Reservoir Properties of Low-Permeable Carbonate Rocks: Experimental Features

摘要: This paper presents an integrated petrophysical characterization of a representative set complex carbonate reservoir rock samples with porosity less than 3% and permeability 1 mD. Laboratory methods used in this study included both bulk measurements multiscale void space characterization. Bulk techniques gas volumetric nuclear magnetic resonance (NMR), liquid saturation (LS), porosity, pressure-pulse decay (PDP), pseudo-steady-state (PSS). Imaging consisted thin-section petrography, computed X-ray macro- microtomography, scanning electron microscopy (SEM). Mercury injection capillary pressure (MICP) porosimetry was proxy technique between imaging. The target whole cores, core plugs, mini chips, crushed rock. research yielded several findings for the samples. NMR most appropriate total determination. MICP matched imaging results highlighted different effects solvent extraction on throat size distribution. PDP core-plug were consistent but overestimated comparison to PSS results, difference reaching two orders magnitude. SEM proved be only feasible method void-scale spatial resolution up 5 nm. confirmed presence natural voids major types. first type organic matter (OM)-hosted pores, dimensions 500 second sporadic mineral matrix (biogenic clasts), rarely larger 250 Comparisons whole-core properties showed substantial differences (by factor 2) (up 4 magnitude) caused by heterogeneity scaling.