岩土力学 ›› 2022, Vol. 43 ›› Issue (7): 1803-1815.doi: 10.16285/j.rsm.2021.1690

• 基础理论与实验研究 • 上一篇    下一篇

平均有效应力对煤系页岩瓦斯微观吸附−解吸 特性影响试验研究

田虎楠1，唐巨鹏1, 2，潘一山3，余泓浩1   

  1. 1. 辽宁工程技术大学 力学与工程学院，辽宁 阜新 123000；2. 辽宁工程技术大学 新能源研究中心，辽宁 阜新 123000； 3. 辽宁大学 物理学院，辽宁 沈阳 110036
  • 收稿日期:2021-10-08 修回日期:2022-04-27 出版日期:2022-07-26 发布日期:2022-08-04
  • 通讯作者: 唐巨鹏，男，1976年，博士，教授，博士生导师，主要从事岩石力学、新能源开采（煤层气、页岩气、地热开发）的研究工作。 E-mail: tangjupeng@edu.cn E-mail: tianhunan1985@126.com
  • 作者简介:田虎楠，男，1985年，博士研究生，主要从事非常油气开采的研究工作。
  • 基金资助:
    国家自然科学基金（No. 51874165）；辽宁省“兴辽英才计划”项目（No. XLYC1902106）。

Experimental study on the effect of average effective stress on micro adsorption and desorption characteristics of coal shale gas

TIAN Hu-nan1, TANG Ju-peng1, 2, PAN Yi-shan3, YU Hong-hao1   

  1. 1. School of Mechanics and Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, China; 2. New Energy Research Center, Liaoning Technical University, Fuxin, Liaoning 123000, China; 3. School of Physics, Liaoning University, Shenyang, Liaoning 110036, China
  • Received:2021-10-08 Revised:2022-04-27 Online:2022-07-26 Published:2022-08-04
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51874165) and Liaoning Province "Xing Liao Talent Program" (XLYC1902106).

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摘要： 页岩气井初期和后期产气规律差异本质上是三维应力变化下微观游离态、吸附态瓦斯赋存运移产出机制不同。为从微观角度揭示平均有效应力对煤系页岩气井生产初期游离态瓦斯和后期吸附态瓦斯产出规律影响，以双鸭山盆地东保卫煤矿36#煤层底板煤系页岩为研究对象，采用核磁共振T2谱技术对模拟原位应力状态煤系页岩试样进行瓦斯微观吸附−解吸试验。以平均有效应力作为煤系页岩所受原位应力状态指标，以核磁共振T2谱幅值积分作为煤系页岩微观吸附态、游离态瓦斯含量定量表征指标，定量研究了吸附−解吸过程中煤系页岩微观吸附态和游离态瓦斯含量与平均有效应力的关系，及微观吸附态和游离态瓦斯迟滞系数与平均有效应力的关系，通过多因素线性回归明确了平均有效应力对煤系页岩微观吸附态和游离态瓦斯赋存产出规律影响。试验发现：吸附−解吸过程煤系页岩微观吸附态瓦斯含量与平均有效应力关系分别符合Dubinin-Radushkevich，（简称D-R）函数模型和Weibull函数模型，吸附−解吸过程微观游离态瓦斯含量与平均有效应力均符合线性函数模型；微观吸附态瓦斯迟滞系数随着平均有效应力降低以对数函数规律快速减小；平均有效应力降低对微观游离态瓦斯迟滞系数影响不大，游离态瓦斯迟滞系数近似为定值41.53%；孔隙压力和轴压分别是微观吸附态瓦斯吸附和解吸主控应力因素，游离态瓦斯赋存和产出主要与围压有关。

关键词: 煤系页岩, 吸附-解吸, 平均有效应力, 核磁共振 T2谱, 吸附态瓦斯, 游离态瓦斯

Abstract: The difference of gas production law between initial stage and later stage of shale gas well is essentially attributed to the difference of occurrence, migration and production mechanisms of adsorbed gas and porous medium-confined gas in three dimensional stress states. In order to reveal the influence of average effective stress on the production law of porous medium-confined gas in the initial stage and adsorbed gas in the later stage of coal shale gas well production from a micro perspective, and to simulate the whole processes of coal shale gas adsorption and desorption in situ stress state, nuclear magnetic resonance T2 spectrums method was applied to the whole process of experimental research on isothermal adsorption and desorption of the same coal shale sample situ stress state from Dongbaowei Mine #36 seam in Shuangyashan basin. The average effective stress was taken as the comprehensive measurement index of coal shale, and the amplitude integral of nuclear magnetic resonance T2 spectrum was used as the characterization index of micro adsorbed gas and porous medium-confined gas. The relationships between micro adsorbed and porous medium-confined gas content and average effective stress of coal shale in adsorption and desorption were quantitatively studied. The relationships between the hysteresis coefficient of micro adsorbed and porous medium-confined gas and the average effective stress were studied quantitatively. The influence of average effective stress on the occurrence and output of micro adsorbed and porous medium-confined gas in coal shale was clarified by multi factor linear regression. The experimental results showed that, the adsorbed gas content of coal shale and average effective stress could be fitted by Dubinin-Radushkevich function model in the adsorption and they could be fitted by Weibull function model in the desorption. The porous medium-confined gas content of coal shale and average effective stress could be fitted by linear function model. The hysteresis coefficient of micro adsorbed gas and the average effective stress accorded with the logarithmic function model. However, the decrease of average effective stress had little effect on the hysteresis coefficient of micro free gas, and the hysteresis coefficient of porous medium-confined gas was approximately 41.53%. The pore pressure of reservoir and vertical stress of overlying strata were the main control stress factors of micro adsorption and desorption, respectively. The occurrence and output of free gas were mainly related to the stress of surrounding rock.

Key words: coal shale, adsorption-desorption, average effective stress, nuclear magnetic resonance T2 spectrums, adsorbed gas, porous medium-confined gas

中图分类号: 

  • TE 327
[1] 张宏学, 刘卫群, . 非平衡解吸状态下页岩气储层渗透率演化机制[J]. 岩土力学, 2021, 42(10): 2696-2704.
[2] 唐巨鹏，田虎楠，于 宁，丁佳会. 瓦斯压力对煤系页岩瓦斯吸附特性影响核磁共振谱试验研究[J]. , 2016, 37(S2): 203-208.
[3] 张宏学 ，刘卫群 ，朱 立,. 页岩储层裂隙渗透率模型和试验研究[J]. , 2015, 36(3): 719-729.
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