Background theory
Under subsurface reservoir conditions, petroleum may exist as a single vapour phase, as in gas accumulations, a single liquid phase, as exemplified by undersaturated crude oils, or a two-phase system where a gas cap is in equilibrium with an underlying oil leg.
Being able to predict gas-oil ratio and bulk petroleum phase volumes ahead of drilling is a crucial yet very poorly constrained element of exploration strategy.
Predicting the composition of the liquid phase is also critical because sulphur contents, wax contents and TAN all directly affect viscosity, recovery and price per barrel.
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