四川盆地下古生界富有机质泥岩孔径分布及主控因素
首发时间:2016-06-08
摘要:本文选取四川盆地下古生界泥页岩代表性样品7个,运用氮气吸附法进行了孔径分布表征,结果表明:泥岩孔隙以四周开放的具有平行板结构的狭缝孔和墨水瓶状孔为主。 孔径分布曲线存在多个不同的峰值,以3-40nm之间的孔隙为主,主要以3-6nm和10-20nm区间的双峰型分布。结合TOC和矿物组成含量分析,孔隙体积的大小与TOC含量成正比,当TOC含量相近时,粘土矿物含量高的样品提供了更小孔径的孔隙。有机质是泥岩孔隙发育的主控因素,同时也受其他矿物成分的影响。
关键词: 四川盆地;纳米孔隙;富有机质泥岩 氮气吸附法
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The pore size distribution and main controlling factors in organic-rich mudstone of Lower Paleozoic, Sichuan Basin
Abstract:Pore size distribution for 7 core and fresh outcrop shale samples of Lower Paleozoic collected from the organic-rich mudstones, Sichuan basin were investigated by low pressure nitrogen adsorption. The results show that open slit-like and parallel plate structure are major pore types with an pore diameter of 3-40 nm, showing a bimodal pattern of 3-6 nm and 10-20nm mesopores dominated. The pore volume have a positive relationship with TOC integrating total organic carbon (TOC) and mineralogy. In addition, the samples with higher content of clay minerals but similar TOC content contribute more small size pores. Organic matter is the key controlling factor to the shale pore development, and the clay-minerals-hosted pores or detrital-mineral-hosted are present.
Keywords: Sichuan Basin nanopore organic-rich mudstone N2 adsorption
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No.4695757115245114****
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