The Tight Sandstone’s Static And Dynamic Rock Physical Characteristics Experimental Study

Based on the previous study, using rock physics theory as a guide and combining rock physical experiment and the experimental data statistics and analysis on the Chang Qing Su Geli tight sand reservoir and Xin Jiang tight sand reservoir to do the rock physics characteristics of the systemic research. On the basis of experiment, this paper analyzes the microstructure characteristics of tight sandstone, petrological charac-teristics, physical property; Analyzes the dynamic acoustic characteristics and influencing factors of tight sandstone, anisotropic characteristics, conform to the speed of the reservoir calculation model is established; Analyzes the static mechanics characteristics and influence factors of tight sandstone brittleness parameter determination and the brittleness of the reservoir evaluation; Established the link between the dynamic elastic parameters and static elastic parameters model.For research purpose, rock physics experimental design was carried out. Content includes:(1)the core production;(2)the petropgysical parameter experiment, such as porosity, permeability, whole rock analysis test;(3)the elastic parameter experiment,test of rock under different confining pressure, pore pressure, axial pressure,saturated fluid state of sonic wave velocity, and calculate the modulus of elasticity;(4)the elastic rock mechanics parameter test, under the condition of simulated formation process through the triaxial compression experiment curve of rock can be obtained under the condition of triaxial compression modulus and deformation modulus, the strength of three axis, mechanical parameters such as poisson’s ratio. The above is to lay a good foundation for further analysis of the physics.On the basis of experimental data, the petrophysical characteristics of tight sandstone in Chang Qing and Xin Jiang carried on the thorough analysis and research.(1)It analyzes the petrology characteristics and physical property characteristics of tight sandstone, According to the experimental data(physical property parameters, lithology, and pore structure) analyze minerals on the reservoir rock and pore characteristics, reservoir permeability, and found the tight sandstone porosity associated with clay content. Because with the increase of clay content porosity and permeability are presented inverted “V” type change trend, the relationship between permeability and porosity were positively correlated, so this kind of change trend and dense sandstone from the calcium base consolidation to argillaceous cementation.(2)Through experimental data( physical parameters, sonic wave velocity, microstructure parameter) tight sandstone dynamic elastic parameters is analyzed and fitting the ealationship model in the region, including density and speed, longitudinal wave velocity and the relation between the shear wave velocity.(3)Based on static mechanics test data, the paper analyzes the static elastic characteristics of tight sandstone in the study arear, further analyzes the characteristics of rock mechanics parameters influencing factors. Combing with tight sandstone above analysis and research to establish the tight sand dynamic elastic parameters and the relationship between the static elastic parameters of the model, the model.(4) The evaluation of brittle calculation and brittle also provide reference for oil and gas development in the study area.