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湘西北地区下寒武统牛蹄塘组页岩有机地球化学与矿物组成特征

郭永岩 梁明亮 王宗秀 张林炎 李会军 李小诗

郭永岩, 梁明亮, 王宗秀, 等, 2019. 湘西北地区下寒武统牛蹄塘组页岩有机地球化学与矿物组成特征. 地质力学学报, 25 (3): 392-399. DOI: 10.12090/j.issn.1006-6616.2019.25.03.036
引用本文: 郭永岩, 梁明亮, 王宗秀, 等, 2019. 湘西北地区下寒武统牛蹄塘组页岩有机地球化学与矿物组成特征. 地质力学学报, 25 (3): 392-399. DOI: 10.12090/j.issn.1006-6616.2019.25.03.036
GUO Yongyan, LIANG Mingliang, WANG Zongxiu, et al., 2019. ORGANIC GEOCHEMISTRY AND MINERAL COMPOSITION CHARACTERISTICS IN SHALES OF NIUTITANG FORMATION, NORTHWESTERN HUNAN. Journal of Geomechanics, 25 (3): 392-399. DOI: 10.12090/j.issn.1006-6616.2019.25.03.036
Citation: GUO Yongyan, LIANG Mingliang, WANG Zongxiu, et al., 2019. ORGANIC GEOCHEMISTRY AND MINERAL COMPOSITION CHARACTERISTICS IN SHALES OF NIUTITANG FORMATION, NORTHWESTERN HUNAN. Journal of Geomechanics, 25 (3): 392-399. DOI: 10.12090/j.issn.1006-6616.2019.25.03.036

湘西北地区下寒武统牛蹄塘组页岩有机地球化学与矿物组成特征

doi: 10.12090/j.issn.1006-6616.2019.25.03.036
基金项目: 

国家自然科学基金 41672201

中国地质调查局地质调查专项 121201104000150006

详细信息
    作者简介:

    郭永岩(1991-), 女, 在读硕士, 地质工程专业。E-mail:y1490532451@163.com

    通讯作者:

    王宗秀(1959-), 男, 教授, 从事能源地质学方面的研究。E-mail:wangzongxiu@sohu.com

  • 中图分类号: P618.13

ORGANIC GEOCHEMISTRY AND MINERAL COMPOSITION CHARACTERISTICS IN SHALES OF NIUTITANG FORMATION, NORTHWESTERN HUNAN

  • 摘要: 文章以湘西北地区下寒武统牛蹄塘组页岩为研究对象,分析其有机地球化学及无机矿物特征,重点对其烃源岩生物标志化合物特征进行分析。结果表明:该套页岩残余有机碳(TOC)含量高、氯仿沥青"A"含量低、生烃潜量"S1+S2"较小,镜质组反射率Ro在2.3%~3.19%之间,达到了过成熟阶段,以生成干气为主。分子生物标志化合物结果显示正构烷烃呈双峰型,碳数大于C22的中-高碳数烃占优势;Pr/Ph平均值为0.31,植烷优势明显,指示强还原的海相沉积环境;萜烷丰度顺序为五环三萜烷>三环萜烷>四环萜烷,γ-环蜡烷与C30霍烷的比值普遍大于0.3,指示其沉积母质以浮游生物及海洋性自养菌为主,含有部分藻类;Ts/(Ts+Tm)在0.35~0.38之间,与镜质组反射率对成熟度的检测结果相互印证;规则甾烷C27 > C29 > C28,指示其母质来源以浅海生物来源为主,所有样品中均检测出孕甾烷、升孕甾烷、重排甾烷及4-甲基甾烷,表明其经历过微生物降解作用。全岩矿物组分分析显示该套页岩具备较好的开发物性条件和较强的吸附性能。综合以上分析结果,提出研究区牛蹄塘组页岩具备较好的页岩气成烃成藏的物质条件,并为该区深入开展页岩气勘探目标区优选奠定了很好的工作基础。

     

  • 图  1  采样位置图(据参考文献[9]修改)

    1—扬子准地台;Ⅰ2—华南褶皱带;Ⅱ1—八面山褶皱带;Ⅱ2—江南地轴;Ⅲ1—鹤峰复背斜;Ⅲ2—桑植复向斜;Ⅲ3—临湘复向斜;Ⅲ4—古丈隆起;Ⅲ5—沅麻盆地;Ⅲ6—新晃隆起;Ⅲ7—洪江隆起;Ⅲ8—黔滁鞍部构造;Ⅲ9—冷家溪隆起;Ⅲ10—洞庭坳陷;Ⅲ11—幕阜山隆起;Ⅲ12—宁乡凹陷

    Figure  1.  Sample location map (modified after reference [9])

    图  2  样品饱和烃质量色谱图(m/z 85)

    Figure  2.  The mass chromatogram (m/z 85) of saturated hydrocarbon of samples

    图  3  样品Pr/C17与Ph/C18关系图

    Figure  3.  The crossplot of Pr/C17 and Ph/C18 of shale samples

    图  4  样品饱和烃质量色谱图(m/z 191)

    Figure  4.  The mass chromatogram (m/z 191) of saturated hydrocarbon of samples

    图  5  样品饱和烃质量色谱图(m/z 217)

