Abstract
A computer model of a porous medium is described. Written in FORTRAN, it consists of a three-dimensional array of cubes and cylinders representing pores and throats, respectively. The pore-size distribution (p.s.d.) is calculated from the mercury porosimetry curve of Clashac outcrop sandstone, a relatively clay-free, well characterised rock. Surface area and porosity are calculated from the program and the original porosimetry curve is simulated as a check of the p.s.d. Fifty values of the tortuosity factor of the sandstone are then simulated via a weighted random walk through the model. The tortuosity is then defined as the median of the resulting distribution. The tortuosity is simulated for two different cases of an assumed potential field.
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