Oil and gas formation begins with the accumulation of organics on the sea-floor; these are the dead remains of organisms living in the water column, such as microscopic plankton, which rain down on the sea floor below. This will only occur in rather unusual settings, where the sea floor is stagnant such that there is no oxygen present to break the organic remains down and no sea-floor dwelling organisms present that might feed on the organics. A high sediment accumulation rate of may also help to bury the organics before the action of decay can break them down. As the sediment pile becomes deeper the organics within it are subjected to heat and pressure which leads to formation of oil and then gas. For oil and gas extraction, it is important that the source rock is not 'over-cooked' or the hydrocarbons will be destroyed. There must be suitable reservoir-rock, such as a porous sandstone, into which the hydrocarbons can migrate and accumulate. This must be overlain by an impervious cap-rock, such as a clay, which prevents the hydrocarbons from escaping to the surface. Finally, the geometry of the reservoir and cap-rock bodies must be such that the hydrocarbons become trapped; usually folding will suffice.
Conventional wisdom is that crude oil and coal have been formed from the remains of sea creatures and plants that were buried millions of years ago and underwent changes while subjected to heat and pressure. Coal usually contains some evidence of this in the form of fossils. Natural gas deposits are also assumed to have come from these sources.
Coal are formed from plants & Petroleum products are formed from sea creatures.
oil
Crude oil
petroleum
Oil
fossil fuel
Fossil Fuels
Coal is a solid fossil fuel formed in ancient swamps from the remains of plants and animals under great heat and pressure over millions of years. A liquid fossil fuel formed in oceans from the remains of plants and animals under great heat and pressure of millions of years is called oil.
fossil fuels
Fossil fuels
fossil fuels
Coal was formed from the remains of swamp plants :D
it was formed by sea plants and creatures
scientists think that petroleum formed from the remains of plankton and other microscopic protists, plants, and animals living in shallow seas millions of years ago. The remains of these organisms settled on the ocean floor and were covered by sediments. Over millions of years, the pressure and heat produced by the sediments coverted the remains of these organisms into a syrupy liquid.
Fossil Fuels such as coal, oil, and natural gas.
Giant ferns and other plants formed vast swampy forests, the remains of those ancient plants formed thick deposits of sediment that changed into coal over millions of years giving carboniferous its name
parhaps fossils, roots, ashes or even new compost