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A New Analysis Model for Potential Contamination of a Shallow Aquifer from a Hydraulically-Fractured Shale

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  • Weihong Peng

    (School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China
    State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Menglin Du

    (School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Feng Gao

    (School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China
    State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Xuan Dong

    (School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Hongmei Cheng

    (School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China
    State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

Hydraulic fracturing (HF) is widely used in shale gas development, which may cause some heavy metals release from shale formations. These contaminants could transport from the fractured shale reservoirs to shallow aquifers. Thus, it is necessary to assess the impact of pollution in shallow aquifers. In this paper, a new analysis model, considering geological distributions, discrete natural fractures (NFs) and faults, is developed to analyze the migration mechanism of contaminants. Furthermore, the alkali erosion of rock caused by high-pH drilling of fluids, is considered in this paper. The numerical results suggest that both NFs and alkali erosion could reduce the time required for contaminants migrating to aquifers. When NFs and alkali erosion are both considered, the migration time will be shortened by 51 years. Alkali erosion makes the impact of NFs, on the contaminant migration, more significant. The migration time decreases with increasing pH values, while the accumulation is on the opposite side. Compared with pH 12.0, the migration time would be increased by 45 years and 29 years for pH 11.0 and 11.5, respectively. However, the migration time for pH 12.5 and 13.0 were found to be decreased by 82 years and 180 years, respectively. Alkali erosion could increase the rock permeability, and the elevated permeability would further enhance the migration velocity of the contaminants, which might play a major role in assessing the potential contamination of shallow aquifers.

Suggested Citation

  • Weihong Peng & Menglin Du & Feng Gao & Xuan Dong & Hongmei Cheng, 2018. "A New Analysis Model for Potential Contamination of a Shallow Aquifer from a Hydraulically-Fractured Shale," Energies, MDPI, vol. 11(11), pages 1-22, November.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:11:p:3010-:d:179986
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    References listed on IDEAS

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    1. F. Fusseis & K. Regenauer-Lieb & J. Liu & R. M. Hough & F. De Carlo, 2009. "Creep cavitation can establish a dynamic granular fluid pump in ductile shear zones," Nature, Nature, vol. 459(7249), pages 974-977, June.
    2. Robert W. Gilmer & Emily Kerr, 2010. "Natural gas from shale: Texas revolution goes global," Southwest Economy, Federal Reserve Bank of Dallas, issue Q3, pages 10-13.
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