Abstract
Several laboratory measurements were conducted to characterize the multiscale pore structure of saline-lacustrine carbonate reservoir, which is dominated by the intercrystalline pore, dissolution pore and microfracture. Pore system could be separated into small and large pore systems by Rapex obtained from high-pressure mercury intrusion (HPMI). Rapex is defined as the pore-throat radius corresponding to the maximum ratio of mercury saturation and capillary pressure. Large pore system (>Rapex) provides a small fraction of porosity, but makes a significant contribution to the permeability. Rapex also distinguishes the fractal characteristics of small and large pores. Small pores could be accurately characterized as fractal characteristics by HPMI results, whereas the fractal characteristics of large pores could be properly presented by nuclear magnetic resonance (NMR) measurement. N2 gas adsorption captures the fractal characteristics of nanopores. Due to the limitations of each method, a combination method is encouraged to fully characterize the pore structure.
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