页岩纳米孔隙表面分形特征及其影响因素

doi:10.11885/j.issn.1674-5086.2016.11.03.30

西南石油大学学报(自然科学版) ›› 2017, Vol. 39 ›› Issue (6): 85-91.DOI: 10.11885/j.issn.1674-5086.2016.11.03.30

页岩纳米孔隙表面分形特征及其影响因素

孙雷, 高玉琼, 潘毅, 欧成华

"油气藏地质及开发工程"国家重点实验室西南石油大学, 四川成都 610500

收稿日期:2016-11-03 出版日期:2017-12-01 发布日期:2017-12-01
通讯作者: 孙雷,E-mail:sunleiswpi@163.com
作者简介:孙雷,1954年生,男,汉族,辽宁辽阳人,教授,主要从事油气藏流体相态理论与测试、气田及凝析气田开发理论与应用、注气提高采收率原理及应用等研究工作。E-mail:sunleiswpi@163.com;高玉琼,1990年生,女,汉族,内蒙古集宁人,硕士研究生,主要从事油气田注气提高采收率方面的研究。E-mail:helen0527@126.com;潘毅,1981年生,男,汉族,四川仁寿人,讲师,博士,主要从事油气田开发方面的研究。E-mail:panyiswpu@126.com;欧成华,1971年生,男,汉族,四川剑阁人,副教授,博士,主要从事油气藏描述和剩余油气分布规律方面的研究。E-mail:chomm@163.com
基金资助:
国家“973”计划（2014CB239205）

Surface Fractal Characteristics and Their Influence on Shale Nanopores

SUN Lei, GAO Yuqiong, PAN Yi, OU Chenghua

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received:2016-11-03 Online:2017-12-01 Published:2017-12-01

摘要/Abstract

摘要： 明确页岩纳米孔隙表面分形特征有助于深化对页岩吸附机理与吸附模型的认识。以五峰组/龙马溪组、延长组页岩为研究对象，基于氮气吸附法孔隙结构参数，计算了页岩纳米孔隙表面分形维数，并与泥岩、致密砂岩分形维数对比，揭示了有机质、黏土矿物等对孔隙表面分形特征的影响。研究表明，五峰组/龙马溪组页岩纳米孔隙表面分维值为2.7~2.9，延长组页岩为2.3~2.7，其分维值取决于10 nm以下孔隙累计表面积大小；页岩分维值与有机质成熟演化阶段正相关，而与有机质含量关系复杂；有机质孔与黏土矿物晶间孔表面均具有明显的分形特征，该孔隙发育是页岩具有表面分形特征的根本性原因，但前者的分维值显著大于后者。有机质与黏土矿物表面呈现高度粗糙性，严重偏离光滑平整特性，因此，甲烷在页岩纳米孔内的吸附属于典型的非均匀固体上的吸附。

关键词: 分形表面, 纳米孔, 页岩, 有机质, 黏土矿物

Abstract: To further understand shale adsorption mechanism and adsorption model, the surface fractal characteristics of shale nanopores must be clarified. Using the shales from the Wufeng group/Longmaxi group and the Yanchang group as study objects, the surface fractal dimension of the shale nanopores was calculated based on the pore structure parameters obtained from the nitrogen adsorption method. It is then compared with the fractal dimension of mudstone and dense sandstone to reveal the effect of organic matter, clay mineral, and other factors on the fractal characteristics of the pore surface. The results show that the surface fractal dimension of shale nanopores in the Wufeng group/Longmaxi group varies between 2.7~2.9, and that for the Yanchang group shale varies between 2.3~2.7, and the fractal dimension depends on the cumulative surface area of pores below 10 nm. The value of the fractal dimensions of the shale has a positive correlation with the developmental stages of the maturation of organic matter. Its relation with organic matter content is however complicated. The surfaces of pores having organic matter and clay mineral crystal contents have obvious fractal characteristics. The development of these pores is the fundamental reason behind the shale having surface fractal characteristics; however, the fractal dimension value of the former is significantly greater than that of the latter. The surface of organic matter and clay minerals is highly rough and seriously deviates from smoothness. Therefore, the adsorption of methane in shale nanopores is a typical heterogeneous solid adsorption process.

Key words: fractal surface, nanopore, shale, organic matter, clay mineral

中图分类号:

TE31

孙雷, 高玉琼, 潘毅, 欧成华. 页岩纳米孔隙表面分形特征及其影响因素[J]. 西南石油大学学报(自然科学版), 2017, 39(6): 85-91.

SUN Lei, GAO Yuqiong, PAN Yi, OU Chenghua. Surface Fractal Characteristics and Their Influence on Shale Nanopores[J]. 西南石油大学学报(自然科学版), 2017, 39(6): 85-91.

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页岩纳米孔隙表面分形特征及其影响因素

Surface Fractal Characteristics and Their Influence on Shale Nanopores

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