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首页> 外文期刊>Environmental Science & Technology >Hydrogeochemical and Isotopic Indicators of Hydraulic Fracturing Flowback Fluids in Shallow Groundwater and Stream Water, derived from Dameigou Shale Gas Extraction in the Northern Qaidam Basin
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Hydrogeochemical and Isotopic Indicators of Hydraulic Fracturing Flowback Fluids in Shallow Groundwater and Stream Water, derived from Dameigou Shale Gas Extraction in the Northern Qaidam Basin

机译：柴达木盆地北部大梅沟页岩气提取浅层地下水和溪流水力压裂返排液的水文地球化学和同位素指标

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摘要

Most of the shale gas production in northwest China is from continental shale. Identifying hydrogeochemical and isotopic indicators of toxic hydraulic fracturing flowback fluids (HFFF) has great significance in assessing the safety of drinking water from shallow groundwater and streamwater. Hydrogeochemical and isotopic data for HFFF from the Dameigou shale formations (Cl/Br ratio (1.81 × 10~(-4)-6.52 ×10~(-4)), Ba/Sr (>0.2), δ~(11)B (-10-l‰), and ε_(Sr)~(SW), (56-65, where ε_Sr~(SW), is the deviation of the ~(87)Sr/~(86)Sr ratio from that of seawater in parts per 10~4)) were distinct from data for the background saline shallow groundwater and streamwater before fracturing. Mixing models indicated that inorganic elemental signatures (Br/Cl, Ba/Sr) and isotopic fingerprints (δ~(11)B, ε_(Sr)~(SW) can be used to distinguish between HFFF and conventional oil-field brine in shallow groundwater and streamwater. These diagnostic indicators were applied to identify potential releases of HFFF into shallow groundwater and streamwater during fracturing, flowback and storage. The monitored time series data for shallow groundwater and streamwater exhibit no clear trends along mixing curves toward the HFFF end member, indicating that there is no detectable release occurring at present.
机译：中国西北地区的大多数页岩气生产都来自大陆页岩。识别有毒水力压裂返排液（HFFF）的水文地球化学和同位素指标对评估浅层地下水和溪流饮用水的安全性具有重要意义。大梅沟页岩组HFFF的水文地球化学和同位素数据（Cl / Br比（1.81×10〜（-4）-6.52×10〜（-4）），Ba / Sr（> 0.2），δ〜（11）B （-10-l‰）和ε_（Sr）〜（SW），（56-65，其中ε_Sr〜（SW）是〜（87）Sr /〜（86）Sr比与每10〜4））中的海水含量与压裂之前的背景盐碱浅层地下水和溪流数据不同。混合模型表明，无机元素特征（Br / Cl，Ba / Sr）和同位素指纹特征（δ〜（11）B，ε_（Sr）〜（SW）可用于区分浅层HFFF和常规油田盐水。这些诊断指标用于识别压裂，返排和存储过程中HFFF向浅层地下水和流水中的潜在释放。监测的浅层地下水和流水的时间序列数据在朝向HFFF端部的混合曲线上没有明确的趋势，表示目前没有可检测的释放发生。

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  • 来源
    《Environmental Science & Technology》 |2017年第11期|5889-5898|共10页
  • 作者

    Zhaoxian Zheng; Hongda Zhang; Zongyu Chen; Xufeng Li; Pucheng Zhu; Xiaoshun Cui;

  • 作者单位

    Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, 050061, Hebei P.R.China,China University of Geosciences (Beijing), Beijing, 100083, P.R. China;

    Oil & Gas Survey, China Geology Survey, Beijing, 100029, P.R. China;

    Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, 050061, Hebei P.R.China;

    Center for Hydrogeology and Environmental Geology, China Geological Suvery, Baoding Hebei 071051, P.R. China;

    Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, 050061, Hebei P.R.China;

    Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, 050061, Hebei P.R.China;

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