Where does crude oil come from?

Dead critters, plenty of pressure, a lot of heat, and hundreds of thousands of years in time.

Crude oil is formed from the remains of dead organisms (diatoms) such as algae and zooplankton that existed millions of years ago in a marine environment.

How deep underground is crude oil?

Oil seemingly keeps getting deeper and deeper. But that isn’t the total truth. The earliest year where data is available, 1949, shows the average depth of oil wells drilled was 3,500 feet.

Which country has the most oil?

That includes 32 million barrels a day of crude oil only, and 68 million barrels of crude oil, condensates, NGLs and oil from non-conventional sources.