Study on core dielectric characteristics and saturation model

The relative dielectric constant of artificial sandstone core was measured, and the relationship between relative permittivity and saturation, porosity and mineralization were studied in the frequency band of 20～1 000 MHz. The results show that the core's relative permittivity has a good linear relationship with saturation and porosity, and the mineralization has a great influence on the relative dielectric constant at low frequency. Based on the analysis of experimental data, combined with the existing dielectric saturation model and based on Maxwell-Garnett theory, a multi-frequency dielectric mixed interpretation model suitable for sandstone is presented.