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南华北盆地偃龙地区二叠系泥页岩微观孔隙特征及其影响因素分析

陈静 吴伟 王娟 黄雪峰

陈静, 吴伟, 王娟, 等, 2017. 南华北盆地偃龙地区二叠系泥页岩微观孔隙特征及其影响因素分析. 地质力学学报, 23 (6): 829-837.
引用本文: 陈静, 吴伟, 王娟, 等, 2017. 南华北盆地偃龙地区二叠系泥页岩微观孔隙特征及其影响因素分析. 地质力学学报, 23 (6): 829-837.
CHEN Jing, WU Wei, WANG Juan, et al., 2017. MICROSCOPIC PORE CHARACTERISTICS AND INFLUENCE FACTORS ANALYSIS OF SHALES IN PERMIAN, YANLONG AREA, SOUTHERN NORTH CHINA BASIN. Journal of Geomechanics, 23 (6): 829-837.
Citation: CHEN Jing, WU Wei, WANG Juan, et al., 2017. MICROSCOPIC PORE CHARACTERISTICS AND INFLUENCE FACTORS ANALYSIS OF SHALES IN PERMIAN, YANLONG AREA, SOUTHERN NORTH CHINA BASIN. Journal of Geomechanics, 23 (6): 829-837.

南华北盆地偃龙地区二叠系泥页岩微观孔隙特征及其影响因素分析

基金项目: 

国家自然科学基金 41102059

河南省高校科技创新团队支持计划 17IRTSTHN025

详细信息
    作者简介:

    陈静(1991-), 女, 硕士生, 从事油气地质, 含油气盆地分析等研究方向。E-mail:18300600609@163.com

    通讯作者:

    吴伟(1979-), 男, 博士, 副教授, 从事沉积盆地分析与油气勘探研究。E-mail:wei@hpu.edu.cn

  • 中图分类号: P618.13

MICROSCOPIC PORE CHARACTERISTICS AND INFLUENCE FACTORS ANALYSIS OF SHALES IN PERMIAN, YANLONG AREA, SOUTHERN NORTH CHINA BASIN

  • 摘要: 运用氩离子抛光—场发射环境扫描电子显微成像测试技术,对南华北盆地偃龙地区ZK1614井二叠系海陆交互相—陆相的泥页岩样品进行观察并获取二次电子及背散射信息。结合X射线能谱信息和JMicroVision软件灰度识别功能,对样品矿物组成及微观孔隙特征进行定性分析和定量表征,并探讨了孔隙发育分布的影响因素。研究发现:样品主要发育的孔隙以无机矿物孔为主,孔隙类型有粒内孔、粒间孔、少量有机质孔及微裂隙;样品面孔率介于0.92%~5.53%之间,整体来看,面孔率大小与孔隙数量正相关;孔径大小介于50~2000 nm间,不同区段的孔面积对数指标与单位面积孔数量对数指标呈两段式线性关系,孔径较小时两者负相关,孔径较大时两者正相关。不同矿物对孔隙的发育有不同的控制作用,脆性矿物主要影响裂隙的发育,对孔隙的发育有一定的抑制作用;粘土矿物因构造应力、矿物相变及脱水等作用形成大量孔隙,对孔隙的发育起一定的促进作用。研究区燕山期、喜山期因构造活动形成了大量尺度较大的裂隙,裂隙的发育使岩层的渗流性能增加,促进了有机酸和地层水对矿物的溶蚀作用,相应的促进了孔隙的发育。此外,随着埋藏深度的增加,孔隙体积随着压实作用的增大而逐渐减小。

     

  • 图  1  南华北盆地构造单元划分及ZK1614井位图

    Figure  1.  Division of tectonic units of the southern North China Basin and the location of the Well ZK1614

    图  2  微观孔隙形态及类型

    Qz-石英;Cal-方解石;Pyr-英铁矿;Mu-云母;Ant-锐钛矿;Clay-粘土矿物;OM-有机质

    Figure  2.  Morphology and type of microscopic pores

    图  3  泥页岩样品不同孔径孔隙的频率、面孔率及相关性

    Figure  3.  Frequency, face porosity and correlation of different pore sizes in shale samples

    图  4  不同矿物与面孔率关系图

    Figure  4.  Relationship between different minerals and face porosities

    图  5  TOC和面孔率关系图

    Figure  5.  Relationship between TOC and face porosity

    表  1  样品地球化学测试数据

    Table  1.   Geochemical data of shale samples

    样品编号 岩性 TOC/% Ro/% S1+S2/(mg/g) Tmax/℃
    TY5 泥页岩 1.42 4.22 0.03 478
    TY9 泥页岩 5.34 4.34 0.06 477
    SX15 泥页岩 1.61 4.43 0.04 488
    SX19 泥页岩 0.16 4.49 0.03 487
    SX24 泥页岩 0.18 4.29 0.02 376
    XSHZ35 泥页岩 1.21 4.6 0.04 473
    XSHZ44 泥页岩 0.15 4.64 0.03 366
    SSHZ54 泥页岩 0.21 0.02 446
    注:“TOC”表示有机碳含量;“Ro”表示镜质体反射率;“S1+S2”表示生烃潜量;“Tmax”表示最高热解峰温;“—”表示无测试数据
    下载: 导出CSV

    表  2  泥页岩样品孔隙特征参数统计表

    Table  2.   Parametric statistical table of pore characteristics of shale samples

    样品编号 孔数量/个 总孔面积
    ×107/nm2
    平均孔面积
    ×104/nm2
    面孔率/% D1 C1 D2 C2 dtran/nm
    TY5 10294 52.25 5.08 0.92 1.9 -21.34 -10.45 71.29 200~250
    TY9 31623 259.17 8.20 4.59 2.65 -27.32 -4.03 26.53 200~250
    SX15 10433 56.16 5.38 0.99 2.93 -28.43
    SX19 18404 179.11 9.73 3.17 2.4 -25.62 -1.7 7.3 350~400
    SX24 23850 170.73 7.16 3.02 3.03 -30.41 -7.51 52.46 250~300
    XSHZ35 31610 312.50 9.89 5.53 2.94 -30.33 -3.07 18.72 350~400
    XSHZ44 16811 71.64 4.26 1.27 2.18 -23.3 -4.07 25.61 150~200
    SSHZ54 21267 161.02 7.57 2.85 2.96 -29.78 -5 32.95 250~300
    注:“D”表示关系函数斜率;“C”表示关系函数截距;“dtran”表示过渡点孔径区间;“—”表示无测试数据
    下载: 导出CSV

    表  3  泥页岩样品矿物组成

    Table  3.   Main mineral composition in shale samples

    样品编号 脆性矿物/%
    (石英+长石)
    碳酸盐岩/%
    (方解石+白云石)
    黄铁矿
    /%
    粘土矿物
    /%
    TY5 22.32 15.42 10.82 48.44
    TY9 35.18 13.03 10.73 49.06
    SX15 46.42 10.84 8.36 34.38
    SX19 29.78 36.24 1.62 40.36
    SX24 33.72 11.15 1.27 53.86
    XSHZ35 21.23 8.09 1.04 69.64
    XSHZ44 37.36 4.70 1.21 50.73
    SSHZ54 32.60 11.22 0.87 55.31
    下载: 导出CSV
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  • 收稿日期:  2017-03-31
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