A Pore-Network Simulation Model of Dynamic CO2 Migration in Organic-Rich Shale Formations

Pengwei Zhang, Michael A. Celia, Karl W. Bandilla, Liming Hu, Jay N. Meegoda

Research output: Contribution to journalArticle

Abstract

One attractive aspect of CO2 sequestration in shale formations is the preferential adsorption of CO2 compared to methane, which may provide enhanced methane production as well as sequestration of carbon dioxide. In this work, a comprehensive theoretical model of CO2 migration at the pore scale is developed to study CO2 migration properties in organic-rich shale formations. The proposed model takes into account dynamic competitive adsorption between CO2 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 CO2 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 CO2 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.

Original languageEnglish (US)
Pages (from-to)479-496
Number of pages18
JournalTransport in Porous Media
Volume133
Issue number3
DOIs
StatePublished - Jul 1 2020

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemical Engineering(all)

Keywords

  • CO sequestration
  • Competitive adsorption
  • Multi-component flow
  • Pore-network model
  • Shale gas

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