orleans. ExxonMobil holds a 25% working interest in Thunder Horse, alongside BP's 75% stake. Na Kika is a semi-submersible facility in 6,340 feet of water; Talos Energy and Ridgewood Energy now hold the 50% stake that Shell divested for $1.7 billion in June 2026. Shell and Chevron also curtailed offshore operations, per Reuters, though neither named specific platforms.

Hurricane Isaias, the first hurricane of the 2026 Atlantic season, is forecast to make landfall between Mobile, Alabama, and Destin, Florida, late Friday at Category 1-2 strength with sustained winds near 85 miles per hour. Earth Science Associates modeled approximately 9 million barrels of total Gulf production loss through the storm's duration. That figure aligns with a direct calculation: 1.28 million bpd offline for seven days yields 8.96 million barrels of lost U.S. crude supply. By comparison, Tropical Storm Bertha cost the Gulf 7.1 million barrels in July. Energy Aspects estimated 0.5 million bpd of refining capacity is in the storm's path, including the Pascagoula refinery.

Iran Attacks Hormuz Tankers at Least Once Per Day Since October 2

A coalition of U.S.-allied militaries reports that nearly 20 commercial ships, predominantly tankers, have come under attack in and around the Strait of Hormuz over the past month. UKMTO recorded at least one attack per day since October 2. Windward, a maritime intelligence firm, estimated roughly two vessels per 100 transiting Hormuz were attacked in Q3 2026. Oil flows through the strait now depend on U.S. Navy escorts along a southern route near the Omani coast, according to maritime security officials at London's Energy Intelligence Forum this week.

Kpler estimated Gulf export flows at approximately 10.3 million barrels per day this week, about 23% below the prewar baseline of 13.5 million bpd. Commodity traders at the Forum described flows running at roughly 80% of prewar levels. The two estimates bracket a sustained Hormuz throughput range of 10 to 11 million bpd. Officials at the Forum said no negotiated settlement appears imminent.

Goldman's $85 Base Case Sits $19 Below Where Brent Settled on Thursday

Goldman Sachs revised its December 2026 Brent forecast to approximately $85 per barrel in a late September note, up $5 from its prior estimate. The bank identified a bull-case scenario of Brent exceeding $120 per barrel in Q4 if Hormuz disruptions persist and Gulf exports remain near 4 million bpd below prewar levels. Goldman has described that $120 scenario as a tail risk, not its base expectation. The U.S. Energy Information Administration set its Q4 2026 Brent forecast at approximately $105 per barrel in its most recent Short-Term Energy Outlook. Thursday's $104.28 settlement sits $0.72 below that EIA figure.

RBC Capital Markets analyst Helima Croft told Reuters that Brent could top $120 per barrel by year-end if Middle East conflict continues. PVM analysts writing in September described the market as having lost its defenses against $120 Brent. The Goldman-EIA gap, from $85 to $105, already brackets Thursday's ICE close. A move to $120 from Thursday's settlement would represent a further 15% gain for Brent in under three months.

G7's 100-Million-Barrel Reserve Release Has Been Fully Priced Out

When G7 nations coordinated a 100-million-barrel strategic reserve release in late September, Brent briefly fell below $100 per barrel, as Oil Authority reported at the time. Thursday's $104.28 settlement has fully erased that reserve-release discount. One hundred million barrels represents roughly one day of global oil supply; it was not enough to offset a protracted Hormuz export disruption. The question traders now face is whether Hurricane Isaias causes lasting platform or refinery damage, or whether production returns within the typical seven-to-fourteen-day post-storm recovery window seen in prior Gulf storms.

Canadian producers with U.S. Gulf of Mexico exposure receive revenues in U.S. dollars against Canadian dollar costs. With WTI settling at $91.49 per barrel on Thursday, up from $91.11 at the most recent Baker Hughes rig count date, the directional move is positive but marginal for hedged CAD revenues. For integrated producers such as Suncor Energy, the WCS differential and Trans Mountain throughput levels remain the larger price drivers, not U.S. Gulf weather events.