Simulation and analysis of lithology heterogeneity on CO 2 geological sequestration in deep saline aquifer: a case study of the Ordos Basin

摘要: A simplified two-dimensional axisymmetric model was established based on a typical continental sedimentary basin in China to simulate the thermal evolution of wellbore and reservoir during injection CO2 by taking consideration lithology heterogeneity reservoir. By comparing with two simple one-dimensional theory models, influence mass flow rate distribution along depth is identified. Results suggested that interaction multiple layers heterogeneous will so as impact corresponding temperature pressure Layer burial (or relative location), porosity, permeability thickness are all important factors affect wellbore. The variation change flowing into each through heat extraction from rocks, compressibility potential energy loss, varying hydrostatic drop due friction determine pressure. depth, This study may help deepen our understanding actual provide knowledge supplement for liquid (especially CO2) underground, such deep saline aquifer, depleted oil/gas coal bed.