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4. A dry core sample has a weight of 420 g. This core sample is then...

4. A dry core sample has a weight of 420 g. This core sample is then saturated 100% with brine which has a density of 1.05 g/cm3. The weight of the saturated core sample is 450 g. The core sample is 10 cm long and has a diameter of 5 cm. What is the porosity of the core sample?

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Answer #1

Porosity = Pore volume (Vp) / Bulk volume (VB)

Bulk volume is calculated by using the formula, VB = r2l

Where, r = radius of core sample = 5/2 = 2.5cm

   and l = length of the core sample = 10cm

VB = r2l = 3.14 x 2.5 x 2.5 x 10 = 196.25 cm3

The pore volume of the core sample is calculated as:

Vp = Weight of saturated core - Weight of dried core / Specific gravity of brine

Specific gravity = density of any substance/Density of water

Density of water = 1g/cm3

Specific gravity of brine = 1.05/1 = 1.05

Vp = 450 - 420/1.05 = 28.57cm3

Porosity = 196.25/28.57 = 6.87

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