Determining geologic properties of a rock sample

A system for determining a geologic property of a rock sample, comprising:

• a gas porosimeter configured to determine a grain volume of a solid matrix of a processed rock sample that comprises the solid matrix and a fluid retained within the solid matrix;
• an Archimedes assembly configured to measure a first mass value of the processed rock sample in air and a second mass value of the processed rock sample in a liquid;
• a nuclear magnetic resonance (NMR) measurement device configured to determine one or more NMR measurements of the processed rock sample;
• and
• a control system configured to perform operations comprising:
• (i) determining a volume of the fluid retained within the solid matrix from the one or more NMR measurements;
• (ii) identifying a measured volume of gas space of the processed rock sample from the gas porosimeter;
• (iii) identifying a measured first mass value of the processed rock sample in air and a measured second mass value in the liquid of the processed rock sample from the Archimedes assembly;
• and
• (iv) determining, based at least on the measured volume of the fluid, the measured volume of the gas space, and the measured first and second mass values, at least one of a bulk volume, a bulk density, a grain density, or a porosity of the processed rock sample.