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The AAPG/Datapages Combined Publications Database
Journal of Petroleum Geology
Abstract
Journal of Petroleum Geology, Vol.
WATER
SATURATION AND EFFECTIVE PORE SIZE OF MUDSTONES
*Exploration Dept., Japan Petroleum Exploration Co. Ltd. Seiwa-Ebisu Bldg. 2F. 1-18-14. Ebisu, Shibuya-ku. Tokyo. Japan.
**Bureau of Economic Geology. The University of Texas at Austin. Austin, Texas 78705, USA.
Abstract
water saturation in mudstone is made by means of a capillary
model of a porous medium using the air and water absolute
permeabilities of a sample. The calculated values of immobile
water saturation of the Tertiary mudstones from Japan tend to
support a generally-accepted concept; virtually all the water in
mudstones is irreducible. Immobile or irreducible water
saturation increases gradually with decrease of porosity of
mudstones; 15% porosity is a critical value beyond which
mudstones contain 100% immobile water
in the pores.
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