Sensitivity assessment of strontium isotope as indicator of polluted groundwater for hydraulic fracturing flowback fluids produced in the Dameigou Shale of Qaidam Basin

Zhao-xian Zheng; Xiao-shun Cui; Pu-cheng Zhu; Si-jia Guo

doi:10.19637/j.cnki.2305-7068.2021.02.001

Volume 9 Issue 2

Jun. 2021

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Article Navigation > Journal of Groundwater Science and Engineering > 2021 > 9(2): 93-101

Zhao-xian Zheng, Xiao-shun Cui, Pu-cheng Zhu, et al. 2021: Sensitivity assessment of strontium isotope as indicator of polluted groundwater for hydraulic fracturing flowback fluids produced in the Dameigou Shale of Qaidam Basin. Journal of Groundwater Science and Engineering, 9(2): 93-101. doi: 10.19637/j.cnki.2305-7068.2021.02.001

Citation:

Zhao-xian Zheng, Xiao-shun Cui, Pu-cheng Zhu, et al. 2021: Sensitivity assessment of strontium isotope as indicator of polluted groundwater for hydraulic fracturing flowback fluids produced in the Dameigou Shale of Qaidam Basin. Journal of Groundwater Science and Engineering, 9(2): 93-101. doi: 10.19637/j.cnki.2305-7068.2021.02.001

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Sensitivity assessment of strontium isotope as indicator of polluted groundwater for hydraulic fracturing flowback fluids produced in the Dameigou Shale of Qaidam Basin

doi: 10.19637/j.cnki.2305-7068.2021.02.001

Zhao-xian Zheng^{1, 2},
Xiao-shun Cui^{1, 2
,
,},
Pu-cheng Zhu^{1, 2},
Si-jia Guo^{1, 2}

1.
Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China
2.
Key Laboratory of Groundwater Science and Engineering, Ministry of Natural Resources, Shijiazhuang 050061, China

More Information

Corresponding author: cxsh109@126.com
Received Date: 2020-12-07
Accepted Date: 2021-03-30

Available Online: 2021-08-18

Publish Date: 2021-06-28

Abstract

Abstract

Hydrogeochemical processes that would occur in polluted groundwater and aquifer system, may reduce the sensitivity of Sr isotope being the indicator of hydraulic fracturing flowback fluids (HFFF) in groundwater. In this paper, the Dameigou shale gas field in the northern Qaidam Basin was taken as the study area, where the hydrogeochemical processes affecting Sr isotope was analysed. Then, the model for Sr isotope in HFFF-polluted groundwater was constructed to assess the sensitivity of Sr isotope as HFFF indicator. The results show that the dissolution can release little Sr to polluted groundwater and cannot affect the ε_Sr (the deviation of the ⁸⁷Sr/⁸⁶Sr ratio) of polluted groundwater. In the meantime, cation exchange can considerably affect Sr composition in the polluted groundwater. The Sr with low ε_Sr is constantly released to groundwater from the solid phase of aquifer media by cation exchange with pollution of Quaternary groundwater by the HFFF and it accounts for 4.6% and 11.0% of Sr in polluted groundwater when the HFFF flux reaches 10% and 30% of the polluted groundwater, respectively. However, the Sr from cation exchange has limited impact on Sr isotope in polluted groundwater. Addition of Sr from cation exchange would only cause a 0.2% and 1.2% decrease in ε_Sr of the polluted groundwater when the HFFF flux reaches 10% and 30% of the polluted groundwater, respectively. These results demonstrate that hydrogeochemical processes have little effect on the sensitivity of Sr isotope being the HFFF indicator in groundwater of the study area. For the scenario of groundwater pollution by HFFF, when the HFFF accounts for 5% (in volume percentage) of the polluted groundwater, the HFFF can result in detectable shifts of ε_Sr (Δε_Sr=0.86) in natural groundwater. Therefore, after consideration of hydrogeochemical processes occurred in aquifer with input of the HFFF, Sr isotope is still a sensitive indicator of the Quaternary groundwater pollution by the HFFF produced in the Dameigou shale of Qaidam Basin.
- Dameigou shale gas,
- Groundwater pollution,
- Hydraulic fracturing flowback fluids,
- Strontium isotope,
- Hydrogeochemical modelling

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References(22)

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