Module 9: Petroleum Geochemistry

Learning Objectives:

• Understand the origin of the gases collected during the drilling processes
• Awareness of wellsite gas data: how it is collected on a rig and measured
• Understand how the data is reported by service companies
• Explain the origin and significance of wellsite gases and what corrections are required to maximise the geological signal.
• Awareness of how to use gas data to spot pay zones
• Understand what cause changes in associated and non-associated gas composition’s
• Example of how to correct wellsite gas data and calibrate it to PVT data
• Appreciate where it can go wrong:
• Reservoir vs non-reservoir zones
• Impact of coring
• Drilling induced effects
• Linkage to Pore Pressure
• Examples & some recommendations on set up