Where does crude oil come from?

Answer

Crude oil is a fossil fuel and, as the name implies, it is derived from fossils. Over time the remains of vegetation and various organisms, such as bacteria and algae, are covered by an increasing amount of soil before they are converted through heat and pressure into matter composed largely of hydrocarbons. This material, known as crude oil or petroleum, is the product of eons of this process.

Scientists believe most of the crude oil extracted today is generated from marine organisms, such as zooplankton and algae. They suspect larger animals may also be part of the mix.

Once these remains begin to change as a result of heat and pressure, they become what geologists refer to as kerogen, a waxy substance. With more heat, kerogen becomes liquid and gas hydrocarbons.

Crude oil hydrocarbons largely consist of cycloalkanes and alkanes, as well as oxygen, nitrogen, sulfur and copper, iron and nickel.

Geologists know where to locate oil reservoirs based on rock formation types. Such formations are characterized by deeply buried source rock containing hydrocarbon material, a permeable reservoir rock for it to gather in and a rock seal to keep the material from reaching the surface before it is extracted with drills and pumps.

Q&A Related to "Where does crude oil come from?"
Crude oil comes from deep in the earths crust. We need to drill down for it and pump it out. It was created by tons and tons of decaying plant and animal materials that piled up over
http://www.ask.com/web-answers/Science/Other/where...
Lots of crude oil comes from under sea, as you might have heard on the news about the U.S.A oil slick, which is causing most sea creatures to die
http://wiki.answers.com/Q/What+has+crude+oil+come+...
Emu oil comes from the emu, a large, flightless, ostrichlike bird. Maybe not the prettiest animal on the block, but Australian aborigines were said to have discovered the benefits
http://www.life123.com/beauty/cosmetic-procedures/...
It comes from oil fields and oceans! whereever oil fields are detected oil wells are drilled to extract oil ! These are organic matter decomposed millions of years ago and changed
http://answers.yahoo.com/question/index?qid=200812...
1 Additional Answer
Ask.com Answer for: where does crude oil come from
Oil was formed from the remains of animals and plants that lived millions of years ago in a marine environment.
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