7. Pressure was applied on a rock sample, and the consequent amount of fluid expelled was recorded. The following table provides the details of the recordings: - The dry weight of this sample is 152.8g, and its weight when saturated with an oil of density 0.85g/cm3 is 171.6g. Plot the fractional volume as a function of applied pressure and find the average pore compressibility of this sample Questions 8. (a) Several core plugs (diameter 1 in and length 1.5in ) were taken from a given reservoir. Each was cleaned and its porosity was measured using a given gas expansion porosimeter. Then, all were saturated with brine having a resistivity of 7.5.cm. After that, each core plug was placed in a resistivity apparatus to measure the voltage drop under 0.01 A current. The porosity and voltage drop measured are listed below: - Calculate F and determine the parameters a and m. Questions b) The laboratory procedure was continued using Sample No. 1. The brine saturation was reduced step-by-step by displacing the core plug with oil, and then the voltage drop was measured. - Calculate the resistivity, Rt, as a function of Sw, and determine n. c) Calculate the water saturation when the porosity is 17.8% and the true resistivity is 545.cm. Questions 9. In an attempt to derive Archie's equation parameters, three reservoir rock samples were identified and tested. Length, diameter, and dry weight were measured. The rocks were subjected to strong vacuum and then saturated with brine of 1.04g/cm3 and 7.3.cm resistivity. The saturated weight was then measured. The electrical resistance was measured using a voltmeter with a constant current. Using the data of the three rocks given below, calculate Archie's parameters (a and m)