Petroleum is defined as any mixture of hydrocarbons that can be recovered from a drill pipe (Sephton A. & Hazen M, 2013). It occurs in form of oil and gas which mainly have a chemical composition of hydrocarbons of various carbon chains. Origin. By referring to different grounds from two opposing theoretical hypothesis, petroleum origin and formation still become a polarized topic of scientists’ debates. The U.S. was the world's dominant oil producer at that time. It regulated prices. Domestic oil was plentiful. Cheap oil and gas made the expansion of interstate highways, interstate trucking, and auto ownership part of the American Dream. But multiple changes have occurred since then. The worst gas prices in U.S. history came only a few years ago, topping out at $3.64 per gallon in 2012 (equivalent to $3.80 per gallon today). However, let’s not forget the very intense and rapid price increase preceding the 2009 recession.