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川西盆地上三叠统须家河组页岩纳米孔隙结构特征
引用本文:刘惟庆,吴伟,唐玄,王雨涵.川西盆地上三叠统须家河组页岩纳米孔隙结构特征[J].科学技术与工程,2014,14(21).
作者姓名:刘惟庆  吴伟  唐玄  王雨涵
作者单位:河南理工大学 资源环境学院,河南理工大学 资源环境学院,中国地质大学北京 能源学院,北京,河南理工大学 资源环境学院
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
摘    要:页岩储层的纳米孔隙结构对页岩含气性评价和勘探开发具有重要意义,但目前关于国内沉积盆地页岩纳米孔隙结构的研究相对不足。本文利用低温氮气吸附和扫描电镜等方法,对川西盆地上三叠统须家河组页岩纳米级孔隙进行了分析。结果表明:①川西盆地须家河组页岩比表面积主要由过渡孔和微孔提供,比表面积范围6.588m2/g-9.476m2/g,平均为7.949m2/g,远大于致密砂岩储层比表面积;②页岩孔径平均为4.319nm-7.821nm,孔径范围具有从微孔到中孔等一系列连续性孔径。孔隙形状有多种类型,微孔以单边封闭型孔和墨水瓶型孔为主,过渡孔和中孔具有一定数量的两端开口型孔;③页岩广泛发育的有机质纳米孔、粘土矿物粒间孔主要提供了天然气吸附场所;矿物粒内孔隙和微裂隙为游离气主要赋存场所并提供了天然气渗流通道。

关 键 词:川西盆地  须家河组  页岩孔隙结构  氮气吸附
收稿时间:2013/12/17 0:00:00
修稿时间:2014/4/18 0:00:00

Shale nano-pore structure characteristics of Xujiahe Formation of Upper Triassic in western Sichuan basin
LIU Wei-qing,WU Wei,TANG Xuan and WANG Yu-han.Shale nano-pore structure characteristics of Xujiahe Formation of Upper Triassic in western Sichuan basin[J].Science Technology and Engineering,2014,14(21).
Authors:LIU Wei-qing  WU Wei  TANG Xuan and WANG Yu-han
Institution:School of Resources and Environment,Henan Polytechnic University,School of Energy Resources,China University of Geosciences,School of Resources and Environment,Henan Polytechnic University
Abstract:Nanometer pore structure of shale reservoir is of great importance for both shale hydrocarbon evaluation and exploration. But currently, the research of shale nano pore structure of sedimentary basins is relatively insufficient. This paper analyses the Shale nanopore structure characteristics of Xujiahe Formation of Upper Triassic in western Sichuan basin by using the methods of low temperature nitrogen adsorption and scanning electron microscopy. The results are the following. First, shale specific surface area of western Sichuan basin Xujiahe Formation is in scope of 6.588m2/g-9.476m2/g provided by transitional span and micro pore, which is larger than tight sandstone specific surface area. Second, the average of shale aperture is in range of 4.319nm~7.821nm. The pore is a series of successive pore range from micropore to mesopore. There are different types of pore shape. Micro pore is mainly of unilateral closed hole and ink bottle type hole, while transitional pore and mesopore has a certain amount of open rack holes on both ends. Third, organic nanopore grown from sale and clay mineral interganular pore dominatingly provides the natural gas adsorption sites. Mineral interganular pore and microcarcks are the main occurrence places of free gas and provide natural gas seepage channel.
Keywords:western Sichuan basin  Xujiahe Formation  shale pole structure  Nitrogen adsorption
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