Discussion
The correct order of the three stages of transformation of organic matter into hydrocarbons.
Answer: B
The correct order is diagenesis - catagenesis - metagenesis.
In diagenesis, at shallow depth and low temperature, organic matter is altered by bacteria and chemical reactions into kerogen, with some biogenic methane. In catagenesis, at greater depth and about 50-150°C, kerogen is thermally cracked to oil and then wet gas: this is the oil window. In metagenesis, at still higher temperature, the remaining material yields only dry gas (methane) and residual carbon.
The other orders put catagenesis or metagenesis first, which is impossible, since kerogen must form in diagenesis before it can be cracked to hydrocarbons.
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