Organic Thermal Maturity

Spores/pollen coloration

Palynomorphs in OMA well

Thermal Alteration Index (TAI)

Vitrinite Reflectance (% R₀)

Immature

1

1+

2−

2

2+

3−

3

3+

4−

4

5

0.2%

0.3%

0.5%

0.9%

1.3%

2.0%

2.5%

Mature phase; onset generation of oil

Dry gas to Barren