Experimental And Mechanism Study On The Effect Of Clay Minerals On Dielectric Constant Dispersion

The conventional resistivity logging method is based on the Archie formula to calculate the water saturation of the formation,and Archie is suitable for most cases where the formation water resistivity is significantly lower than the oil resistivity.However,on the one hand,due to the properties of the injected water changes in the later stage of oilfield development,the mineralization degree of formation pore water is variable and unknown;on the other hand,the low-contrast oil and gas reservoirs appear due to the presence of fresh water in these formations.Therefore,dielectric logging,as another logging methods to evaluation the water saturation of the formation has increasingly been applied because of its advantages.At present,the basic research on dielectric logging in China is not perfect,and the research on the mechanics of rock is not thorough enough.The dielectric measurement experiments rarely touched on the types and contents of clay minerals.In response to this situation,a total of 16 artificial cores with different clay mineral content and types were designed and manufactured,and the parallel plate capacitance method was used for the sweep dielectric measurement in a wide frequency range of 1 MHz to 1 GHz.The relationship between the core dielectric constant and the mineralization degree,porosity,ion species,water saturation,clay mineral content and clay mineral type of the core was obtained by analyzing experimental data,and the sensitivity coefficients of four factors are calculated,so the dielectric property of the water-bearing rock was studied more comprehensively through this study.In order to explore the more advantageous numerical simulation method of the dielectric dispersion mechanism of rock,the experience of the former application of lattice Boltzmann method in the field of fluid mechanics was deeply studied and borrowed in this study.The useful application of lattice Boltzmann theory in numerical simulation of rock dielectric dispersion mechanism is provided base on the reasonable analogy,which provides a reliable basis for future research in this area.