User:Shubham duhoon/sandbox

Resource availability




The World's natural oil supply is fixed because petroleum is naturally formed far too slowly to be replaced at the rate at

which it is being extracted. Over many millions of years, plankton, bacteria, and other plant and animal matter became buried in sediments on

the ocean floor. When conditions were right – a lack of oxygen for decomposition, and sufficient depth and temperature of burial – these organic

remains were converted into petroleum compounds, while the sediment accompanying them was converted into sandstone, siltstone, and other

porous sedimentary rock. When capped by impermeable rocks such as shale, salt, or igneous intrusions, they formed the petroleum reservoirs

which are exploited today.