The major part of crude oil is a heavy tar like paste, call it bunker fuel (60 to 70 %) and the more fluid part Naptha is capable of more refinement (30 to 40%) Bunker fuel can be used to burn as a fuel in larger furnaces but it requires preheating to make if fluid. Naptha is the base for gasoline, solvents and for drug production.
It requires separation in order to remove contaminates like water (just one of a few) and to produce fluids such as gas,kerosene,diesel,tar, etc.. All this is done by heat processes that than break down when certain heat temperatures are achieved. They than seperate through flow lines into each categorized storage tanks that make up each product line.
What he hell is crude oil?