Several techniques are used to determine the interstitial water salinity of sedimentary rocks. There are direct methods, such as the atomic absorption spectrometry, and indirect ones, such as the measurement of electrical conductivity or resistivity. This resistivity or conductivity can be converted to NaCl equivalent concentration. Artificial shaly muds, made up of sieved, pulverized core fragments, were filtered in low pressure cells to obtain mud filtrates or effluents; from these, comparisons were made of salt retention or liberation by the clay minerals present in the muds. In addition to the salt filtration efficiency, one can also estimate the resistivity of the water bound or absorbed to the clay particles (Rwb).

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