on august 6, the international oil price fell. the settlement price of the main contract in the u.s. wti crude oil futures market was $68.28/ barrel, n $0.81 or 1.20%, and the settlement price of the main contract in the brent crude oil futures market was $70.70/ barrel, n $0.59 or 0.83%. oil prices fell mainly due to market concerns about the negative impact of delta mutation virus on economic recovery.