We computationally investigate cross-property correlations linking fluid permeability to conductive properties in sedimentary rock for a number of pore size parameters based on three-dimensional digitized rock images. In particular, we focus on correlations based on the pore volume-to-surface-area ratio , a critical channel diameter associated with mercury porosimetry measurements, length scales associated with the nuclear magnetic resonance relaxation time , as well as the mean survival time . Differences between the length scales are discussed. All these correlations yield good agreement with our simulations, but permeability estimates based on the critical diameter are found to be most reliable.