岩性油气藏 ›› 2020, Vol. 32 ›› Issue (5): 151–160.doi: 10.12108/yxyqc.20200516

• 油气田开发 • 上一篇    下一篇

基于REV尺度格子Boltzmann方法的页岩气藏渗流规律

符东宇, 李勇明, 赵金洲, 江有适, 陈曦宇, 许文俊   

  1. 油气藏地质及开发工程国家重点实验室·西南石油大学, 成都 610500
  • 收稿日期:2019-12-12 修回日期:2020-02-18 出版日期:2020-10-01 发布日期:2020-08-08
  • 作者简介:符东宇(1991-),男,西南石油大学在读博士研究生,研究方向为油气藏增产改造。地址:(610500)四川省成都市新都区新都大道8号西南石油大学。Email:swpufudongyu@hotmail.com。
  • 基金资助:
    四川省青年科技创新研究团队专项计划项目“页岩气体积压裂排液控制技术研究”（编号：2017TD0013）、国家自然科学基金重大项目“页岩地层动态随机裂缝控制机理与无水压裂理论”（编号：51490653）联合资助

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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摘要： 页岩储层一般天然微裂缝发育，基质孔隙结构复杂，使得页岩气渗流过程呈现出多尺度多场耦合的特征。为了研究页岩气藏复杂的渗流规律，重构了天然微裂缝发育的页岩储层多孔介质模型，并围绕页岩气多重运移机制对广义格子Boltzmann模型进行了修正，建立了适用于模拟页岩气渗流特征的表征单元体（REV）尺度格子Boltzmann模型（LB模型），并基于天然微裂缝物性特征以及气体滑脱、吸附/解吸、表面扩散效应等渗流特征对该模型进行了敏感性参数分析。结果表明：当页岩储层天然微裂缝较发育时，微裂缝为气体在基质中流动的主要通道；其中裂缝密度是影响储层表观渗透率的主要参数，裂缝密度增大3～4倍，储层表观渗透率可增大10倍以上，而裂缝长度以及裂缝开度的影响程度均次之；努森数（Kn）是影响页岩气渗流的主要参数，随着Kn增大，克氏效应愈显著，特别当Kn > 0.1时，多孔介质表观渗透率增幅显著增大；页岩储层多孔介质表观渗透率会随着吸附气量的增大而减小，特别是当储层压力较低时，该现象更为显著；气体表面扩散效应对页岩气渗流过程的影响程度大，同等条件下考虑气体表面扩散效应的储层表观渗透率较忽略该效应可提升2～5倍，但提升作用受制于储层吸附气量的多少。该研究成果为页岩气微观渗流理论研究提供了新思路，为页岩气藏高效勘探开发提供了技术支撑。

关键词: 页岩气藏, 多孔介质, 微裂缝, 格子Boltzmann方法, 表征单元体尺度, 渗流规律

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

中图分类号: 

  • TE371
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