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A Pore-Network Simulation Model of Dynamic CO_2 Migration in Organic-Rich Shale Formations

机译：有机富含页岩形成中动态CO_2迁移的孔网络仿真模型

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摘要

One attractive aspect of CO(2)sequestration in shale formations is the preferential adsorption of CO(2)compared to methane, which may provide enhanced methane production as well as sequestration of carbon dioxide. In this work, a comprehensive theoretical model of CO(2)migration at the pore scale is developed to study CO(2)migration properties in organic-rich shale formations. The proposed model takes into account dynamic competitive adsorption between CO(2)and CH4, slip-flow effects due to the nanometer range of pore sizes, and pore-size changes due to adsorption. Because of the high pressure and temperature, the injected CO(2)is in supercritical phase. Pore bodies in the shale matrix are irregular in shape, with roughness along pore wall. The structure of pore body affects the amount of surface areas and associated number of adsorption sites, and hence, a shape factor is proposed in this work to consider the irregularity of pore structure in shale matrix. The sorption of CO(2)leads to an apparent retardation of the migration of CO2, which is quantified in this work. The developed pore-network model is extended to consider the impacts of different spatial distributions of the organic materials within the shale matrix.
机译：岩石形成中的CO（2）螯合的一个有吸引力的方面是与甲烷相比的CO（2）的优先吸附，其可提供增强的甲烷生产以及二氧化碳的封存。在这项工作中，开发了一种孔隙率迁移的综合理论模型，以研究有机富含物质形成的CO（2）迁移性质。所提出的模型考虑了CO（2）和CH4之间的动态竞争吸附，由于孔径的纳米范围，并且由于吸附而改变孔径变化。由于高压和温度，注射的CO（2）处于超临界阶段。页岩基质中的孔体以不规则的形状，沿孔壁粗糙。孔体的结构影响表面积和相关数量的吸附位点，因此提出了这种作品中的形状因子，以考虑页岩基质中孔隙结构的不规则性。 CO（2）的吸附导致CO2迁移的表观延迟，这在这项工作中量化。开发的孔网模型扩展以考虑不同空间分布在页岩基质内的不同空间分布的影响。

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