摘要
基于对页岩气开采放射性影响的关注,对四川盆地龙马溪组页岩气开采废水天然放射性水平进行调查研究。采集样品9个,监测其总α、总β和γ核素等天然放射水平,并与《污水综合排放标准》及四川省天然放射性水平进行对比分析。结果显示,四川盆地龙马溪组页岩气开采所使用的钻井液和压裂液等未导致龙马溪组地层高铀中的^(238)U大量溶出,地层钾盐含量较高和钾盐的高溶解性导致出现^(40)K呈现偏高的趋势,压裂返排液外排可能造成受纳水体天然放射性核素^(238)U、^(232)Th、^(40)K浓度明显增加。
Based on the interest in the radioactivity effect of shale gas exploitation, the natural radioactivity level of wastewater from shale gas exploitation in Longmaxi Formation of Sichuan Basin was investigated. Nine samples were collected to monitor the levels of natural radioactivity such as total alpha, total beta and gamma nuclides. The results were compared with "Comprehensive Wastewater Discharge Standard" and the natural radioactivity level of Sichuan Province. The results showed that drilling fluid and fracturing fluid used in shale gas exploitation of Longmaxi Formation in Sichuan Basin have not resulted in a large amount of 238 U dissolution in high uranium of Longmaxi Formation. The high content of potassium salt in formation and high solubility of potassium salt resulted in a high trend of 40 K. The discharge of fracturing back-flow fluid may result in a significant increase in natural radionuclides 238 U, 232 Th and 40 K concentrations in the receiving water body.
作者
王红磊
饶维
罗茂丹
余强
WANG Hong-lei;RAO Wei;LUO Mao-dan;YU Qiang(Sichuan Environment & Engineering Appraisal Center,Chengdu 610041,China;Sichuan Provicial Central Managing & Monitoring Station for Radiation & Environment,Chengdu 611139,China)
出处
《四川环境》
2019年第2期86-89,共4页
Sichuan Environment
关键词
页岩气
天然放射性
Shale gas
natural radioactivity
