摘要
现阶段对黏土矿物表面水化的抑制仍然存在技术瓶颈,亟须建立抑制黏土矿物表面水化的新理论和新方法。针对泥页岩中常见的伊利石黏土矿物样品,通过等温吸附法研究其表面水化程度,通过采用X射线衍射分析法、热重分析法和低场核磁共振分析法研究钠蒙脱石的结合水类型及含量,建立了伊利石结合水的定量评价方法。结果表明:随着相对湿度的增加,伊利石的基底间距有变化(变化较小)。当相对湿度为1.00时,伊利石可达到二层水化;热重分析可定量区分出伊利石的结合水和自由水。低场核磁共振分析能定量区分伊利石的结合水和自由水。此举可为建立抑制黏土矿物表面水化定量评价方法提供理论和实验支撑。
At the present stage, there are still technical bottlenecks in the suppression of surface hydration of clay minerals, and there is an urgent need to establish new theories and methods to suppress surface hydration of clay minerals. In this paper, for the common illite clay mineral samples in mud shale, the degree of surface hydration was studied by isothermal adsorption method, and the type and content of bound water of sodium montmorillonite were investigated by using X-ray diffraction analysis, thermogravimetric analysis and low-field NMR analysis, and the quantitative evaluation method of bound water of illite was established. The experimental results showed that the basal spacing of illite changed with the increase of relative humidity(the change was small). When the relative humidity was 1.00, illite reached diagenetic hydration;thermogravimetric analysis could quantitatively distinguish the bound water and free water of illite. Low-field NMR analysis could quantitatively distinguish between bound and free water of illite. This can provide theoretical and experimental support for the establishment of a quantitative evaluation method for inhibiting surface hydration of clay minerals.
作者
张永飞
李育
王永东
叶政钦
李卫东
邹立萍
张敏
康少飞
ZHANG Yong-fei;LI Yu;WANG Yong-dong;YE Zheng-qin;LI Wei-dong;ZOU Li-ping;ZHANG Min;KANG Shao-fei(Research Institute of Yanchang Oilfield Co.,Ltd.,Xi'an Shaanxi 710065,China;Yanchang Oilfield Co.,Ltd.,Yan'an Shaanxi 716099,China;China University of Petroleum(East China),Qingdao Shandong 266580,China)
出处
《当代化工》
CAS
2023年第1期141-144,共4页
Contemporary Chemical Industry
基金
国家科技重大专项,大型油气田及煤层气开发(项目编号:2018ZX07002-002)。
关键词
页岩
黏土矿物
伊利石
表面水化
水化程度
热重分析
Shale
Clay minerals
Illite
Surface hydration
Degree of hydration
Thermogravimetric analysis
