Pore Space Connectivity in Different Rock-Physics Methods—Similarity and Differences

This study is focused on the analysis of pore space connectivity in reservoir rocks. parameter vital importance for oil and gas industry since it controls hydraulic permeability. Five methods rock physics are used this goal. Three these (self-consistent version generalized singular approximation, Berryman self-consistent method, differential scheme) take into account implicitly. The other two methods, f-model approximation a similar modification method suggested work, allow quantifying via special (f-parameter). In order to reveal physical meaning parameter, simple models carbonate (porous-cracked limestone) considered. first model double porosity containing spherical pores cracks. second contains only pores, their expressed f-parameter. cracks filled with brine gas. Application groups modeling effective elastic properties gives possibility relating f-parameter characteristics pores. shown be controlled by relative crack volume total space. An increase density leads an A good correlation demonstrated. It that range 2–20%, relationship between ε, general, has form f=alog10(ε)2+blog10(ε)+c ε≤εmin. For less than εmin can approximated constant value fmin. values fmin coefficients a, b, c depend saturation type, pair finding link. These results give f-models advantage searching zones enhanced permeability ability filtrate fluids.