Please evaluate the accurate answer of the following question
Question- a chalk core plug having a pore volume of 17.0307 cm3 is fully saturated with reservoir brine. A synthetic oil (Isopar-L) flood is conducted on this plug. it is found that 12.25 cm3 of reservoir brine was displaced from this plug by the Isopar-L. After reaching this value, no further reservoir brine could be displaced from the core plug.
Part 1- What is the connate water or irreducible water saturation of this core plug?
I want help to calculate the connate water of this core plug.