PhaseKinetics

Predicting gas-oil ratio and charge volumes (gas and/or oil) ahead of drilling is a key element of exploration strategy. Estimating the composition of the liquid phase is also critical because sulphur contents, wax contents and TAN all directly affect viscosity, recovery and value.

GEOS4’s exclusive PhaseKinetics compositional kinetics approach quantifies the gas and oil expelled from source kitchens (GOR, CGR), as well as their phase state (1- or 2-phase), under varying P-T conditions along carrier systems.

Tailor-made compositional kinetic models

Source rocks, stains and seeps provided by the customer are analysed in 4 sequential stages to build tailor-made compositional kinetic models:

1. Definition of Petroleum Type Organofacies
   Link between production type and kerogen structure building blocks
2. Definition of Thermal Response
   Generation intensity and breadth in time-temperature space
3. Integration of Compositional Evolution into Thermal Response
   Stepwise petroleum charge compositional evolution
4. Tuning of Compositional Evolution to PVT Format
   Gases and fluids compatible with equations of state

If no samples are available, for example in a frontier exploration area, the petroleum type, thermal response, evolving composition and tuned parameters for the nearest petroleum type organofacies are selected. We can help with this choice.

No Black Boxes: read di Primio, R. and Horsfield, B. (2006) From petroleum-type organofacies to hydrocarbon phase prediction. AAPG Bulletin.
Link to the abstract. Request a copy of the article.