Project description: Tight oil and gas reservoirs, as the main body of oil and gas production in my country in the future, have become a hot topic of research at home and abroad. However, due to its complex microscopic pore structure system, wide pore throat fracture scale distribution range, and development of micro-fractures, it leads to strong microscopic heterogeneity and complex and changeable fluid seepage characteristics, which restrict the quality of unconventional oil and gas reservoirs and affect the design of development plans. The high and stable production of such reservoirs has become a research difficulty at home and abroad. At present, the microscopic dynamic characterization and enhanced oil recovery of tight oil and gas reservoirs mainly rely on testing methods and macro numerical and physical simulations. The main problems are that existing research mainly focuses on static evaluation of microscopic characteristics, ignoring the characteristics of dynamic changes and mutual influence between microscopic pore structure and fluids. However, it is difficult for numerical simulation to completely characterize the complex pore throat crack network model, and the simulation results are quite different from the actual situation, which makes it difficult to essentially reveal the constraints that restrict the dynamic occurrence and changes of fluids, and then "targeted" and give priority to suitable enhanced oil recovery technology. This product targets different types of tight oil and gas reservoirs, based on the advantages and disadvantages of different methods, effectively integrates multiple means to determine the key factors that restrict the quality of the reservoir. On this basis, the influence degree of each factor is fully considered to establish the mathematical characterization model of the pore throat fracture system to realize the quantitative characterization of the pore throat fracture system. Based on the above research, visual displacement, high-pressure nuclear magnetic resonance displacement and CT scanning displacement technology were combined to visually depict and quantitatively characterize the fluid occurrence state and production effect under the collaborative action of multiple methods + multiple injection media. At the same time, the change laws of pore throat and fracture system parameters during different displacement processes were quantitatively evaluated, and a mathematical prediction model was constructed to realize dynamic transient real-time prediction of microscopic pore structure and fluid occurrence. Mature technologies have been formed to effectively improve the development effect of tight oil and gas reservoirs. This achievement has 13 national invention patents and can be applied to the fields of oil and gas accumulation, oil and gas development and tertiary oil recovery. It has broad market application prospects and good economic benefit value.  Innovative: This product essentially reveals the key factors that restrict the development effect of tight oil and gas reservoirs, and proposes transient real-time prediction models for oil and gas under different conditions and parameters; and through optimization of methods and parameters, it has formed an enhanced oil recovery technology suitable for different types of tight oil and gas reservoirs, breaking through the current technical bottleneck of tight oil and gas reservoir development. (1) A dynamic and static prediction model for the microscopic pore system of tight oil and gas reservoirs has been established;(2) A transient real-time prediction model for oil and gas in the micro-nano pore space of tight oil and gas reservoirs has been constructed;(3) A complete set of enhanced oil recovery technologies has been formed to effectively improve the development effect of tight oil and gas reservoirs.