Porosity and pore size distribution are crucial parameters which are required to calculate reservoir volume as well as to evaluate producibility. In mudrocks, these measurements are challenging due to the presence of fine grains, small pores, high clay content, swelling clay minerals, pores hosted in organic content, and possibly, mixed wettability. We used samples from the Monterey, Haynesville, Niobrara and Eastern European Silurian Formations. We measured porosity and pore/throat size distribution (PSD) of the samples using the subcritical nitrogen gas adsorption (N2) analysis at 77.3 K, the mercury intrusion (MI), and the low-field (2 MHz) nuclear magnetic resonance (NMR). Porosity was also measured with the water immersion (WI) and the helium porosimetry (GRI) techniques. The effect of texture and rock matrix components on porosity and pore-size distribution have been studied considering clay content and type, and total organic carbon (TOC).

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