Discussion
................. of kerogen is the principal stage of oil formation.
Answer: D
The principal stage of oil formation from kerogen is catagenesis.
Organic matter matures in three stages. During diagenesis, at shallow depth and low temperature, organic matter is converted into kerogen and biogenic methane. During catagenesis, at roughly 50-150 °C, the kerogen is thermally cracked and generates most of the oil and wet gas: this is the 'oil window'. During metagenesis, at still higher temperature, only dry gas (methane) is produced and the residue turns to graphite-like carbon.
Metamorphosis is a biological term for a change of body form and is not a stage of kerogen maturation.
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