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Experimental study and modelling of methane adsorption and diffusion in shale

机译:页岩中甲烷吸附扩散的实验研究与建模

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摘要

Understanding gas storage and transport mechanisms in shale is crucial for reservoir evaluation and gas production forecast. The shale matrix has a complex pore structure, with sizes ranging from nanometres to micrometres. Although diffusion plays a significant role in shale gas transport in the reservoir, systematic studies of gas diffusion in shale are rare. This paper studied the methane diffusion behaviour of shale based on pore structure, as well as the effects of sample particle size and water on gas adsorption and diffusion. The combined N_2 adsorption and SEM experimental results showed that the shale sample had a bimodal pore size distribution. The diffusion data were able to be described adequately by the bidisperse model, and the parameters were consistent with pore size distribution results obtained from the N_2 adsorption and SEM results. It was found that both Fickian diffusion and Knudsen diffusion play important roles in shale gas diffusion and they show different gas pressure dependence. Adsorption isotherm and calculated diffusivity showed little particle size dependence. However, gas adsorption and dif-fusivity were significantly reduced in moist samples, showing that water reduces gas storage capacity and transport rate in shale.
机译:了解页岩中的天然气储运机制对于评估储层和预测天然气产量至关重要。页岩基质具有复杂的孔隙结构,尺寸范围从纳米到微米。尽管扩散在页岩气在储层中的运输中起着重要作用,但是对页岩中气体扩散的系统研究却很少。本文基于孔隙结构研究了页岩的甲烷扩散行为,以及样品粒径和水分对气体吸附和扩散的影响。结合N_2吸附和SEM实验结果表明,该页岩样品具有双峰孔径分布。通过双分散模型可以很好地描述扩散数据,并且该参数与从N_2吸附和SEM结果获得的孔径分布结果一致。发现Fickian扩散和Knudsen扩散在页岩气扩散中都起着重要作用,并且它们表现出不同的气压依赖性。吸附等温线和计算的扩散率显示出很小的粒度依赖性。但是,潮湿样品中的气体吸附和扩散系数显着降低,表明水降低了页岩中的储气能力和传输速率。

著录项

  • 来源
    《Fuel》 |2014年第ptaa期|509-519|共11页
  • 作者单位

    Key laboratory of Engineering Ceomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,CSIRO Earth Science and Resource Engineering, Private Bag 10, Clayton South, Victoria 3169, Australia;

    CSIRO Earth Science and Resource Engineering, Private Bag 10, Clayton South, Victoria 3169, Australia;

    Key laboratory of Engineering Ceomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    CSIRO Earth Science and Resource Engineering, Private Bag 10, Clayton South, Victoria 3169, Australia;

    CSIRO Earth Science and Resource Engineering, Private Bag 10, Clayton South, Victoria 3169, Australia,School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;

    CSIRO Earth Science and Resource Engineering, Private Bag 10, Clayton South, Victoria 3169, Australia;

    Key laboratory of Engineering Ceomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    Key laboratory of Engineering Ceomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Shale gas; Pore structure; Bidisperse model; Diffusivity; Methane;

    机译:页岩气孔结构;双分散模型扩散性甲烷;

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