Three Main Stages of the Evolution of OM
1. Diagenesis
2. Catagenesis
3. Metagenesis
Diagenesis
- shallow depths
- microbial activity & compaction predominate
- transformation starts:
*biochemical degradation
*polycondensation
*insolubilization
- first million years
- stage that composition of the kerogen & geochemical fossil is determined
Catagenesis
- OM increasing temperatures
- Microbial activity ceases
- oil, wet gas and methane is produced
- principal zone of oil and wet gas formation
Metagenesis
- occurs at great depths
- coal transformation to anthracite
- 200-400 million years
- cracking occurs in this stage
- no interest (dry gas & thermal methane)
- post-mature and pre-metamorphism stage
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