The PVT and phase behavior studies of reservoir fluids are normally conducted regardless of existing residual fluids. For example, a single-phase gas reservoir is considered to be single phase with no thermodynamic interaction between bulk gas and residual oil phases. However, from thermodynamic point of view, any phase that exist in a system must be considered in phase behavior studies.This question is targeting this approach and asks the experts to share their knowledge and experience on this subject.
In case where pores become very small, like in some unconventionals, then the phase behavior depends explicitly on the size of pores. More generally speaking, when the size of pores becomes comparable to inter and intramolecular interactions and surface forces, then interaction between rock and fluids can have a large influence on the phase behavior. For instance freezing/melting point of fluids can be very different in nano-pores. A respective method to determine pore size distributions in this way is termed thermoporometry. But for that effect, we talk typically of pore sizes smaller than 1 micrometer or more 100 nm or so.
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