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天然气地球科学

• 非常规天然气 • 上一篇    下一篇

页岩气在基质纳米孔隙中的渗流模型

吴剑，常毓文，梁涛，郭晓飞，陈新彬   

  1. 中国石油勘探开发研究院，北京 100083
  • 收稿日期:2014-02-26 修回日期:2014-07-01 出版日期:2015-03-10 发布日期:2015-03-10
  • 作者简介:吴剑(1986-)，男，贵州黔东南人，博士研究生，主要从事油藏工程与油气开发规划研究.E-mail:wusword668@163.com.
  • 基金资助:
    国家科技重大专项“我国油气剩余可采储量分布、增长潜力与开发理论”(编号:2011ZX05043-002)资助.
     

Shale Gas Flow Model in Matrix Nanoscale Pore

WU Jian，CHANG Yu-wen，LIANG Tao，GUO Xiao-fei，CHEN Xin-bin   

  1. Research Institute of Petroleum Exploration & Development,CNPC,Beijing,100083
  • Received:2014-02-26 Revised:2014-07-01 Online:2015-03-10 Published:2015-03-10

PDF (PC)

509

摘要：

基质孔隙中页岩气包括孔隙中的自由气、孔隙壁面的吸附气、溶解于有机质中的溶解气，大量文献显示页岩孔隙和喉道皆为纳米级，尽管孔隙小、气体扩散慢，但页岩基质比表面较大、溶解气量大，溶解气的扩散作用具有重要影响。根据Farzam Javadpour渗流理论，假设页岩基质为岩石颗粒、黏土、干酪根的均质体，认为基质纳米孔隙中气体运移是压力作用下气体滑脱、克努森扩散、气体吸附解吸、溶解于干酪根中的气体向孔隙动力扩散等共同作用的结果，且吸附气符合Langmuir等温吸附机理，从而采用微元法推导出页岩气基质孔隙渗流模型。

关键词:
页岩气, 渗流单元, 纳米孔隙, 渗流模型, 非常规天然气

Abstract:

Matrix shale gas includes free gas stored in pores,adsorbed gas in pore walls,soluble gas in solid organic materials.Shale pores are nanometer and pore throat apertures are microport by literature investigation.Although shale matrix pores are very small and soluble gas diffusion is slow,surface to volume ratio is comparatively large,soluble gas quantity is substantial,soluble gas diffusion is very important.According to Javadpour flow theory,shale matrix is assumed as homogeneous rock particles,clay,kerogen reservoir.Shale gas migration is slippage under press force,Knudsen diffusion,adsorbed gas desorption and soluble gas diffusion combined effect,gas adsorption-desorption follows Langmuir's isotherm,then shale gas matrix pore flow model is lastly derived by infinitesimal method.

Key words: Shale gas, Flow unit, Nanopores, Flow model, Unconventional natural gas

中图分类号: 

  • TE132.2

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