Oil prices rose for a second session on Sept. 13 as concerns over shut output in the U.S., the world’s biggest producer, following damage from Hurricane Ida supported the market, along with expectations for higher demand.

Brent crude rose 67 cents, or 0.9% to $73.59/bbl, and  WTI crude in the U.S. also added 66 cents, or 1%, to $70.38 at 0633 GMT. Both markets were at their highest since Sept. 3 earlier in the session.

About three-quarters of the offshore oil production in the U.S. Gulf of Mexico, or about 1.4 million bbl/d, has remained halted since late August, roughly equal to what OPEC member Nigeria produces.

U.S. refiners are coming back faster than oil production from the impact of Hurricane Ida, a reverse of past storm recoveries. Most of the nine Louisiana refineries impacted by the storm have restarted or were restarting on Sept. 10.

“Hurricane Ida was unique in having a net bullish impact on U.S. and global oil balances—with the impact on demand smaller than on production,” Goldman Sachs analysts said in a note dated Sept. 9.

The bank estimated that the storm caused U.S. oil inventories to decline by about 30 million barrels and could push up U.S. refining margins and further widen the price spread between WTI and Brent.

Royal Dutch Shell Plc, the largest oil producer in the U.S. Gulf, on Sept. 9 canceled some export cargoes because of damage to offshore facilities from Hurricane Ida, signaling energy losses would continue for weeks.

However, the number of rigs in operation in the United States grew in the latest week, energy service provider Baker Hughes said, indicating production may rise in coming weeks.

Beyond the impact of Ida, market attention will focus this week on potential revisions to the oil demand outlook from OPEC and the International Energy Agency (IEA) as coronavirus cases continued to rise. OPEC will likely revise its 2022 forecast lower on Sept. 13, two people familiar with the matter said.

“It looks like oil prices may continue to drift in a consolidation range for now, $70-$75 as we mentioned previously,” said Howie Lee, an economist at Singapore’s OCBC bank.

“Markets still need clarity on the virus impacts beyond the very near term and until we get that, it seems like most assets, including oil, may continue to drift sideways.”

Money managers raised their net long U.S. crude futures and options positions in the week to Sept. 7, the U.S. Commodity Futures Trading Commission (CFTC) said on Sept. 10.

Supply risks remain from China’s planned release of oil from strategic reserves while the hope of fresh talks on a wider nuclear deal between Iran and the West was raised after the U.N. atomic watchdog reached an agreement with Iran on Sunday about the overdue servicing of monitoring equipment to keep it running.

China said on Sept. 13 it will announce details of planned crude oil sales from strategic reserves in due course.