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剪切作用对页岩有机质孔发育特征和吸附能力的影响

俞雨溪 王宗秀 冯兴强 张凯逊 张林炎

俞雨溪, 王宗秀, 冯兴强, 等, 2020. 剪切作用对页岩有机质孔发育特征和吸附能力的影响. 地质力学学报, 26 (6): 830-839. DOI: 10.12090/j.issn.1006-6616.2020.26.06.065
引用本文: 俞雨溪, 王宗秀, 冯兴强, 等, 2020. 剪切作用对页岩有机质孔发育特征和吸附能力的影响. 地质力学学报, 26 (6): 830-839. DOI: 10.12090/j.issn.1006-6616.2020.26.06.065
YU Yuxi, WANG Zongxiu, FENG Xingqiang, et al., 2020. Effect of shear on the development and adsorption capacity of organic pores in shale. Journal of Geomechanics, 26 (6): 830-839. DOI: 10.12090/j.issn.1006-6616.2020.26.06.065
Citation: YU Yuxi, WANG Zongxiu, FENG Xingqiang, et al., 2020. Effect of shear on the development and adsorption capacity of organic pores in shale. Journal of Geomechanics, 26 (6): 830-839. DOI: 10.12090/j.issn.1006-6616.2020.26.06.065

剪切作用对页岩有机质孔发育特征和吸附能力的影响

doi: 10.12090/j.issn.1006-6616.2020.26.06.065
基金项目: 

国家自然科学基金 41802178

中国地质科学院基本科研业务费项目 JYYWF20181201

中国地质调查局地质调查项目 DD20190085

详细信息
    作者简介:

    俞雨溪(1987-), 女, 博士, 从事页岩储层微观结构表征和页岩油气成藏机理研究。E-mail:yuyuxi718@126.com

    通讯作者:

    王宗秀(1959-), 男, 博士, 研究员, 从事造山带、构造变形、区域地质研究工作。E-mail:wangzongxiu@sohu.com

  • 中图分类号: P618.13

Effect of shear on the development and adsorption capacity of organic pores in shale

  • 摘要: 有机质孔是高成熟页岩储层中吸附气和游离气赋存的主要储集空间类型。中国南方海相页岩地层经历了多期构造改造,滑脱构造广泛发育。为了认识剪切作用对页岩有机质孔微观结构和吸附能力的影响,以张家界三岔地区下寒武统牛蹄塘组页岩为例,通过大量扫描电镜图像观测统计,对比分析了滑脱带页岩、邻近滑脱带页岩和远离滑脱带页岩有机质孔的发育特征,同时对这三类样品进行了甲烷等温吸附测试。研究结果表明,有机质内孔发育在有机质内部,孔径一般<20 nm;位于有机质与矿物接触边缘的复合孔孔径整体大于有机质内孔,主要发育在滑脱带页岩中包裹有矿物碎片的有机质中。受剪切作用影响,这两类有机质孔均沿一定优势方向发生形变,形态更趋于狭长且定向性增强;同时页岩甲烷吸附能力变差,从滑脱带向远离滑脱带方向这种影响逐渐减弱。剪切作用对页岩储集性能和含气性具有重要控制作用,对认识复杂构造区页岩气保存条件和富集规律具有重要意义。

     

  • 图  1  牛蹄塘组三岔剖面区域构造位置和页岩地层发育特征

    a—牛蹄塘组三岔剖面区域构造位置;b—页岩地层发育特征

    Figure  1.  Regional structural location of the Sancha shale outcrop of the Niutitang Formation (Fig. 1a) and its characteristics (Fig. 1b)

    图  2  孔径、长宽比、长轴方向参数的定义及测量方法

    Figure  2.  Definitions and measurement methods of parameters (pore size, LW ratio, major axis direction)

    图  3  页岩孔隙类型扫描电镜图像

    a—c—SC3样品;d、f—SC1样品;e—SC2样品

    Figure  3.  SEM images of pore types in shale

    图  4  有机质孔孔径和长宽比参数统计结果

    a、b—有机质内孔;c、d—有机质-矿物复合孔

    Figure  4.  Statistical results of pore size distribution (Fig. 3a and 3c) and LW ratio (Fig. 3b and 3d)

    图  5  有机质内孔和有机质-矿物复合孔孔隙长轴方向分布玫瑰花图

    a-c-有机质内孔;d-f -有机质-矿物复合孔; a、d-SC1样品;b、e-SC2样品;c、f-SC3样品;水平方向为页岩层理方向

    Figure  5.  Rose diagram showing the major axis directions of organic matter hosted pores (Fig. 4a, 4c and 4e) and organic matter-mineral related pores (Fig. 4b, 4d and 4f)

    图  6  二氧化碳吸附测试微孔范围孔径分布结果

    Figure  6.  Distribution diagram of micropore sizes based on the CO2 adsorption test

    图  7  甲烷等温吸附测试结果(30 ℃)

    Figure  7.  Methane isothermal adsorption results at 30 ℃

    图  8  页岩有机质孔微观剪切变形模式

    a-变形前;b-剪切变形后

    Figure  8.  Microscopic deformation pattern of shale organic pore under shear

    表  1  样品位置、类型及其总有机碳含量和矿物组成

    Table  1.   Positions and types of samples and their TOC wt%

    样号 样品类型 与滑脱带顶面距离/m TOC/% 石英/% 粘土矿物/% 碳酸盐矿物/% 其他矿物/%
    SC1 滑脱带 / 7.72 52 36 5 7
    SC2 邻近滑脱带 0.4 7.05 54 28 8 10
    SC3 远离滑脱带 1.5 8.29 50 30 15 5
    下载: 导出CSV

    表  2  页岩有机质孔形态学参数统计结果

    Table  2.   Statistical results of morphological parameters of organic pores in shale

    样号 样品类型 有机质内孔 有机质-矿物复合孔
    中值孔径/nm 中值长宽比 中值孔径/nm 中值长宽比
    SC1 滑脱带 14.2 1.92 23.0 2.38
    SC2 邻近滑脱带 16.5 1.79 20.1 2.11
    SC3 远离滑脱带 18.3 1.63 18.6 2.01
    下载: 导出CSV
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  • 收稿日期:  2020-08-20
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