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准噶尔盆地沙湾凹陷东部原油地球化学特征和来源

吴小奇 任新成 刘德志 陈迎宾 穆玉庆 王斌 商丰凯 孙中良 曲彦胜 宋振响 邱岐

吴小奇, 任新成, 刘德志, 陈迎宾, 穆玉庆, 王斌, 商丰凯, 孙中良, 曲彦胜, 宋振响, 邱岐. 准噶尔盆地沙湾凹陷东部原油地球化学特征和来源[J]. 石油实验地质, 2023, 45(4): 646-655. doi: 10.11781/sysydz202304646
引用本文: 吴小奇, 任新成, 刘德志, 陈迎宾, 穆玉庆, 王斌, 商丰凯, 孙中良, 曲彦胜, 宋振响, 邱岐. 准噶尔盆地沙湾凹陷东部原油地球化学特征和来源[J]. 石油实验地质, 2023, 45(4): 646-655. doi: 10.11781/sysydz202304646
WU Xiaoqi, REN Xincheng, LIU Dezhi, CHEN Yingbin, MU Yuqing, WANG Bin, SHANG Fengkai, SUN Zhongliang, QU Yansheng, SONG Zhenxiang, QIU Qi. Geochemical characteristics and source of crude oil from the eastern Shawan Sag, Junggar Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(4): 646-655. doi: 10.11781/sysydz202304646
Citation: WU Xiaoqi, REN Xincheng, LIU Dezhi, CHEN Yingbin, MU Yuqing, WANG Bin, SHANG Fengkai, SUN Zhongliang, QU Yansheng, SONG Zhenxiang, QIU Qi. Geochemical characteristics and source of crude oil from the eastern Shawan Sag, Junggar Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(4): 646-655. doi: 10.11781/sysydz202304646

准噶尔盆地沙湾凹陷东部原油地球化学特征和来源

doi: 10.11781/sysydz202304646
基金项目: 

国家自然科学基金项目 42172149

国家自然科学基金项目 U2244209

中国石化科技部项目 P21077-1

中国石化科技部项目 P22132

详细信息
    作者简介:

    吴小奇(1982—),男,博士,高级工程师,本刊青年编委,从事油气成藏地球化学研究。E-mail: xqwu@163.com

  • 中图分类号: TE122.1

Geochemical characteristics and source of crude oil from the eastern Shawan Sag, Junggar Basin

  • 摘要: 沙湾凹陷是准噶尔盆地腹部重要的勘探领域之一,为了更好地厘清凹陷内二叠系、侏罗系和白垩系储层中原油的来源,明确油气成藏过程和富集规律,对该凹陷东部典型井原油样品开展了碳同位素和生物标志化合物分析,并基于对原油地球化学特征的分析,开展了原油分类和油源对比。沙湾凹陷东部不同层系原油可以分为3类:第一类原油赋存于二叠系及侏罗系储层中,其全油δ13C值和Pr/Ph比值分别介于-31.0‰~-29.0‰和1.0~2.0,αααR规则甾烷相对含量具有C27<C28<C29的特征,萜烷类多数表现出C20<C21>C23TT、C24TeT/C26TT<1的特征,且伽马蜡烷指数均小于0.30,这类原油主体来自中二叠统下乌尔禾组烃源岩,其中上二叠统上乌尔禾组油样中未检出Ts,β-胡萝卜烷/C30藿烷比值大于1,三环萜烷分布表现出C20>C21>C23TT的特征,且甲基菲分布分数反映了原油处于高成熟演化阶段,这表明其中混入了少量下二叠统烃源岩生成的原油;第二类原油赋存于中侏罗统储层中,其典型特征为全油δ13C值及正构烷烃单体δ13C值主体大于-29.0‰,Pr/Ph比值相对较高,介于2.0~2.5,且C24TeT/C26TT比值大于1,表明这类原油主体为侏罗系烃源岩生成;第三类原油赋存于下白垩统储层中,其全油δ13C值和Pr/Ph比值分别小于-31.0‰和1.0,αααR规则甾烷含量呈C27≈C28<C29特征,伽马蜡烷指数均高于0.50,正构烷烃单体δ13C值随碳数升高而逐渐降低,且主体小于-31‰,表明这类原油主要来自下白垩统烃源岩。

