现代地质Issue(1)：163-171,9.
渝东南地区龙马溪组高演化页岩微纳米孔隙非均质性及主控因素
Micro/Nano Pore Heterogeneity and Main Controlling Factors of the High-Maturity Longmaxi Formation Shale in Southeastern Chongqing
摘要
Abstract
Studying shale pores is the key to understand the mechanism of shale gas occurrence and accumula-tion.But there is little effective means to quantitatively depict micro /nano pore heterogeneity characteristics of high-maturity shales.This article quantitatively analyzed micro /nano pore heterogeneity and main controlling factors of the high-maturity Longmaxi Formation Shale in southeastern Chongqing through the low pressure N2 adsorption /desorption,high-pressure mercury injection (MIP),and field emission scanning electron microscopy (FE-SEM)experiment together with the use of the fractal dimension.The results show that micro /nano pores develop very well in high-maturity shale.Mesopores are mainly slit-shaped clay interparticle pores and ink-bottle-shaped organic pores.Fractal dimensions of pores between 2.0 nm and 4.5 nm in diameter have an average val-ue of 2.853,4,while fractal dimensions of pores between 4.5 nm and 50.0 nm in diameter have an average val-ue of 2.736,7.The strong heterogeneity is mainly controlled by organic matters.When total organic carbon (TOC)content is less than 0.9%,the pores provided by minerals play dominant role,while the TOC content is larger than 1.7%,organic pores play dominant role.In addition,the increase of clay mineral content will in-crease the mesopores heterogeneity in a certain extent.Macropores are mainly composed of slit-shaped interpar-ticle pores and a small amount of ink-bottle-shaped organic pores.Fractal dimensions of macropores have an av-erage value of 2.844,1,which show strong heterogeneity,indicating the pore structure is complex.The hetero-geneity of macropores is mainly controlled by quartz and carbonate minerals.With the increase of carbonate minerals content,the degree of heterogeneity increases.As organic pores size is relatively small,they have no obvious influence on shale macropore heterogeneity.关键词
非均质性/主控因素/分形维数/孔隙结构/高演化页岩Key words
heterogeneity/main controlling factor/fractal dimension/pore structure/high-maturity shale分类
能源科技引用本文复制引用
唐相路,姜振学,李卓,李卫兵,杨佩佩,黄何鑫,郝进..渝东南地区龙马溪组高演化页岩微纳米孔隙非均质性及主控因素[J].现代地质,2016,(1):163-171,9.基金项目
国家科技重大专项课题（2011 ZX05018－002）；国家自然科学基金项目（41472112）；国土资源部项目（12120114046701）；重庆市国土资源和房屋管理局科技计划重大项目（CQGT －KJ －2012）。 （）
