... and the NaCl interrelationship does not apply. The SP is used for determination of fresh water quality, but firm empirical data for the locale are required. Measurements of resistivity provide the means for determining relative productivities of fresh water sands. Unconsolidated sands generally exhibit...

... been used in the field to show porosity in fractured shale, show fluid zones in cemented sands, distinguish oil zones from water zones in fresh water sands, and locate fluid zones and define oil productive intervals in shaly sands. The drilling mud program should be controlled to produce...