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A rock sample measures 5 cm in diameter and 10 cm in length. Its porosity is...

A rock sample measures 5 cm in diameter and 10 cm in length. Its porosity is 20% and its permeability is 0.1 darcy. The rock was originally saturated with saline water (specific gravity of 1.1 and viscosity of 1 cp). After 100 ml of oil was injected through the rock, 30 ml of water was collected at outlet. Calculate the water saturation in the rock.

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