In this study, we investigate the pore space of a sample of the Portland sandstone using various methods with different resolution, and based on different physical principles (Mercury injection capillary pressure, MICP, Micro-computed tomography, µ-CT, and Spectral induced polarization, SIP). According to their physical principles, each method provides either the pore body size (µ-CT) or the pore throat size (MICP and SIP). Moreover MICP characterizes the pore-throat radii, whereas SIP rather gives the pore-throat lengths. The objective of this work was to compare results provided by each technique in a common parameter framework. The comparison approach between the different techniques is based on the relationships of 'the incremental porosity - pore size'. Our results show that the recovered porosity can increase when using a method with higher resolution. We believe each method gives a specific attribute of the pore space topology similar to reflector attributes obtained in exploration seismology. We also believe that extensive works must be done to improve our understanding of these attributes to better characterize the pores space topology, and, consequently to better predict the transport and storage properties of soils, rocks and sediments.