The physical properties of sedimentary rocks strongly depend on the geometrical structure of their pore space. Thus, a geometrical analysis of the pore structure can provide valuable information in formation evaluation. In general, these pores form a very complicated three-dimensional network of channels of widely varying size, shape and orientation. However, the pore geometry is directly observable on plane sections through the porous rock only. Therefore, the comprehensive geometrical investigation of the spatial pore system results in a difficult stereological and topological problem. Nevertheless, the first step at all must be to gain as much quantitative information as possible from the plane section itself. Some occasional attempts in this direction have been made in the past (Rose & Wyllie, 1950; Scheidegger, 1961; Perez-Rosales, 1969). However, to make efficient use of the vast statistical information on metrics and topology offered by a section image of the pore space, an automatic morphometric image analysis procedure is needed that can be quickly performed in a digital computer and yields most complete data on the size and shape distribution and the mutual arrangement of individual pore or grain sections. A computer program for such an analysis, that is able to determine a great number of size and shape characteristic quantities of individual image figures and to evaluate them statistically, has been developed by Rink (1970). In addition, Rink (1976) set up a program for an image amending process, "cut ", individualizing narrowly connected figures, thus permitting the application of the individual analysis even to rather continuous-phase images, like real pore system sections.

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