Characterization of fluid occurrence states in Shale reservoirs: Centrifugal-nuclear magnetic resonance experimental analysis

The occurrence states of fluids in shale reservoirs directly influence the resource assessment of shale gas, reservoir permeability, selection of development technologies, and economic benefits. Accurate analysis of fluid occurrence states is a key foundation for the efficient exploration and development of shale gas. To comprehensively elucidate the fluid distribution characteristics within shale pores, this study integrates centrifugation-nuclear magnetic resonance (NMR) experiments with stepwise thermal drying and methane adsorption analyses. By examining the NMR T₂ spectra of shale samples under varying centrifugal speeds, the distinction between movable and bound fluids is established, clarifying the influence of pore structure on fluid occurrence. Quantitative relationships between pore size and adsorbed/free gas are further investigated through methane adsorption experiments. Results demonstrate that centrifugation progressively removes water from macropores and microfractures, l..., , # Data from: Characterization of fluid occurrence states in Shale reservoirs: Centrifugal-nuclear magnetic resonance experimental analysis Dataset DOI: [10.5061/dryad.6t1g1jxbj](10.5061/dryad.6t1g1jxbj) ## Description of the data and file structure This document provides detailed information about the raw data underlying Figure 1 to 5 from the study *\"Characterization of Fluid Occurrence States in Shale Reservoirs: Centrifugal-Nuclear Magnetic Resonance Experimental Analysis\"*. The data is derived from experimental analyses, including centrifugation-NMR, porosity measurements, and methane adsorption tests on shale samples. All data is structured to support reproducibility and further research. The experimental principles and detailed operational procedures have been comprehensively described in the article. This document solely contains the experimental data for verification of results or direct use by all parties. ### Files and variables #### File: Raw_data.opju **Description:*...,