Crude oil reserves are running down.

【run】原油储备在逐渐缩减。

And together they control more than 80% of the world’s proven crude oil reserves.

它们共同控制着世界已探明原油储量的 80% 以上。

The Department of Energy estimates them at something on the order of 400 billion barrels of oil equivalent in natural gas and oil. That's four times the crude oil reserves of Kuwait.

能源部估计它们相当于 4000 亿桶石油当量的天然气和石油。这是科威特原油储量的四倍。