Module 9: Petroleum Geochemistry: Well Site Gas Analysis

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