Abstract
Abstract: In order to further our understanding of the physical properties of tight carbonate and to explore the use of NMR to identify different rock types. In this study, we used thin-section observations, SEM (scanning electronic microscopy) data, helium porosity, helium pulse decay permeability, MICP (mercury injection capillary pressure), and NMR (nuclear magnetic resonance) data to conduct petrographic and petrophysical characteristics of tight studies on 12 carbonate samples. Our results show that nano/micropores were widely distributed between the micrite and/or dolomite crystals. The correlation between the permeability and porosity of the tight carbonates was poor, while the rapex, which was the apex of the hyperbola in Pittman (1992), is well correlated with the threshold entry pressure, the maximum pore-throat radius, and the average pore-throat radius. Based on new cut-off values, we have identified three types of pores: nanopores, which mainly correspond to the intercrystalline pores; microp...
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