Geochem key datas

Question 1

What are the pyrolysis Tmax parameters for Immature, early mature, mature (oil window), late mature, wet gas and post mature?

Answer 1

Immature - 400-430 degrees
Early mature - 430-440 degrees
Mature - 440-450 degrees
Late mature - 450-460 degrees
Wet gas 460-480 degrees
Post mature 480+ degrees

Question 2

What are the Vitrinite Ro parameters for Immature, early mature, mature (oil window), late mature, wet gas and post mature?

Answer 2

Immature - 0.2-0.5
Early mature - 0.5-0.7
Mature - 0.7-1.0
Late mature - 1.0-1.3
Wet gas - 1.3-2.0
Post mature - 2.0+

Question 3

What are the HI values for gas, gas and oil, oil and gas and oil?

Answer 3

Gas - 0-200
Gas and oil - 200-400
Oil and gas - 400-600
Oil - 600+

Question 4

Define the values of S2 yield that indicate poor, fair, good and rich source potential

Answer 4

Poor - 0-2 kg/ton
Fair - 2-5 kg/ton
Good - 5-10 kg/ton
Rich - > 10 kg/ton

Question 5

What type of hydrocarbon would be produced from amorphous, algal, herbaceous and exinite?

Answer 5

Oil

Question 6

What type of hydrocarbon would be produced from vitrinite and inertinite?

Answer 6

Vitrinite - gas

Inertinite - dry gas (limited)

Question 7

What are the TOC values for poor, fair, good, very good and excellent generation potential in shales?

Answer 7

Poor: 0 - 0.5
Fair: 0.5 - 1
Good: 1 - 2
Very good: 2 - 5
Excellent: > 5.0

Question 8

What depositional environments are suggested by

• Pr Ph
• Pr nC18 and Pr nC17, Ph Ph

Answer 8

• Aquatic: Lacustrine, shallow marine
• Reducing/hypersaline
• Terrestrial