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首页> 外文期刊>Fuel >Pore structure characterization of North American shale gas reservoirs using USANS/SANS, gas adsorption, and mercury intrusion
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Pore structure characterization of North American shale gas reservoirs using USANS/SANS, gas adsorption, and mercury intrusion

机译：利用USANS / SANS，气体吸附和压汞法对北美页岩气储层的孔隙结构进行表征

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摘要

Small-angle and ultra-small-angle neutron scattering (SANS and USANS), low-pressure adsorption (N_2 and CO_2), and high-pressure mercury intrusion measurements were performed on a suite of North American shale reservoir samples providing the first ever comparison of all these techniques for characterizing the complex pore structure of shales. The techniques were used to gain insight into the nature of the pore structure including pore geometry, pore size distribution and accessible versus inaccessible porosity. Reservoir samples for analysis were taken from currently-active shale gas plays including the Barnett, Mar-cellus, Haynesville, Eagle Ford, Woodford, Muskwa, and Duvernay shales. Low-pressure adsorption revealed strong differences in BET surface area and pore volumes for the sample suite, consistent with variability in composition of the samples. The combination of CO_2 and N_2 adsorption data allowed pore size distributions to be created for micro-meso-macroporosity up to a limit of ~1000 A. Pore size distributions are either uni- or multi-modal. The adsorption-derived pore size distributions for some samples are inconsistent with mercury intrusion data, likely owing to a combination of grain compression during high-pressure intrusion, and the fact that mercury intrusion yields information about pore throat rather than pore body distributions. SANS/USANS scattering data indicate a fractal geometry (power-law scattering) for a wide range of pore sizes and provide evidence that nanometer-scale spatial ordering occurs in lower mesopore-micro-pore range for some samples, which may be associated with inter-layer spacing in clay minerals. SANS/ USANS pore radius distributions were converted to pore volume distributions for direct comparison with adsorption data. For the overlap region between the two methods, the agreement is quite good. Accessible porosity in the pore size (radius) range 5 nm-10 μrn was determined for a Barnett shale sample using the contrast matching method with pressurized deuterated methane fluid. The results demonstrate that accessible porosity is pore-size dependent.
机译：在一组北美页岩储层样品上进行了小角和超小角中子散射（SANS和USANS），低压吸附（N_2和CO_2）以及高压汞侵入测量，提供了首次比较所有这些表征页岩复杂孔隙结构的技术。该技术用于深入了解孔隙结构的性质，包括孔隙几何形状，孔径分布以及可及性与不可及性。用于分析的储层样品取自当前活跃的页岩气层，包括Barnett，Marcellus，Haynesville，Eagle Ford，Woodford，Muskwa和Duvernay页岩。低压吸附显示出样品套件的BET表面积和孔体积有很大差异，这与样品组成的变化一致。 CO_2和N_2吸附数据的组合可为微介孔巨孔隙度创建孔径分布，最高可达〜1000A。孔径分布为单峰或多峰。一些样品的吸附衍生孔径分布与汞侵入数据不一致，这可能是由于高压侵入过程中颗粒压缩的综合作用，以及汞侵入产生的是有关孔喉而不是孔体分布的信息这一事实。 SANS / USANS散射数据表明了大范围孔径的分形几何形状（幂律散射），并提供了证据表明某些样品的纳米级空间有序发生在较低的中孔-微孔范围内，这可能与内部粘土矿物的层间距。将SANS / USANS孔半径分布转换为孔体积分布，以直接与吸附数据进行比较。对于两种方法之间的重叠区域，一致性非常好。对于Barnett页岩样品，使用对比度匹配法和加压氘代甲烷流体，确定了孔径（半径）范围为5 nm-10μm的可访问孔隙率。结果表明，可达到的孔隙度取决于孔径。

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  • 来源
    《Fuel》 |2013年第1期|606-616|共11页
  • 作者

    C.R. Clarkson; N. Solano; R.M. Bustin; A.M.M. Bustin; G.R.L. Chalmers; L. He; Y.B. Melnichenko; A.P. Radlinski; T.P. Blach;

  • 作者单位

    Department of Geoscience, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4;

    Department of Geoscience, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4;

    Department of Earth and Ocean Sciences, 6339 Stores Rd., Vancouver, British Columbia, Canada V62 1Z4;

    Department of Earth and Ocean Sciences, 6339 Stores Rd., Vancouver, British Columbia, Canada V62 1Z4;

    Department of Earth and Ocean Sciences, 6339 Stores Rd., Vancouver, British Columbia, Canada V62 1Z4;

    Neutron Scattering Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;

    Neutron Scattering Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;

    Griffith University, Queensland Micro and Nanotechnology Centre, Kessels Rd., Nathan, Brisbane, Queensland 4111, Australia,Indiana Geological Survey, Indiana University, 611 North Walnut Grove, Bloomington, IN, USA;

    Griffith University, Queensland Micro and Nanotechnology Centre, Kessels Rd., Nathan, Brisbane, Queensland 4111, Australia;

  • 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; small-angle neutron scattering; gas adsorption; mercury-intrusion;

    机译：页岩气孔结构小角中子散射;气体吸附压汞;

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