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A multi-continuum model for simulating in-situ conversion process in low-medium maturity shale oil reservoir

: In-situ conversion is proposed applicable for low-medium maturity shale oil reservoir. However, parallel chemical kinetic reactions and evolution of shale pores during in-situ conversion make the numerical simulation a challenging problem. Although shale is typical multiscale and heterogeneous media, few models in previous studies take the difference between organic and inorganic system into consideration, which cannot simulate ﬂuid ﬂow accurately. In this paper, a multi-continuum model, considering coupled thermal-reactive compositional ﬂow, is developed to simulate in-situ conversion process in low- medium maturity shale oil reservoir. The reaction of kerogen and hydrocarbon is quantiﬁed using kinetic reaction model. The evolution of ﬂuid composition and shale properties are also incorporated. The accuracy of multiple-interacting-continua model and compositional model are demonstrated by comparing with commercial software and analytical solution. Then, the typical hexagon vertical well heating pattern is simulated and the feasibility is evaluated from an economic aspect. Finally, a series of case studies are conducted to investigate the impact of operation parameters on shale oil production.