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science.answers.com/Q/How_was_crude_oil_formed

Crude oil is one form of fossil fuel that was formed from biomass, which is decaying plants and animals, over millions of years. Much of the biomass came from water organisms that, when they died, were covered with layers of sediment. Years of pressure and heat transformed the biomass into crude oil and other forms of fuel.

en.wikipedia.org/wiki/Petroleum

The name petroleum covers both naturally occurring unprocessed crude oil and petroleum products that are made up of refined crude oil. A fossil fuel, petroleum is formed when large quantities of dead organisms, mostly zooplankton and algae, are buried underneath sedimentary rock and subjected to both intense heat and pressure.

www.wisegeek.com/what-is-crude-oil.htm

Crude oil is the liquid form of petroleum, natural gas is the gaseous form of petroleum, and oil shale and sands are the semi-solid forms of petroleum. Both petroleum and coal come from decayed organic matter that was compressed underneath layers of sedimentary rock deep below the Earth’s surface.

www.croftsystems.net/oil-gas-blog/what-is-oil-made-of

The beginning of crude oil formation happened millions of years ago. Oil is a fossil fuel that has been formed from a large amount tiny plants and animals such as algae and zooplankton. These organisms fall to the bottom of the sea once they die and over time, get trapped under multiple layers of sand and mud.

www.kids.esdb.bg/oil.html

Oil was formed from the remains of animals and plants that lived millions of years ago in a marine (water) environment before the dinosaurs. Over the years, the remains were covered by layers of mud. Heat and pressure from these layers helped the remains turn into what we today call crude oil.

oilprice.com/Energy/Crude-Oil/What-Is-Crude-Oil-A-Detailed...

Crude oil, commonly known as petroleum, is a liquid found within the Earth comprised of hydrocarbons, organic compounds and small amounts of metal.

www.livescience.com/33087-how-oil-form-petroleum.html

How Does Oil Form? By Natalie Wolchover ... That contains the precursors we find in crude oil," said Peters. Fats last forever. ... "This could be a salt or stone structure that traps oil or gas ...

www.nationalgeographic.org/encyclopedia/petroleum

Petroleum (also known as crude oil or simply oil) is a fossil fuel that was formed from the remains of ancient marine organisms. Millions of years ago, algae and plants lived in shallow seas. After dying and sinking to the seafloor, the organic material mixed with other sediments and was buried.

www.energytrendsinsider.com/research/crude-oil/crude-formation-and...

Crude Formation And Production. How Is Crude Oil Formed? It is generally believed that crude oil was formed from the remains of animals and plants (called biomass) that lived many years ago. Over eons the biomass was covered by layers of mud, silt, and sand that formed into sedimentary rock. Geologic heat and the pressure of the overlying rock ...

www.adventuresinenergy.org/.../how-are-oil-natural-gas-formed.html

More heat produced lighter oil. Even higher heat or biomass made predominantly of plant material produced natural gas. Stage 3 - After oil and natural gas were formed, they tended to migrate through tiny pores in the surrounding rock. Some oil and natural gas migrated all the way to the surface and escaped.