    Figure  5.  The mass chromatogram (m/z 217) of saturated hydrocarbon of samples

    图  6  样品矿物组成柱状简图

    Figure  6.  The mineral composition content of samples

    表  1  湘西北牛蹄塘组页岩有机质组成特征

    Table  1.   Characteristics of shale organic matter composition of Niutitang Formation in northwestern Hunan

    采样点 样品编号 TOC/% Rb/% Ro/% S1+S2/(mg/g) 氯仿沥青“A”/% 饱和烃/芳烃
    张家界田旦峪村 15-264-1 0.43 3.96 2.85 0.06 0.0021 10.00
    15-264-2 3.46 / / 0.21 0.0026 11.01
    15-264-3 0.29 3.48 2.55 0.04 0.0022 2.67
    15-264-4 0.37 3.58 2.61 0.07 0.002 5.99
    15-264-5 1.24 3.58 2.61 0.16 0.0019 3.00
    怀化 15-279-1 2.06 3.07 2.30 0.13 0.0383 4.43
    花垣排吾乡 NF15-222-1 1.18 4.32 3.07 0.05 0.0027 6.00
    NF15-222-2 9.75 4.51 3.19 0.06 0.002 4.00
    益阳泥江口镇 NF15-01-1 2.48 / / 0.06 0.0024 1.60
    NF15-01-2 3.53 / / 0.06 0.0032 6.50
    NF15-01-3 10.17 / / 0.04 0.0018 1.75
    NF15-01-4 15.69 / / 0.04 0.0024 7.00
    NF15-01-5 12.76 / / 0.05 0.0021 4.33
    NF15-01-9 0.33 / / 0.13 0.0034 8.00
    下载: 导出CSV

    表  2  页岩样品正构烷烃及类异戊二烯烃参数

    Table  2.   Parameters of n-alkanes and isoprenoid of shale samples

    样品编号 主峰碳 Pr/Ph Pr/nC17 Ph/nC18 ∑C21-/∑C22+
    15-264-1 C18/C25 0.32 0.54 1.21 0.37
    15-264-2 C18/C25 0.3 0.54 1.19 0.32
    15-264-3 C18/C25 0.42 0.58 1.15 0.65
    15-264-4 C18/C25 0.33 0.57 1.28 0.34
    15-264-5 C18/C25 0.24 0.58 1.23 0.71
    15-279-1 C18/C24 0.11 0.62 1.17 0.73
    NF15-01-1 C18/C25 0.3 0.64 1.39 0.39
    NF15-01-2 C18/C23 0.32 0.71 1.54 0.63
    NF15-01-3 C18/C23 0.33 0.71 1.59 0.38
    NF15-01-4 C18/C24 0.38 0.71 1.37 0.82
    NF15-01-5 C18/C23 0.33 0.84 1.87 0.66
    NF15-01-9 C18/C24 0.27 0.53 1.05 0.47
    NF15-222-1 C18/C25 0.32 0.58 1.33 0.32
    NF15-222-2 C18/C25 0.34 0.7 1.39 0.34
    下载: 导出CSV

    表  3  页岩样品萜类和甾类化合物参数

    Table  3.   Parameters of terpane and sterane of shale samples

    样品编号 萜烷 甾烷
    Ts/(Ts+Tm) γ/C30H C3122S/(S+R) C3222S/(S+R) C29ββ/(αα+ββ) C2920S/(S+R) 相对含量/%
    C27 C28 C29
    15-264-1 0.36 0.34 0.6 0.58 0.63 0.44 36.89 29.56 33.55
    15-264-2 0.37 0.3 0.61 0.58 0.62 0.47 37.64 30.38 31.98
    15-264-3 0.37 0.31 0.61 0.58 0.63 0.45 39.15 28.68 32.17
    15-264-4 0.35 0.29 0.62 0.58 0.60 0.47 35.46 32.17 32.37
    15-264-5 0.38 0.29 0.62 0.58 0.61 0.45 35.93 30.51 33.56
    15-279-1 0.36 0.31 0.61 0.58 0.63 0.44 38.36 28.82 32.82
    NF15-01-1 0.35 0.31 0.61 0.58 0.61 0.46 38.38 30.01 31.61
    NF15-01-2 0.36 0.29 0.61 0.58 0.61 0.47 38.6 30.22 31.18
    NF15-01-3 0.36 0.3 0.61 0.58 0.61 0.47 36.58 31.38 32.04
    NF15-01-4 0.36 0.31 0.61 0.58 0.62 0.44 38.98 28.57 32.45
    NF15-01-5 0.36 0.3 0.61 0.58 0.62 0.45 38.51 28.96 32.53
    NF15-01-9 0.36 0.31 0.61 0.58 0.61 0.46 37.57 29.89 32.54
    NF15-222-1 0.35 0.35 0.6 0.58 0.61 0.47 36.91 31.09 32
    NF15-222-2 0.35 0.34 0.6 0.58 0.62 0.45 36.5 30.55 32.95
    下载: 导出CSV
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    LI Xinjing, HU Suyun, CHENG Keming. Suggestions from the development of fractured shale gas in North America[J]. Petroleum Exploration and Development, 2007, 34(4):392-400. (in Chinese with English abstract) doi: 10.3321/j.issn:1000-0747.2007.04.002
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出版历程
  • 收稿日期:  2018-01-20
  • 修回日期:  2018-11-02
  • 刊出日期:  2019-06-01

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