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Simulation and analysis of lithology heterogeneity on CO2 geological sequestration in deep saline aquifer: a case study of the Ordos Basin

Abstract

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

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Acknowledgments

The support from the Research Fund for the Doctoral Program of Higher Education (No. 20120145110005) is acknowledged. Also, this work was also partially supported by the National Natural Science Foundation of China (NSFC, No. 41572233) and the special Scientific Research Fund of Public Welfare Profession of the Ministry of Land and Resources of China (No. 201211063-3-2).

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Correspondence to Yilian Li.

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Liu, D., Li, Y., Song, S. et al. Simulation and analysis of lithology heterogeneity on CO2 geological sequestration in deep saline aquifer: a case study of the Ordos Basin. Environ Earth Sci 75, 962 (2016). https://doi.org/10.1007/s12665-016-5754-7

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  • DOI: https://doi.org/10.1007/s12665-016-5754-7

Keywords

  • CO2 sequestration
  • Lithology heterogeneity
  • Temperature
  • Pressure
  • Combined wellbore–reservoir system