Predicting capillarity of mudrocks

摘要: Abstract This study provides a compilation, evaluation and correlation of published petrophysical datasets determined for 233 rock samples (165 mudrocks, 27 sandstone, 25 carbonate, 11 anhydrite 5 marlstone datasets). With predominant focus on mudrocks review the methods used determination capillary breakthrough snap-off pressures is given. Additionally, based more recent data, previously empirical correlations are critically investigated. Knowledge about these two critical important both, prediction sealing capacity natural gas reservoirs or CO 2 storage sites, but also production estimates from tight shale plays. Capillary pressure experiments, when performed low-permeability core plugs, difficult time consuming. Laboratory measurements plugs under in-situ conditions mostly using nitrogen, with methane carbon dioxide. Therefore, mercury injection porosimetry (MIP) preferably in industry to determine an equivalent value pressure. These have advantage be quick cheap only require cuttings trim samples. When evaluating database detail we find that (1) MIP data plot well drainage sample while conversion system Hg/air gas/brine (e.g. CH 4 , ) interfacial wettability does not provide uniform match, potentially caused by different characteristics; (2) brine permeability versus shows good match could first estimate P c -values since easier than pressures. For imbibition was found measured only; (3) porosity fairly sandstone only, plug-derived sandstones, carbonates evaporates. No such exist mudrocks; (4) air brine-derived permeabilities show excellent (5) do infer any direct between specific surface area (SSA), mineralogy organic content However were able better predict sophisticated model relies combination parameters.