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中国西南地区页岩气田水基钻屑理化性状与污染物分析
高昊辰,张 春,张思兰,刘广明,周泽军,陈科平,何 勇,陈金林
1.中国科学院南京土壤研究所;2.重庆市涪陵页岩气环保研发与技术服务中心;3.南京林业大学
摘要:
从重庆市涪陵页岩气田采集水基钻屑样品,对其理化性质与主要可能污染物共24项指标进行检测分析,结果表明:水基钻屑具有碱性强、盐分高的特征;速效钾含量较高(805 ~ 7 650 mg/kg),有效磷和碱解氮含量较低;可吸附有机卤化物(AOX)、矿物油、苯并[a]芘、粪大肠菌群值这4项主要有机污染物指标均符合GB/T23486—2009《城镇污水处理厂污泥处置园林绿化用泥质》要求;重金属含量均满足CJ/T 340—2016《绿化种植土壤》中的I级或II级标准,满足道路绿化带、工厂附属绿地土壤对重金属含量的控制要求。Hakanson潜在生态风险指数法定量评估揭示,该页岩气田水基钻屑中重金属存在“轻度”潜在生态风险,其中Hg和Cd为主要贡献因子。因此,该页岩气田水基钻屑存在绿地土壤化利用的可能。
关键词:  水基钻屑  页岩气田  重金属  有机污染物
DOI:10.13758/j.cnki.tr.2019.06.017
分类号:X741;S15
基金项目:重庆市科委-社会事业与民生保障科技创新专项重点研发项目(cstc2017shms-zdyfx0033)、江苏省水利科技项目(2017011-3)和江苏省重点研发项目(BE2017389, BE2018759)资助。
Analysis of Physiochemical Properties and Pollutants of Water-Based Drilling Cuttings in Shale Gas Field near Southwest China
Gao Haochen1, Zhang Chun2,3, ZHANG Silan2,3, LIU Guangming1, CHEN Jinlin4, HE Min5,3, WANG Chaoqiang5,3, MEI Xudong5,3
1.Institute of Soil Science, Chinese Academy of Sciences;2.Chongqing Environmental Protection Center for Shale Gas Technology &3.Development;4.Nanjing Forestry University;5.Chongqing Environmental Protection Center for Shale Gas Technology DdDdamp
Abstract:
The samples of water-based drilling cuttings were collected from shale gas fields of Fuling in Chonging, and their physiochemical properties and the main possible pollutants (24 items) were tested and analyzed. Results indicated that water-based drilling cuttings had the features of strong alkalinity and highly salinity; the content of potassium was relatively high (805-7 650 mg/kg), and the contents of phosphorus and nitrogen were relatively low; absorbable organic haloid, mineral oil, benzo-a-pyrene and fecal coliforms all met the requirements of Mud Used in Landscape of Urban Sewage Treatment Factory GB/T23486—2009; the contents of heavy metals all met the requirements of Green Planting Soil CJ/T 340—2016 Level I or Level II, and they met the control requirements of heavy metal contents for green belts on street and soil in the factory. Hakanson potential ecological risk index revealed that there was a “mild” potential ecological risk of heavy metals in water-based drilling cuttings in shale gas fields near Southwest China. Hg and Cd were the main contributors. Water-based drilling cuttings in shale gas fields of Fuling in Chongqing have the potential to be used for soil utilization in the green area.
Key words:  Water-based drill cuttings  Shale gas fields  Heavy metals  Organic pollutants

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