Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (5): 151-160.doi: 10.12108/yxyqc.20200516

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Gas seepage flow law of shale gas reservoirs based on REV-scale lattice Boltzmann method

FU Dongyu, LI Yongming, ZHAO Jinzhou, JIANG Youshi, CHEN Xiyu, XU Wenjun   

  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
  • Received:2019-12-12 Revised:2020-02-18 Online:2020-10-01 Published:2020-08-08

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Abstract: Shale gas reservoirs are characterized by multi-scale and multi-field transport behaviors owing to the various natural micro-fractures and complex matrix pore structures. In order to study the complex seepage law of shale gas reservoir,a micro-fractured porous medium was reconstructed,the generalized lattice Boltzmann model was modified,and representative elementary volume(REV)scale lattice Boltzmann model(LB model)suitable for simulating the seepage characteristics of shale gas was established. Based on the physical properties of natural micro-fractures and seepage flow characteristics of gas slippage,gas adsorption-desorption and surface diffusion, the sensitivity parameters of the model were analyzed. The results show that the micro-fractures become the main channel for gas flow in the matrix when the natural micro-fractures of shale reservoir are relatively developed, the fracture density is the main parameter affecting the apparent permeability of the reservoir. When the fracture density was increased by 3-4 times,the apparent permeability of the reservoir can be increased by more than 10 times,and the fracture aperture and fracture length have less effect. Knudsen number(Kn) is a primary parameter which has great influence on the shale gas flow behaviors. The Klinkenberg effect become more remarkable due to the increasing Knudsen number,especially when Kn > 0.1,the increase rate of the apparent permeability becomes more significant. Moreover,the increasing adsorbed gas concentration is accounting for the decreasing apparent permeability,particularly in case of the lower pressure. The surface diffusion has great impacts on the gas flow behaviors,the apparent permeability could be 2 to 5 times larger than its counterparts in case the effect of surface diffusion has been ignored. However,the strength of this effect is subject to adsorbed gas concentration. This study could provide some instructive insights into the theoretical research of the shale gas seepage mechanism and some technological support for the exploration and exploitation of shale gas reservoirs.

Key words: shale gas reservoirs, porous media, micro-fracture, lattice Boltzmann method, representative elementary volume scale, seepage law

CLC Number: 

  • TE371
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