黏土矿物对页岩吸附气量的影响——基于川东南丁山地区龙马溪组页岩样品的实验分析
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摘要
黏土矿物是页岩的重要矿物组成之一,对页岩微观孔隙的发育具有重要影响。黏土矿物的发育类型及矿物组分有差异,对页岩吸附能力的影响也有所不同。为明确不同黏土矿物及组合特征对页岩吸附气的影响,选取川东南丁山地区龙马溪组富有机质页岩全岩样品及伊利石、高岭石、绿泥石等单矿物样品进行吸附实验。结果显示:单黏土矿物及页岩样品吸附曲线均出现明显的吸附滞后现象,吸附-脱吸附曲线为典型的IV型吸附曲线,表明黏土矿物微观孔隙结构类型主要为"墨水瓶状"及平板线型狭孔。根据不同黏土矿物及含量吸附曲线分析,黏土矿物吸附能力由强到弱依次为蒙脱石、伊蒙混层、伊利石、高岭石。页岩含水率会严重影响黏土矿物的气体吸附能力:当页岩含水率小于58%时,随着含水率的增加,黏土矿物的吸附气量逐渐减少;含水率超过58%以后,随着样品含水率的进一步增加,吸附气量的变化甚微。
The clay minerals are one of the main constituent minerals of the shale, which has an important influence on the development of shale micropores. There are also differences in the influence of clay mineral development types and mineral composition on shale adsorption capacity. In order to clarify the influence of different clay minerals and combination characteristics on shale adsorption gas, single clay minerals such as illite, kaolinite and chlorite, and shale samples of Longmaxi Formation in Dingshan area of southeast Sichuan are selected for shale gas adsorption experiment. The results show that the adsorption hysteresis phenomenon is observed in single clay minerals and shale samples. The adsorption-desorption curve is a typical type IV adsorption curve, indicating that the microscopic pore structure types of clay are mainly "ink bottle-shaped" and flat-line narrow holes. According to the analysis of adsorption curves of different clay minerals and their contents, the adsorption capacity of clay minerals from strong to weak is montmorillonite, illite and kaolinite in turn. The water content of shale seriously affects the adsorption ability of clay minerals to gas. The experimental results show that when the water content is less than 58%, with the increase of water content, the adsorption gas volume also decreases. When the moisture content is over 58%, the adsorption gas volume changes little with the increase of water content.
The clay minerals are one of the main constituent minerals of the shale, which has an important influence on the development of shale micropores. There are also differences in the influence of clay mineral development types and mineral composition on shale adsorption capacity. In order to clarify the influence of different clay minerals and combination characteristics on shale adsorption gas, single clay minerals such as illite, kaolinite and chlorite, and shale samples of Longmaxi Formation in Dingshan area of southeast Sichuan are selected for shale gas adsorption experiment. The results show that the adsorption hysteresis phenomenon is observed in single clay minerals and shale samples. The adsorption-desorption curve is a typical type IV adsorption curve, indicating that the microscopic pore structure types of clay are mainly "ink bottle-shaped" and flat-line narrow holes. According to the analysis of adsorption curves of different clay minerals and their contents, the adsorption capacity of clay minerals from strong to weak is montmorillonite, illite and kaolinite in turn. The water content of shale seriously affects the adsorption ability of clay minerals to gas. The experimental results show that when the water content is less than 58%, with the increase of water content, the adsorption gas volume also decreases. When the moisture content is over 58%, the adsorption gas volume changes little with the increase of water content.
引文
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[2] 周洵,杨璠,易婷,等.页岩吸附能力与温度的关系及吸附模型比较[J].重庆科技学院学报(自然科学版),2019,21(1):9-11.
[3] ROSS D J K,BUSTIN R M.The Importance of Shale Composition and Pore Structure Upon Gstorage Potential of Shale Gas Reservoirs[J].Marine and Petroleum Geology,2009,26(6):916-927.
[4] ROSS D J K,BUSTIN R M.Shale Gas Potential of the Lower Jurassic Gordondale Memher,Northeastern British Columbia,Canada[J].Bulletin of Canadian Petroleum Geology,2007,55(1):51-75.
[5] MAVO R M.Barnett Shale Gas in Place Volume Including Sorbed and Free Gas Volume(abs)[C].Fort Worth,Texas:AAPG Southwest Section Meeting,2003.
[6] KUILA U,PRASAD M.Specific Surface Area and Pore‐Size Distribution in Clays and Shales[J].Geophysical Prospecting,2013,61(2):341-362.
[7] GROEN J C,PEFFER L A A,PEREZ-RAMIREZ J.Pore Size Determination in Modified Micro-and Mesoporous Materials.Pitfalls and Limitations in Gas Desorption Data Analysis[J].Microporous and Mesoporous Materials,2003,60(1):1-17.
[8] 冯东,李相方,李靖,等.黏土矿物吸附水蒸气特征及对孔隙分布的影响[J].中国石油大学学报(自然科学版),2018,42(2):110-118.
[9] 贺晓飞,鲁家国,叶链,等.含水页岩吸附甲烷实验研究进展[J].中国石油和化工标准与质量,2017,37(2):29-30.
[10] 贺晓飞,何梓豪,叶链,等.含水页岩吸附甲烷实验研究综述[J].中国石油石化,2016(23):102-103.
[11] 李靖,李相方,王香增,等.页岩黏土孔隙含水饱和度分布及其对甲烷吸附的影响[J].力学学报,2016,48(5):1217-1228.
[12] 侯宇光,何生,易积正,等.页岩孔隙结构对甲烷吸附能力的影响[J].石油勘探与开发,2014,41(2):248-256.
[13] 吉利明,邱军利,宋之光,等.黏土岩孔隙内表面积对甲烷吸附能力的影响[J].地球化学,2014,43(3):238-244.
[14] 李全中,蔡永乐,胡海洋.泥页岩中黏土矿物纳米孔隙结构特征及其对甲烷吸附的影响[J].煤炭学报,2017,42(9):2414-2419.
[15] 王燕,冯明刚,赵军,等.页岩气储层吸附气特征、影响因素及定量评价[C]//2015年全国天然气学术年会论文集,2015.