     

  • 图  1  准噶尔盆地腹部沙湾凹陷东部位置(a)及井位分布(b)

    Figure  1.  Location (a) and well distribution (b) of the eastern Shawan Sag in the hinterland of the Junggar Basin

    图  2  准噶尔盆地沙湾凹陷东部原油Pr/Ph与δ13C相关图

    底图据陈建平等[25]

    Figure  2.  Correlation between Pr/Ph and δ13C of crude oil from the eastern Shawan Sag, the Junggar Basin

    图  3  准噶尔盆地沙湾凹陷东部原油饱和烃气相色谱图

    Figure  3.  Gas chromatogram of saturated hydrocarbon in crude oil from the eastern Shawan Sag, the Junggar Basin

    图  4  准噶尔盆地沙湾凹陷东部原油Pr/nC17与Ph/nC18相关图

    Figure  4.  Correlation between Pr/nC17 and Ph/nC18 of crude oil from the eastern Shawan Sag, the Junggar Basin

    图  5  准噶尔盆地沙湾凹陷东部原油甾烷(m/z 217)和萜烷(m/z 191)质量色谱图

    Figure  5.  Mass chromatogram of sterane (m/z 217) and terpane (m/z 191) of crude oil from the eastern Shawan Sag, the Junggar Basin

    图  6  准噶尔盆地沙湾凹陷东部原油F1F2相关图

    底图据包建平等[34]

    Figure  6.  Correlation between F1 and F2 of crude oil from the eastern Shawan Sag, the Junggar Basin

    图  7  准噶尔盆地沙湾凹陷东部原油DBT/Phen(a)和MDBTs/MDBFs(b)与Pr/Ph相关图

    底图分别据HUGHES等[35]和RADKE等[36]

    Figure  7.  Correlation diagram of DBT/Phen (a) and MDBTs/MDBFs (b) vs. Pr/Ph of crude oil from the eastern Shawan Sag, the Junggar Basin

    图  8  准噶尔盆地沙湾凹陷东部二叠系(a)和白垩系(b)烃源岩抽提物及对应原油正构烷烃单体碳同位素值分布

    金探1井P2w和风南1井P1f烃源岩据李二庭等[9];阿尔钦沟K1q烃源岩据陈建平等[23]

    Figure  8.  Distribution of carbon isotopic values of individual n-alkanes in the Permian (a) and Cretaceous (b) source rock extracts and crude oil from the eastern Shawan Sag, the Junggar Basin

    表  1  准噶尔盆地沙湾凹陷东部原油生物标志化合物及全油碳同位素组成特征

    Table  1.   Biomarker and whole oil carbon isotope composition characteristics of crude oil from the eastern Shawan Sag, the Junggar Basin

