A method to probe the pore-throat structure of tight reservoirs based on low-field NMR: Insights from a cylindrical pore model

摘要

This research proposes a new method of estimating pore-throat size distribution that converted based on nuclear magnetic resonance (NMR) T-2 spectra, so as to more accurately explore the pore-throat structures of tight reservoirs. In this work, one of the most potential shale formations, Yanchang shales in the Ordos basin, NW China, was targeted. Take Chang 2 Member as an example, the experimental parameters were comprehensively analyzed, including petrological property analysis, NMR, and constant-rate mercury injection porosimetry (MIP).