It can cause pollution
Because Australian crude is not suitable for some of the products that come from crude oil.
"Petroleum" products are distilled from crude oil, so what comes out of the ground is crude oil.
crude oil
Crude oil
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A crude oil refinery is a factory. The factory takes the crude oil, and turns it into useful products, like gasoline.
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at the refinery
Crude oil and seafood.
Eventually, crude oil will run out. Other sources will need to be discovered to replace crude oil and the many products produced.
Crude oil is processed to obtain petroleum products.
It varies alot. The minimum value is zero- as some crude oil are refined into other products. So, let's assume this is a crude that is economical to refine into gasoline. In this case , it can be as low as 2 gallons or as high as 23 gallons. (1 bbl = 42 gallons) Expressed as a percentage of the crude oil, this is 5 to 55%. (See attached links). The crude oil not refined as gasoline will be refined for other products. Common refined products from crude oil are provided in the related link, and will differ depending on the properties of the crude oil. It's very interesting that after refining, there will be more gallons of produced products than the original barrel of crude oil.