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作 者:唐晓梦 林奇云 林国庆[1,2] 孙静 初慧[1,2] 苏胜 张丽春 TANG Xiaomeng;LIN Qiyun;LIN Guoqing;SUN Jing;CHU Hui;SU Sheng;ZHANG Lichun(Key Laboratory of the Ministry of Marine Environment and Ecological Education,Ocean University of China,Shandong Qingdao 266100,China;Key Laboratory of Marine Environmental and Geological Engineering,Shandong Qingdao 266100,China;Yantai Planning and Designing Institute,Shandong Yantai 264000,China)
机构地区:[1]中国海洋大学海洋环境与生态教育部重点实验室,山东青岛266100 [2]山东省海洋环境地质工程重点实验室,山东青岛266100 [3]烟台市规划设计研究院有限公司,山东烟台264000
出 处:《山东国土资源》2020年第8期48-53,共6页Shandong Land and Resources
基 金:国家基金委山东省联合基金项目(编号U1806210)。
摘 要:滨海含水层地层损害是指淡水驱替咸水过程中,释放后的黏土胶体发生絮凝沉降,导致地层孔隙被堵塞,引起含水介质的渗透性降低的现象。该文通过絮凝沉降实验和定流速砂柱实验,分析不同离子强度和阳离子价态(一价、二价)对胶体絮凝沉降的影响,结果表明:NaCl作为电解质时,絮凝发生的离子强度范围在0.032~0.034 mol/L之间,絮凝时间从82 min减少至39 min;而电解质为CaCl 2,离子强度为0.006 mol/L时,胶体的絮凝时间仅需6 min;钙钠比越高,黏粒絮凝发生的越快。砂柱实验结果显示,含水介质渗透性会随着电解质溶液的离子强度增加和阳离子价态的升高快速降低。当电解质为NaCl,离子强度分别为0.054 mol/L和0.017 mol/L时,含水介质渗透性降低20%所需时间分别为15 min和50 min;当电解质为CaCl2,离子强度为0.011 mol/L时,含水介质渗透性降低20%仅需5 min。因为高离子强度和高价阳离子可以加速胶体絮凝,多孔介质的孔吼更容易发生堵塞,研究成果对降低滨海含水层的地层损害有一定的实际应用价值。Formation damage of coastal aquifer refers to the flocculation and deposition of clay colloid during the displacement of salt water and fresh water.It has caused the pores blocked,and decreased the permeability of the aqueous medium.By using the flocculation experiments and sand-columns experiments,the effects of ionic strength and cation valence on colloidal flocculation and deposition under different water chemical conditions have been studied.It is showed that when NaCl is regarded as the electrolyte,flocculation time drops quickly,and reduce from 82min to 39min,and the range of ionic strength is 0.032~0.034 mol/L;when CaCl 2 is regarded as electrolyte,the ionic strength is 0.006 mol/L,the flocculation time only takes 6 minutes;the higher the calcium to sodium ratio,the faster the flocculation occurs.Sand columns experiments showed that the permeability of the medium will decrease when the ionic strength and the valence of the cation increases.When the ionic strength of NaCl electrolyte is 0.054 mol/L and 0.017 mol/L,the time for the permeability reduction by 20%is 15min and 50min respectively.For the same condition,when the ionic strength of CaCl2 electrolyte is 0.011 mol/L,it takes only 5 minutes.The reason is that high ionic strength and valence cations can accelerate colloidal flocculation which cause the pores blocked.The results have potential practical application for reducing the formation damage of coastal aquifer.
关 键 词:滨海含水层 渗透性 黏土胶粒 离子强度 阳离子价态
分 类 号:P641.3[天文地球—地质矿产勘探]
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