Carbonate Reservoir Characterization: Part 16

1.     In a carbonate reservoir, when we plot, relative permeability (y-axis) vs fractional water saturation (which can be correlated with reservoir height vs fractional water saturation), what exactly dictates the reservoir height pertaining to (a) only water production; (b) both oil and water production; and (c) only oil production?

2.     How exactly to determine the displacement pressure as a function of average particle size for a vuggy carbonate reservoir?

Will it still follow the exponential profile?

3.     In a vuggy carbonate reservoir, when we plot, permeability (y-axis: logarithmic) against inter-particle porosity, will it still follow a linear relation for various particle-size groups?

4.     In a carbonate reservoir, what exactly dictates the slope of the profile between logarithmic permeability and porosity?

5.     Whether characterization of a carbonate reservoir will remain to be significantly different for reservoirs composed of (a) grain-stones; (b) dolo-grain-stones; (c) grain dominated pack-stones; (d) grain dominated dolo-pack-stones; (e) mud dominated dolo-stones; (f) mud-dominated limestones; and (g) mud-dominated dolo-stones? Whether, permeability (as a function of fractional inter-particle porosity) and initial water saturation (as a function of reservoir height and porosity) in a carbonate reservoir is going to be highly reservoir specific?

6.     How easy would it remain to estimate the permeability of a carbonate reservoir as a function of inter-particle porosity (total porosity – separate vug porosity) only, which eliminates separate-vug porosity?

How do we capture the effects of separate vugs on permeability and initial water saturation?

Feasible to have a control over the pore sizes that connects the intra-particle and inter-particle pore space?

7.     How easy would it remain to relate the rock fabrics of a carbonate reservoir with that of the petro-physical properties, secured from core and wireline log data, in multiple dimensions, using geologic processes and stratigraphic principles?

8.     How easy would it remain to distinguish between inter-particle pore-size and intra-particle pore size (separate vugs) – in a carbonate reservoir?

Suresh Kumar Govindarajan

https://home.iitm.ac.in/gskumar/

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