As a sapropel fuel, oil shale differs from humus fuels in its high content of organic matter with an atomic ratio of hydrogen to carbon of about 1.5--approximately the same as for crude oil and four to five times higher than for coals.
As a sapropel fuel, oil shale differs from humus fuels in its lower content of organic matter. The organic matter has an atomic ratio of hydrogen to carbon of about 1.5--approximately the same as for crude oil and four to five times higher than for coals.