Tthe porosity of (a) cubic packing is 47.6% and (b) rhombic packing of spheres is 25.96 %. hint: the angle for cubic packing is 90° and that for rhombic is 45°. (10) 7. a cylindrical core sample was subjected to the following linear flow conditions. calculate the permeability of the core sample (10) l = 10 cm p1-58.8 psia h 1.0 cp p2-14.7 psia diameter = 2.0 cm flow rate 0.20 cu. cm/sec how much surface tank oil exists in the following oil field? area of the field = 480 acres; average carbonate reservoir thickness : 50 oil formation volume factor 1.25. (10) 8, average porosity-18%; average connate water 30%, and 9. using excel plot depth (ft) vs. pressure (psi) plot for a fresh-water system (sg 1.0), for a salt- water system (sg = 1.12) and for a drilling fluid system (sg = 1.25). (15) 10. show that the static pressure of a gas column at depth h (h2-h) can be estimated by the following equation: (15) 0.01875gh avg avg . p2 pressure at depth h2; p, pressure at depth hi; ggas gravity (air 1.0) h2-h1 = true vertical depth interval, ft = zaggas compressibility factor for average pressure a tanaverage temperature of gas column, °r (460 + of) between h2 and h ype text]