Carbonate Reservoir Characterization: Part 15
1. Does permeability in a carbonate reservoir depend only on porosity and pore-size?
2. Does fluid saturation in a carbonate reservoir depend only on porosity, pore-size and capillary pressure (which remains to be directly linked to reservoir height through the density difference of the fluids involved)?
3. Does relative permeability in a carbonate reservoir depend only on absolute permeability and fluid saturation?
4. In a carbonate reservoir, how easy would it remain to distinguish between inter-particle porosity (pore space located between grains) and vuggy porosity (pore space not located between grains/crystals?
How exactly to capture the details of separate vugs (vugs that remain inter-connected only through the inter-particle pore network: moldic, intra-particle [intra-crystal, intra-grain, intra-fossil], intra-grain micro-porosity, shelter) and touching vugs (vugs that form an inter-connected pore system: fracture, solution-enlarged fracture, cavernous, breccia, fenestral)?
5. To what extent, Leverett J function, which relates water saturation to capillary pressure (which is a function of reservoir height) and ‘square root of permeability over porosity’ (which is a function of pore size) – would remain to be justified in a carbonate reservoir, which has larger volumes of vuggy porosity, with extensive intra-grain micro-porosity?
Whether permeability and fluid saturations are controlled only by pore-size distribution (which are described by rock fabric descriptions and porosity in carbonate reservoirs with no vuggy porosity)?
6. In a carbonate reservoir, when we make a plot of reservoir height (y-axis) vs fractional water saturation (x-axis), under what circumstances, the profile (a) intersects the x-axis; and (b) remains parallel to x-axis, when the reservoir porosity remains to be high (say, 15 – 20%)? Also, under what circumstances, the profile intersects the x-axis at the minimal fractional water saturation (when the porosity remains to be high)?
7. In a carbonate reservoir, whether a plot between porosity (x-axis) and water saturation (y-axis: logarithmic) always remain to be linear?
Suresh Kumar Govindarajan
https://home.iitm.ac.in/gskumar/
https://iitm.irins.org/profile/61643
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