高黏土陆相页岩实验技术及其应用OA北大核心CSTPCD

Experimental evaluation of"4 properties"of shale reservoir is important foundation and core of shale oil exploration and development.Existing experimental techniques face challenges of inaccurate measurement of shale oil content,small visual field and poor representativeness of micro-nano pores measurement,and lack of direct pa-rameters for fluidity measurement,which cannot meet the requirements for Gulong shale oil production.Through re-search and development of experimental equipment and determination of experimental conditions,"4 properties"experimental technique and its process are established based on pressure-maintainance sealed cores.The results show that measured oil content losses of highly mature and mature Gulong shale oil are respectively 71%and 50%lower than that measured by national standard method.New established restoration model for oil content of shale with different maturity is applied to restore shale oil content data from method of national standard on-site mud log-ging.Quantitative characteristics of kerogen organic matter,oil and water with different occurrence states of shale in high-maturity and low-maturity stages are significantly different,being controlled by transformation and evolution degree of kerogen organic matter to shale oil.Pores-fractures combination of shale constitutes large-scale accumula-tion space and flow paths network.Reservoir space is divided into 2 classes of matrix pores and fractures,including 7 subclasses and 12 types,with total porosity higher than that of siltstone,limestone and dolomite.Oil-bearing property and fluidity characteristics of upper,middle and lower shale oil reservoirs are determined,and oil dis-placement rate of cylindrical shale samples is 16%～43%.Supercritical CO2 displacement at same formation temper-ature(100℃)and different displacement pressures(10～50 MPa)increases porosity by 4.51%and permeability by 0.53×10-3 μm2.The research provides experimental evidence for large-scale reserves increase and beneficial produc-tion increase of shale oil.