Page 94 - Geology of Carbonate Reservoirs

REVIEW QUESTIONS 75

Is naphthenic acid the wetting fluid in either case? If yes, which one and

why?

3.7. What is the expression for adhesion tension — A T ?

3.8. Explain the physical meaning of A T in plain language.

3.9. Write the expression for capillary pressure, P c , and explain the meaning of
each term. Is there a relationship between P c and wettability? What is it?
3.10. What are three different kinds of information that can be obtained from MICP

curves?
3.11. What does a “ flat ” mercury pressure trajectory through a given range of pres-

sures reveal about pore throat sorting in that portion of the sample?

3.12. You have air – mercury MICP data from the laboratory and you want to use it

to calculate the height of an oil column in your reservoir. The laboratory P c

(displacement pressure) of the reservoir rock is given as 1200 psi Hg/air, oil in
3
the reservoir is 38 ° API oil with a density of 0.876 g/cm , and water in the res-
3
ervoir is brine with a density of 1.110 g/cm . What is the height of the oil
column?

3.13. Is it possible to test the capacity, or “ sealing strength, ” of the rock that confi nes

fluids in a reservoir? How?
3.14. What is meant by “ snap - off ” ?

3.15. In what ways do the following pore system attributes infl uence reservoir

quality: accessibility, coordination number, pore/pore throat ratio, and pore
throat roughness?