The fraction of water in a given pore space. It is expressed in volume/volume, percent or
saturation units. Unless otherwise stated, water saturation is the fraction of formation
water in the undisturbed zone. The saturation is known as the total water saturation if the
pore space is the total porosity, and the effective water saturation if the pore space is the
effective porosity. If used without qualification, the term usually refers to the effective
water saturation.
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