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首页> 外文期刊>The Science of the Total Environment >Hydrochemistry of flowback water from Changning shale gas field and associated shallow groundwater in Southern Sichuan Basin, China: Implications for the possible impact of shale gas development on groundwater quality
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Hydrochemistry of flowback water from Changning shale gas field and associated shallow groundwater in Southern Sichuan Basin, China: Implications for the possible impact of shale gas development on groundwater quality

机译：四川盆地南部长宁页岩气田返排水及相关浅层地下水的水化学：对页岩气开发对地下水质量可能产生影响的启示

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摘要

The worldwide expansion of shale gas production and increased use of hydraulic fracturing have raised public concerns about safety and risks of groundwater resources in shale gas extraction areas. China has the largest shale gas resources in the world, most of which are located in the Sichuan Basin. Shale gas extraction in the Sichuan Basin has been increasing rapidly in recent years. However, the potential impact on shallow groundwater quality has not yet been systematically investigated. In order to evaluate the possible impact of shale gas extraction on groundwater quality, we present, for the first time, the hydrochemistry and Sr isotopic data of shallow groundwater, as well as flowback and produced water (FP water) in the Changning shale gas field in Sichuan Basin, one of the major shale gas fields in China. The Changning FP water is characterized by high salinity (TDS of 13,100-53,500 mg/L), Br/CI (2.76 × 10~(-3)) and ~(87)Sr/~(85)Sr (0.71849), which are distinguished from the produced waters from nearby conventional gas fields with higher Br/CI (4.5 × 10~(-3)) and lower ~(87)Sr/~(86)Sr (0.70830-0.71235). The shallow groundwater samples were collected from a Triassic karst aquifer in both active and nonactive shale gas extraction areas. They are dominated by low salinity (TDS of 145-1100 mg/L), Ca-HCO_3 and Ca-Mg-HCO_3 types water, which are common in carbonate karst aquifers. No statistical difference of the groundwater quality was observed between samples collected in active versus nonactive shale gas extraction areas. Out of 66 analyzed groundwater, three groundwater samples showed relatively higher salinity above the background level, with low ~(87)Sr/~(86)Sr (0.70824-0.7110) and Br/Cl (0.5-1.8 × 10~(-3)) ratios relatively to FP water, excluding the possibility of contamination from FP water. None of the groundwater samples had detected volatile organic compounds (VOCs). The integration of geochemical and statistical analysis shows no direct evidence of groundwater contamination caused by shale gas development.
机译：页岩气生产的全球扩张和水力压裂技术的广泛使用引起了公众对页岩气开采区地下水资源安全和风险的担忧。中国拥有世界上最大的页岩气资源，其中大部分位于四川盆地。近年来，四川盆地页岩气的开采一直在迅速增长。然而，对浅层地下水水质的潜在影响尚未得到系统的研究。为了评估页岩气提取对地下水质量的可能影响，我们首次提供了长宁页岩气田的浅层地下水的水化学和Sr同位素数据以及回流和采出水（FP水）四川盆地是中国主要的页岩气田之一。长宁FP水的特征是高盐度（TDS为13,100-53,500 mg / L），Br / Cl（2.76×10〜（-3））和〜（87）Sr /〜（85）Sr（0.71849），与附近传统气田的产出水区分开，其较高的Br / Cl（4.5×10〜（-3））和较低的〜（87）Sr /〜（86）Sr（0.70830-0.71235）。在活动和非活动页岩气开采区均从三叠系喀斯特含水层收集了浅层地下水样品。它们以低盐度（TDS为145-1100 mg / L），Ca-HCO_3和Ca-Mg-HCO_3型水（在碳酸盐岩溶地层中很常见）为主。在活动页岩气开采区和非活动页岩气开采区采集的样品之间，没有观察到地下水质量的统计差异。在分析的66个地下水中，三个地下水样品的盐度高于背景水平，〜（87）Sr /〜（86）Sr（0.70824-0.7110）和Br / Cl（0.5-1.8×10〜（-3）低））与FP水的相对比率，不包括FP水污染的可能性。地下水样品均未检测到挥发性有机化合物（VOC）。地球化学和统计分析的结合没有显示出页岩气开发引起的地下水污染的直接证据。

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