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首页> 外文期刊>Energy & fuels >Nanopore Size Distribution Heterogeneity of Organic-Rich Shale Reservoirs Using Multifractal Analysis and Its Influence on Porosity- Permeability Variation
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Nanopore Size Distribution Heterogeneity of Organic-Rich Shale Reservoirs Using Multifractal Analysis and Its Influence on Porosity- Permeability Variation

机译：纳米孔尺寸分布使用多法分析的有机富含物体储层的异质性及其对孔隙率变化的影响

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摘要

The shale nanopore size (diameter 100 nm) distribution heterogeneity (SNDH) is one of the important factors affecting gas production. However, quantitative analysis of the SNDH and the applicability of single and multifractal models need to be further studied. Here, based on low-temperature liquid nitrogen and carbon dioxide tests of organic-rich shale in Qinshui Basin, multifractal dimension variation of micropores (2 nm) and mesopores (2-100 nm) are studied, and the multifractal factors that affect the distribution of nanopores are determined. Additionally, the differences between single fractal and multifractal results are compared. Based on this, dynamic variation of porosity and permeability under the constraints of the nanopore structure is discussed from the perspective of multifractal variation. The results of this study are as follows: (1) The pore size distribution of micropores and meso-macropores in shale samples exhibit typical multifractal behavior. The overall distribution heterogeneity of meso-macropores is mainly affected by the distribution of pores in the low-value area of pore volume (LAPV), while the overall distribution heterogeneity of micropores is affected by the distribution of the high-value area of the pore volume. The multifractal parameters and influencing factors of micropores and meso-macropores are clearly different. (2) The single fractal dimension D-2 calculated using the Frenkel-Halsey-Hill model has a negative correlation with the multifractal parameters, implying that the distribution heterogeneity of the LAPV gradually decreases with the increase of the D2 value, indicating that the physical meaning of the two models is obviously different. (3) The pore distribution heterogeneity affects permeability variation and diffusion process of shale reservoir. With the increase of the multifractal dimension of meso-macropores, the damaging effect of stress on permeability is stronger. The more heterogeneous the micropore size distribution, the smaller is the "modification effect" of stress on the diffusion coefficient.
机译：页岩纳米孔尺寸（直径<100nm）分布异质性（SNDH）是影响天然气生产的重要因素之一。然而，需要进一步研究对SNDH的定量分析和单一和多分术模型的适用性。在此，基于秦水盆地有机富含物体的低温液氮和二氧化碳试验，研究了微孔（＆lt 2 nm）和中孔（2-100nm）的多分术尺寸变化，以及影响的多重因子确定纳米孔的分布。另外，比较单个分形和多重分术结果之间的差异。基于此，从多法变化的角度讨论了纳米孔结构的约束下的孔隙率和渗透率的动态变化。本研究的结果如下：（1）页岩样品中微孔和中间麦克风的孔径分布表现出典型的多分术行为。 Meso-macropores的总分布异质性主要受孔体积低值面积（LAPV）中孔隙分布的影响，而微孔的总分布异质性受到孔的高价值区域的分布的影响体积。微孔和Meso-Macropores的多重分术参数和影响因素显然是不同的。 （2）使用Frenkel-Halsey-Hill模型计算的单分形尺寸D-2与多法分术参数具有负相关性，这意味着LAPV的分布异质性随着D2值的增加而逐渐降低，表明物理这两种型号的含义显然是不同的。 （3）孔隙分布异质性影响页岩储层的渗透性变化和扩散过程。随着中瘤大孔的多分术尺寸的增加，压力对渗透性的破坏性效果更强。微孔尺寸分布越多，较小的是扩散系数的应力“修改效应”越小。

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  • 来源
    《Energy & fuels》 |2021年第17期|13700-13711|共12页
  • 作者

    Yan Gaoyuan; Qin Zhengyuan; Marsh Stuart; Grebby Stephen; Mou Yi; Song Lijuan; Zhang Chenchen;

  • 作者单位

    Jiangsu Vocat Inst Architectural Technol Sch Architectural Construct Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol Minist Educ Key Lab Coalbed Methane Resource & Reservoir Form Xuzhou 221008 Jiangsu Peoples R China;

    Univ Nottingham Fac Engn Nottingham Geospatial Inst Nottingham NG7 2TU England;

    Univ Nottingham Fac Engn Nottingham Geospatial Inst Nottingham NG7 2TU England;

    Univ Nottingham Fac Engn Nottingham Geospatial Inst Nottingham NG7 2TU England;

    China Coal Res Inst Mine Safety Technol Branch Beijing 100013 Peoples R China|China Coal Res Inst State Key Lab Coal Min & Clean Utilizat Beijing 100013 Peoples R China;

    Jiangsu Vocat Inst Architectural Technol Sch Architectural Construct Xuzhou 221116 Jiangsu Peoples R China;

    Jiangsu Vocat Inst Architectural Technol Sch Architectural Construct Xuzhou 221116 Jiangsu Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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