"advance oil" is a way of oil trading, which refers to the oil futures trading before the physical oil is produced.

By signing a contract, the buyer and the seller agree to deliver a certain amount of oil at a certain price at a certain time in the future.

This trading method can help oil producers and consumers lock prices in advance and reduce the risk of price fluctuation.

At the same time, it also provides an investment channel for investors, who can make profits by forecasting the trend of oil prices.