Influence Of Artificial Shale Minerals On Dynamic And Static Elastic Parameters And Anisotropy

Based on the analysis of reservoir and mineral characteristics of shale in Sichuan area,mineral analysis of natural shale in Longmaxi Formation is carried out,and three groups of artificial shale with different pyrite content,montmorillonite content and clay mineral composition are designed and manufactured,and then the quality of manufactured artificial shale is analyzed.The dynamic and static elastic parameters of the three groups of artificial shale samples were tested by dynamic and static testing equipment.The data of P-wave velocity,S-wave velocity and stress-strain curve under confining pressure were obtained.The effects of mineral components on dynamic and static elastic parameters and anisotropy were analyzed.The experimental results show that the artificial shale samples have a high similarity with the actual natural shale,and can be used to test the variation law of artificial shale samples instead of natural samples;there are differences between dynamic and static elastic parameters,and with the increase of axial pressure,the Young's modulus and Poisson's ratio of artificial shale samples show an upward trend,and the Young's modulus almost increases linearly with a clear relationship.The dynamic and static conversion formulas of the Young's modulus of the artificial shale in the mineral composition group of variable clay are obtained;the pyrite content in the shale is positively correlated with the Young's modulus,while the montmorillonite content is negatively correlated with the Young's modulus;in the mineral composition group of variable clay,the Young's modulus of the illite group is the largest,the Young's modulus of the kaolin group is the lowest,and the montmorillonite group is close to the illite group.