高压压汞法和氮气吸附法分析页岩孔隙结构

杨峰,宁正福,孔德涛,刘慧卿

doi:10.11764/j.issn.1672-1926.2013.03.450

天然气地球科学 >

2013 , Vol. 24 >Issue 3: 450 - 455

DOI: https://doi.org/10.11764/j.issn.1672-1926.2013.03.450

非常规天然气

高压压汞法和氮气吸附法分析页岩孔隙结构

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中国石油大学（北京）石油工程教育部重点实验室,北京 102249

杨峰（1987-），男，湖北天门人，博士研究生，主要从事非常规气藏开发研究.E-mail:yangfeng227@163.com.

收稿日期: 2012-10-13

修回日期: 2013-01-23

网络出版日期: 2013-06-10

基金资助

国家自然科学基金项目（编号:51274214）；教育部科学技术研究重大计划项目（编号:311008）；油气资源与探测国家重点实验室自主研究课题（编号:PRP/indep-3-1108）联合资助.

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Pore Structure of Shales from High Pressure Mercury Injectionand Nitrogen Adsorption Method

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（MOE Key Laboratory of Petroleum Engineering in China University of Petroleum,Beijing 102249,China）

Received date: 2012-10-13

Revised date: 2013-01-23

Online published: 2013-06-10

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摘要

页岩储层的孔隙结构对页岩含气性评价和勘探开发具有重要意义，但目前国内对于页岩孔隙结构的研究相对较少。为此，采用高压压汞实验和低温氮气吸附实验对页岩的孔隙结构进行了研究，计算了页岩的孔隙结构参数，并结合微观孔隙结构图片分析了页岩孔隙结构对气体吸附和渗流的意义。研究表明，页岩孔隙以微孔和过渡孔为主，微孔和过渡孔提供了大部分孔体积。有机质中的微孔是页岩比表面积的主要贡献者，构成了页岩气体的主要吸附空间。页岩的孔隙类型复杂，孔隙形态多样，存在一端封闭的不透气性孔、开放性的透气性孔和墨水瓶孔等多种孔隙，且孔隙之间的连通性较差。较高的微孔和过渡孔保证了页岩储层具有很高的吸附聚气能力，但中孔和大孔发育较差，不利于气体渗流和页岩气藏的开发。

关键词： 页岩; 孔隙结构; 高压压汞; 氮气吸附; 孔体积; 比表面积

本文引用格式

杨峰,宁正福,孔德涛,刘慧卿 . 高压压汞法和氮气吸附法分析页岩孔隙结构[J]. 天然气地球科学, 2013 , 24(3) : 450 -455 . DOI: 10.11764/j.issn.1672-1926.2013.03.450

Abstract

The pore structure of shales plays an important role in the evaluation of hydrocarbon content,gas exploration and development.However,there is little study on the pore structure of shales at home.High-pressure mercury injection and nitrogen adsorption experiments are employed to study the pore structure of shales and the pore structure parameters are also obtained.The effect of pore structure on gas adsorption and movement is analyzed.The results show that micropores and transitional pores are the main pore in shales,which provide the vast majority of pore volume.Micropore in the organic matter is the primary contributor to specific surface area and functions as the main adsorption space.The pore types are complicated and the pore morphology is diverse.There are airtight pores with a close end,air pores,and ink-bottle pores in shales and the pore connectivity is poor.The high content of micropore and transitional pore is beneficial for gas adsorption in shales,but the mesopore and macropore are backward,which goes against for shale gas seepage and production.

Key words： Shale; Pore structure; High-pressure mercury injection; Nitrogen adsorption; Pore volume; Specific surface area

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