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The reservoir rock cuttings can be characterized using mercury intrusion porosimetry (MIP). MIP tests do not yield the permeability of the sample directly; however, MIP results could be used to estimate permeability using empirical equations. Such effort has been attempted in several researches. Most of them have been performed on sandstones or carbonates solely. Therefore, a comprehensive study accounting for both types of reservoir rocks is missing. In the current research, MIP data of 187 sandstone, limestone, and dolomite samples with a wide range of permeability (from 0.001 to 2000 mD), and porosity (from 1 to 32%) taken from 8 Iranian gas and oil fields were used to develop a new generalized equation for estimating uncorrected gas permeability. We have concluded that in addition to the porosity, pore throat radii corresponding to a mercury saturation of 35% (r35) has the highest correlation with the permeability of the samples. The proposed equation was validated by data from another 21 carbonate and 9 sandstone rock samples. A comparison between our equation and other commonly used similar empirical equations showed the proposed equation has the highest precision in the estimation of permeability of all rock types. The findings of this study can be used to predict reservoir rock permeability from easily accessible and inexpensive drill cutting with acceptable precision. Additionally, the proposed equation is applicable in well-log interpretations and reserve determinations.

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Starfish is the first open-source software, specifically developed for simulation of capillary-dominated drainage/imbibition processes in the pore networks extracted from petroleum reservoir rock samples. Written in C++ using parallel computing methods, Starfish is fast and its bug fixes, modifications, and future developments will be simple. With comparing the predictions of Starfish to experimental results, it was found out that the Starfish predictions are in a good match with the experimentally obtained drainage/imbibition data.Keywords Capillary pressure · Iterative linear solver · Open-source project · Pore-scale network modeling · Preconditioner · Relative permeability List of symbols