Petroleum is a naturally occurring, yellow-to-black liquid found in geological
formations ..... The exact molecular composition of crude oil varies widely from
formation to formation but the proport...
Stage 1 - All of the oil and gas we use today began as microscopic plants and
animals living in the ocean millions of years ago. As these microscopic plants
Sep 5, 2014 ... A fast paced explanation of how many oil and gas deposits form and how we
explore for them.
A BBC Bitesize secondary school revision resource for Standard Grade
Chemistry on how crude oil was formed: fossil fuels, porous rock, non-porous
Jul 17, 2015 ... Deep in the Earth, oil and natural gas are formed from organic matter from dead
plants and animals. These hydrocarbonsThe final phase in ...
The Slow Formation of Oil and Natural Gas Deposits. It takes millions of years for
decaying organic matter to be transformed into hydrocarbons within source ...
Jun 10, 2008 ... This animation demonstrates the formation of hydrocarbons over millions of years
in the depths of the Earth. Oil and gas forms in sedimentary ...
Oct 10, 2005 ... But where does oil really come from, and how much is left? ... the "biogenic
theory" of petroleum formation and was first proposed by a Russian ...
Mar 2, 2011 ... Almost all geochemists believe petroleum results from a few million years of
decay of once-living organisms. "We can tell that by looking at ...
Oil and gas are important fossil fuels formed from the decomposition and
pressurisation of algae, plankton and other organisms. This process forms ...