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
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
Chen Shu-yuan,Qin Yong . Nanometer pore structure and geological controlsof shale samples in northern Hebei Province,China[J]. Natural Gas Geoscience, 2017 , 28(6) : 873 -881 . DOI: 10.11764/j.issn.1672-1926.2017.05.008
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