Oil prices surpassed $100 a barrel on Thursday, with experts closely monitoring the Red Sea for signs of clarity on the Houthi blockade's impact on crude oil shipments. Brent futures rose significantly, reaching $100.65 a barrel, a level not seen since late May, signaling market volatility.

The surge in oil prices follows the Iran-aligned Houthis' declaration of a naval blockade on shipments originating from Saudi Arabia. The group stated their intention to target tankers linked to Saudi Arabia, Israel, and the United States in the Bab el-Mandeb strait, a crucial maritime route connecting the Red Sea to the Indian Ocean.

On Thursday, the Houthis claimed responsibility for attacking two Saudi Arabian oil tankers. A Saudi news agency later confirmed that one of the vessels caught fire. The extent of damage to the second tanker remains unclear, according to marine analysis firm Windward.

Analysts suggest that the Houthi blockade is currently influencing which entities can transport Saudi crude rather than halting its movement entirely. The specific enforcement and scope of the blockade remain subjects of observation, with experts watching the passage of Chinese-owned tankers from the Saudi port of Yanbu as an indicator of market trends.

Michelle Bockmann, a senior maritime intelligence analyst at Windward, described the Houthi stance as "mercurial" and noted a lack of complete clarity regarding the blockade's implications. She highlighted that Chinese-owned tankers have historically received "free passage" in the region, even during previous periods of Houthi aggression against vessels linked to Israel and the United States in the wake of the war in Gaza.

Data from Windward indicates that cargo originating from Saudi Arabia, with Chinese crew and destination, passed through the Bab el-Mandeb chokepoint on July 20 without incident. These vessels utilized the same corridor that Western and Saudi-linked operators have been advised to avoid, suggesting the Houthis' enforcement is calibrated based on affiliation rather than the cargo itself.

"No one has ever been able to predict their actions… but they know you don’t have to do a lot to get the oil markets to react," Bockmann commented on the market's sensitive reaction to such developments. This implies that even a perceived threat or a limited blockade can trigger significant price fluctuations.

The situation underscores the delicate balance of geopolitical tensions in the region and their direct impact on global energy markets. The ongoing conflict and related maritime disruptions continue to be a key factor in the volatility of oil prices, with international observers keenly awaiting further actions or clarifications from the Houthi group.