黔北地区海陆交互相龙潭组泥页岩孔隙分形特征

发布时间：2018-03-31 04:11

本文选题：黔北地区　切入点：泥页岩　出处：《科学技术与工程》2017年29期

【摘要】：基于分形理论和方法,以钻井岩心泥页岩样品低温液氮吸附试验数据为基础,分析黔北龙潭组泥页岩样品的孔隙分形特征,运用分析FHH模型计算了吸附孔分维值D,并探讨了分形维数与孔隙结构、有机碳含量(TOC)、岩矿物等之间的关系。研究表明:样品孔隙以中孔为主,孔径主要分布在20 nm以下;分维值介于2.683~2.912之间,吸附孔分形特征明显,反映了泥页岩孔隙结构复杂和非均质性强的特征;分维值与BET比表面积、平均孔直径、BJH中值半径呈较好的相关性,与最大吸附量、有机碳含量和石英亦有较好的相关性,而与黏土矿物相关性不明显。
[Abstract]:Based on fractal theory and method, the pore fractal characteristics of shale samples of Longtan formation in northern Guizhou were analyzed based on the low temperature liquid nitrogen adsorption test data of mud shale samples from drilling cores. The fractal dimension of adsorption pore D was calculated by FHH model, and the relationship between fractal dimension and pore structure, organic carbon content, rock mineral and so on was discussed. The results show that the pore size of the sample is mainly mesoporous and the pore size is below 20 nm. The fractal dimension is between 2.683 and 2.912, the fractal characteristic of adsorption pore is obvious, which reflects the characteristics of complex pore structure and strong heterogeneity of shale pore structure, the fractal dimension value has a good correlation with the specific surface area of BET, the mean pore diameter and the median radius of BJH, and has a good correlation with the maximum adsorption capacity. There was also a good correlation between organic carbon content and quartz, but not with clay minerals.
【作者单位】：贵州省煤层气页岩气工程技术研究中心;贵州省煤田地质局水源队;贵州煤矿地质工程咨询与地质环境监测中心;中国矿业大学资源与地球科学学院;
【基金】：国家科技重大专项(2016ZX05034004-007) 贵州省地质勘查基金(2016-03号) 贵州省应用基础研究计划重大项目(黔科合JZ字[2014]2005)联合资助
【分类号】：P618.13

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