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Quantitative analysis of the porous structure of a petroleum reservoir

A thorough understanding of the petroleum behavior in a reservoir, requires one to know more about the porous microstructure of the host rocks. Global porosity as measured by physico-chemical methods is sometimes unable to account for poor recoveries during exploitation. An alternative is to use microscopy and image analysis for computing local porosity and its geometric characteristics. Geometrical measures can serve as an input to physical models. Therefore a contrasted image of the porosity must be acquired. Such images are generally obtained with epoxy resin impregnation and visible light microscopy. Ehrlich et al. (1991), Yanuka et al. (1984) or Habesh (1990) have shown applications on thin sections in sandstones yielding useful information on pores in the 100[mu]m to 10 mm range. In this paper, the authors illustrate a quantitative analysis on a chalk reservoir, wherein the most significant porosity is in the 1[mu]m to 10[mu]m range. The possibility to illustrate throats with a resolution of 0.03[mu]m gives access to a two-dimensional estimation of the capillary pressure.