| Reservoir rocks are the focus and difficulty of research in the field of oil and gas exploration.In the subsurface reservoir rocks are always in a complex and variable diagenetic environment,constantly undergoing a variety of complex chemical and physical processes,and their macroscopic physical properties can be affected by a variety of factors such as diagenetic environment and sedimentary diagenetic processes.Traditional rock physics experiments are difficult to carry out relevant research.Digital rock modeling can not only make up for the defects of traditional rock physics experiments,but also obtain the micro pore structure of rock,which provides a new idea of research from the micro scale.In this thesis,Discrete Element Method(DEM)and mathematical morphology algorithm are used to model the sedimentary and diagenetic process of rock,and elastic and percolation property numerical simulation is carried out with AVZIO and COMSOL software to study the influence of three different diagenetic processes on elastic parameters and absolute permeability.The study shows that the permeability curves of different diagenetic processes basically coincide,but the elastic parameters are obviously different,and the elastic parameters of compaction process are obviously higher than that of cementation process.In addition,a variety of porous media models with fractures were constructed based on the existing models.Based on the quasi-static hydromechanical approach,the effects of fracture dip angle,fracture thickness and fracture diameter on the dispersion and attenuation of elastic modulus were studied,and compared with the double-pore squirt flow model proposed by Gurevich.The results show that for the squirt flow model and numerical simulation,with the change of fracture parameters,the variation trend of elastic modulus dispersion is basically the same,but the attenuation value and characteristic frequency are different. |
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