Micro-pore Structure of Gas Shale and Its Effect on Gas Mass Transfer

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  • 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2.Langfang Branch,Research Institute of Petroleum Exploration and Development, PetroChina, Langfang 065007, China
     

Received date: 2013-01-24

  Revised date: 2013-03-01

  Online published: 2013-12-10

Abstract

The pore structures of gas shale have great significance to understand gas storage mechanisms,estimation of initial gas in-place and deliverability of multi-scaled pores.The micro-pore structure has been investigated through mercury injection capillary pressure (MICP) and nitrogen adsorption method.Then,the effect of pore diameter on shale gas mass transfer modes was analyzed in pores based on Knudsen number.The MICP results show that there are three peaks in pore-throat size distribution curves,and up to 90% of the total pore volumes are located in nanopores with pore diameter less than 100nm.Nitrogen adsorption analysis indicates that average diameter for nanopores ranges from 3.78nm to 10.09nm and 77% to 99% of the total BET surface areas mainly come from pores with size in diameter less than 10nm.Based on the theory of molecular dynamics,the modes of gas-transport controlled by pore dimension are summarized as four types: non-slip percolation,slip percolation,transition flow,and diffusion.The gas flow types in pores are variable during different development stages.And gas diffusion type and diffusivity within shale pores are greatly influenced by pore size at middle-late stage of shale gas reservoir.

Cite this article

CHEN Qiang,KANG Yi-li,YOU Li-jun,YU Yang-feng,LIU Hong-lin . Micro-pore Structure of Gas Shale and Its Effect on Gas Mass Transfer[J]. Natural Gas Geoscience, 2013 , 24(6) : 1298 -1304 . DOI: 10.11764/j.issn.1672-1926.2013.06.1298

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