In petroleum geology, source rock refers to rocks from which hydrocarbons have been generated or are capable of being generated. They form one of the necessary elements of a working petroleum system. They are organic-rich sediments that may have been deposited in a variety of environments including deep water marine, lacustrine and deltaic. Oil shale can be regarded as an organic-rich but immature source rock from which little or no oil has been generated and expelled.
Read more about Source Rock: Types of Source Rock, Maturation and Expulsion, Mapping Source Rocks in Sedimentary Basins, World Class Source Rock, See Also
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