Uncertainty Flashcards
1
Q
How is reservoir area determined?
A
- seismic
- geological knowledge obtained in the region from other wells or outcrop
- well/production tests combined with reservoir simulation
2
Q
How are reservoir thickness and net-to-gross determined?
A
- seismic
- logs and cores
- cap curves and wireline formation tests (pressure versus depth graphs)
3
Q
How is reservoir porosity determined?
A
- density, neutron and sonic logs
- core
4
Q
How is water saturation determined?
A
- resistivity logs using resistivity interpretation model (Archie, WS, etc.)
- cap curves combined with wireline formation tests
5
Q
Why is Sw often expressed as a saturation height function rather than a single average value in the HCVOL equation?
A
- to ensure a better representation of the transition zone (which can be relatively long in e.g. carbonates)
- to ensure consistency between Volumetrics and the Static and Dynamic models (which also use saturation height functions)
6
Q
What is the only recommended cut-off to differentiate between reservoir and non-reservoir?
A
Vshale cut-off
