页岩吸附性能及孔隙结构特征——以四川盆地龙马溪组页岩为例

doi:10.7623/syxb201305003

石油学报 ›› 2013, Vol. 34 ›› Issue (5): 826-832.DOI: 10.7623/syxb201305003

页岩吸附性能及孔隙结构特征——以四川盆地龙马溪组页岩为例

薛华庆^1,2,3,4, 王红岩^2,3,4, 刘洪林^2,3,4, 闫刚^2,3,4, 郭伟^2,3,4, 李小龙^2,3,4

1. 清华大学热能工程系北京 100084;
2. 中国石油勘探开发研究院廊坊分院河北廊坊 065007;
3. 中国石油天然气集团公司非常规油气重点实验室河北廊坊 065007;
4. 国家能源页岩气研发(实验)中心河北廊坊 065007

收稿日期:2013-03-26 修回日期:2013-06-26 出版日期:2013-09-25 发布日期:2013-08-01
通讯作者: 薛华庆
作者简介:薛华庆,男,1982年10月生,2005年获中国石油大学(华东)学士学位,现为中国石油勘探开发研究院廊坊分院工程师,清华大学博士研究生,主要从事页岩气储层实验测试技术研究。Email:hqxue@petrochina.com.cn
基金资助:
国家重大科技专项"页岩气勘探开发关键技术"(2011ZX05018)资助。

Adsorption capability and aperture distribution characteristics of shales：taking the Longmaxi Formation shale of Sichuan Basin as an example

XUE Huaqing^1,2,3,4, WANG Hongyan^2,3,4, LIU Honglin^2,3,4, YAN Gang^2,3,4, GUO Wei^2,3,4, LI Xiaolong^2,3,4

1. Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;
2. Langfang Branch, PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, China;
3. CNPC Key Laboratory of Unconventional Oil & Gas, Langfang 065007, China;
4. National Energy Shale Gas Research & Development (Experimental) Center, Langfang 065007, China

Received:2013-03-26 Revised:2013-06-26 Online:2013-09-25 Published:2013-08-01

摘要/Abstract

摘要：

四川盆地昭通区块龙马溪组页岩的TOC含量和现场含气量测试显示,下段页岩含气性好,储层也具有可改造性。利用全岩及黏土矿物分析、等温吸附实验、比表面及孔径分布等实验研究,发现页岩中干酪根纳米级孔隙发育,孔径主要分布在2~60 nm,是页岩比表面的主要贡献者。页岩与干酪根的吸附-脱附曲线形态也说明了这一现象,两者基本相似,都具有明显的滞后环。而页岩中黏土也具有一定比表面积,其含量与页岩的比表面不存在相关性。因此,TOC含量增加,页岩的比表面积增大,吸附能力增强,饱和吸附量变大,使得含气量增加。

关键词: 页岩, 含气量, 吸附能力, 比表面, 孔径分布

Abstract:

TOCs of Longmaxi Formation source rocks and gas-content measurements of shale gas wells in the Zhaotong block, Sichuan Basin showed that the gas content of lower-interval shales is better and the brittleness index of lower-interval reservoirs also indicated adjacent shale formations suitable for stimulation. Based on bulk rock and clay mineral analyses as well as experiments of isothermal adsorption, specific surface areas and aperture distributions, the organic matter (kerogen) in shales was found abundant in well-developed nano-pores with an aperture of 2-60nm, which are major contributors to the specific surface area of shales. This can be also implied by the adsorption and desorption curves of kerogens to and from shales because the shape of the curves is generally alike, having a hysteresis loop. However, the clay in shales shows a certain specific surface area whose content has no relationship with the specific surface area of shales. Therefore, with the increase of TOC, the specific surface area of shales increases and their adsorption capacity strengthens as well, resulting in an increase in the saturated adsorption capability and gas content.

Key words: shale, gas content, adsorption capability, specific surface area, aperture distribution

中图分类号:

TE112.222

薛华庆, 王红岩, 刘洪林, 闫刚, 郭伟, 李小龙. 页岩吸附性能及孔隙结构特征——以四川盆地龙马溪组页岩为例[J]. 石油学报, 2013, 34(5): 826-832.

XUE Huaqing, WANG Hongyan, LIU Honglin, YAN Gang, GUO Wei, LI Xiaolong. Adsorption capability and aperture distribution characteristics of shales：taking the Longmaxi Formation shale of Sichuan Basin as an example[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(5): 826-832.

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页岩吸附性能及孔隙结构特征——以四川盆地龙马溪组页岩为例

Adsorption capability and aperture distribution characteristics of shales：taking the Longmaxi Formation shale of Sichuan Basin as an example

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