收稿日期: 2017-01-10
修回日期: 2017-05-09
网络出版日期: 2017-06-10
基金资助
国家自然科学基金重点项目（编号：U1361207)；国家自然科学基金面上项目(编号:41530314）联合资助.
Nanometer pore structure and geological controlsof shale samples in northern Hebei Province,China
Received date: 2017-01-10
Revised date: 2017-05-09
Online published: 2017-06-10
页岩孔隙结构影响到页岩气资源前景乃至后期开发工程，其中纳米级孔隙是主要研究对象。采集不同层系23件黑色页岩样品，对其物质组成和小于100nm孔隙的结构进行测试。结果显示：石炭系—二叠系山西组、太原组样品的总有机碳（TOC）平均含量低于上元古界洪水庄组和下马岭组样品，黏土矿物含量普遍高于洪水庄组和下马岭组并含有大量高岭石，平均孔比表面积和孔容由高到低依次为洪水庄组、下马岭组、山西组和太原组。黏土矿物含量、种类和TOC均显著影响到页岩的孔隙结构：在TOC<2%、2%~4.58%和>4.58% 3个分布段，页岩样品孔比表面积和孔容与黏土矿物含量之间分别呈正相关关系，与TOC含量呈负相关关系；当TOC含量>4.58%时，TOC含量变化对孔隙结构的影响更为明显；而当TOC含量<2%时，黏土矿物含量和种类对孔隙结构的影响更为明显，其中以伊利石含量的影响为主，高岭石含量的影响较小。发现TOC含量/黏土矿物含量之比与孔比表面积和孔容的相关性良好，指示与有机质丰度增高引起的孔比表面积和孔容变化相比，黏土矿物含量增高对孔隙结构的改善效应更为明显，两者的分布关系也是孔隙结构的重要指示影响因素和表征。研究认为，山西组和太原组页岩孔隙结构受黏土矿物特征影响较大，下马岭组和洪水庄组页岩孔隙结构则更多地受到TOC含量的影响。
陈术源，秦勇 . 河北省北部页岩样品纳米级孔隙结构及其影响因素[J]. 天然气地球科学, 2017 , 28(6) : 873 -881 . DOI: 10.11764/j.issn.1672-1926.2017.05.008
Shale pore structure,especially nano-scale pore,can affect the prospect of shale gas resources and even later development engineering.Material composition and pore structures (size<100nm) were investigated via 23 black shale samples from different layers.The results showed that the average content of the total organic carbon (TOC) of samples from Carboniferous-Permian Shanxi and Taiyuan formations are lower than that from Upper Proterozoic Hongshuizhuang and Xiamaling formations.However,the clay mineral content of samples from Carboniferous-Permian is higher than those from Upper Proterozoic,especially kaolinite.Descending order of the average pore size and average pore volume are Hongshuizhuang Formation,Xiamaling Formation,Shanxi Formation and Taiyuan Formation.The clay mineral content,type and TOC can significantly affect the pore structure of shale.There are three segments of TOC content,<2%,2%-4.58% and >4.58%.The specific surface area and pore volume have a positive correlation with clay minerals content,but have a negative correlation with TOC,respectively.When TOC content is >4.58%,the change of TOC content has more obvious effects on the pore structure.When TOC content is <2%,the clay mineral contents and types have obvious effects on the pore structure,and effects of illite is larger than that of kaolinite.The ratio of TOC content to clay mineral content has a good correlation with specific surface area and pore volume,which indicates that compared to the changing degree of the specific surface area and pore volume caused by the organic matter abundance,the change caused by clay minerals content increasing is more obvious.Both distributions are also the important instructions and characterization of the pore structure.In a word,the characteristics of clay minerals have great influence on the pore structure of shale from Shanxi and Taiyuan formations,and TOC content has great influence on the pore structure of shale from Xiamaling and Hongshuizhuang formations.
Key words： Shale gas; Pore structure; TOC; Clay mineral; Proportion relationship
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