Noun
English Wikipedia has an article on:kerogenWikipedia
kerogen (plural kerogens)
any organic matter present in a sedimentary rock that is insoluble in organic solvents; the precursor of oil and natural gas
Oil shales vary considerably in their mineral content, chemical composition, age, type of kerogen, and depositional history and not all oil shales would necessarily be classified as shales in the strict sense. Source: Internet
Most conversion technologies involve heating shale in the absence of oxygen to a temperature at which kerogen decomposes (pyrolyses) into gas, condensable oil, and a solid residue. Source: Internet
Since extraction technologies develop continuously, planners can only estimate the amount of recoverable kerogen. Source: Internet
The sediments, as defined in this diagram, do not include the ~70 million GtC of carbonate rock and kerogen Under terrestrial conditions, conversion of one element to another is very rare. Source: Internet
This estimate considers varying levels of kerogen quality and extraction efficiency. Source: Internet