    井号 深度/m 层位 主峰碳 OEP CPI Pr/Ph Pr/nC17 Ph/nC18 Ts/Tm αααC27 /% αααC28/% αααC29/% C29 ααα20S/(20S+20R) C29 αββ/(αββ+ααα)
    Y2 6 051~6 061 J2x C17 1.01 1.13 2.17 0.25 0.12 0.91 9.5 29.6 60.9 0.50 0.52
    Y3 5 801~5 845 J1s C19 1.16 1.16 1.27 0.59 0.50 0.68 12.8 39.0 48.2 0.49 0.55
    Y6 6 026~6 038 J2x C18 1.00 1.12 1.77 0.29 0.16 0.76 12.5 39.1 48.4 0.49 0.50
    Y6 5 858~5 870 K1Tg C15 1.12 1.04 0.68 0.64 1.04 0.93 23.9 24.6 51.5 0.45 0.44
    Y6 5 914~5 918 K1Tg C15 1.08 1.03 0.68 0.65 1.05 0.98 21.8 24.3 53.9 0.46 0.46
    Z10 7 596~7 655 P3w C17 1.03 1.15 1.40 0.25 0.19 - - 45.2 54.8 0.48 0.51
    Z6 5 121~5 132 J1s C17 1.01 1.14 1.64 0.36 0.23 0.67 12.8 33.1 54.1 0.47 0.51
    H11 3 049~3 931 P1f C17 1.21 1.12 0.64 1.10 2.12 - 4.2 38.6 57.2 0.46 0.29
    井号 C19/C20TT C20/C21TT C21/C23TT C24TeT/C26TT Ga/C30H C35S/C34S C35H/C31-35H β-胡萝卜烷/C30H 9-MP/1-MP F1 F2 DBT/Phen MDBTs/MDBFs δ13C/‰
    Y2 1.05 1.49 1.14 1.43 0.08 0.47 0.032 - 1.42 0.54 0.28 0.08 0.77 -27.3
    Y3 0.28 0.90 1.36 0.51 0.18 0.44 0.033 1.56 1.48 0.50 0.28 0.06 0.33 -30.4
    Y6 0.21 0.72 1.26 0.45 0.30 0.55 0.046 0.61 1.46 0.50 0.27 0.08 0.79 -29.7
    Y6 0.35 0.63 1.06 0.53 0.69 0.44 0.041 0.80 1.14 0.44 0.25 0.02 0.41 -31.5
    Y6 0.30 0.71 1.01 0.66 0.76 0.47 0.040 0.78 1.14 0.44 0.25 0.02 0.55 -31.3
    Z10 - 1.21 1.03 0.12 - - - 8.27 1.12 0.76 0.45 - - -30.2
    Z6 0.32 0.77 1.19 0.65 0.23 0.45 0.025 0.66 1.67 0.40 0.20 0.16 0.50 -29.4
    H11 0.19 0.71 0.66 0.85 0.24 0.56 0.037 1.28 1.18 0.60 0.33 - - -30.4
    注:F1F2分别为(2-MP+3-MP)/(1-MP+2-MP+3-MP+9-MP)和2-MP/(1-MP+2-MP+3-MP+9-MP)。
    下载: 导出CSV

    表  2  准噶尔盆地沙湾凹陷东部不同类型原油及西北缘原油地化特征综合对比

    Table  2.   Comprehensive comparison of different types of crude oil from the eastern Shawan Sag and the crude oil from the northwestern margin of the Junggar Basin

    地化特征 沙湾凹陷原油分类 西北缘原油
    Ⅰ类 Ⅱ类 Ⅲ类
    储层 P3w, J1s, J2x J2x K1Tg P1f
    全油δ13C/‰ -31.0~-29.0 >-29.0 <-31.0 <-29.0
    Pr/Ph 1.0~2.0 2.0~2.5 <1.0 <1.0
    Pr/nC17 <1.0 <1.0 <1.0 >1.0
    Ph/nC18 <1.0 ≈1.0 <1.0 >1.0
    αααR规则甾烷 C27<C28<C29 C27<C28<C29 C27≈C28<C29 C27<C28<C29
    β-胡萝卜烷/C30H <1.0, 少部分>1.0 ≈0 <1.0 >1.0
    三环萜烷分布 C20 <C21>C23TT C20>C21>C23TT C20 <C21≈C23TT C20<C21<C23TT
    C24TeT/C26TT <1.0 >1.0 <1.0 <1.0
    Ts/Tm <1.0 <1.0 0.93~0.98 <0.2
    Ga/C30H <0.3 <0.1 0.69~0.76 >0.3
    正构烷烃单体δ13C分布 先降低后升高 逐渐降低 先升高后降低
    油源 P2w,部分P1 J1-2 K1 P1f
    下载: 导出CSV
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  • 收稿日期:  2023-04-11
  • 修回日期:  2023-06-02
  • 刊出日期:  2023-07-28

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