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羌塘盆地东部三叠系阿堵拉组烃源岩古沉积环境的地球化学证据

刘栩 刘中戎 庄新兵 范志伟 马泽良 彭金宁 李风勋 李吉鹏 李兴强

刘栩, 刘中戎, 庄新兵, 范志伟, 马泽良, 彭金宁, 李风勋, 李吉鹏, 李兴强. 羌塘盆地东部三叠系阿堵拉组烃源岩古沉积环境的地球化学证据[J]. 石油实验地质, 2024, 46(3): 601-613. doi: 10.11781/sysydz202403601
引用本文: 刘栩, 刘中戎, 庄新兵, 范志伟, 马泽良, 彭金宁, 李风勋, 李吉鹏, 李兴强. 羌塘盆地东部三叠系阿堵拉组烃源岩古沉积环境的地球化学证据[J]. 石油实验地质, 2024, 46(3): 601-613. doi: 10.11781/sysydz202403601
LIU Xu, LIU Zhongrong, ZHUANG Xinbing, FAN Zhiwei, MA Zeliang, PENG Jinning, LI Fengxun, LI Jipeng, LI Xingqiang. Geochemical evidence of paleo-depositional environment of Triassic Adula Formation source rocks of eastern Qiangtang Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(3): 601-613. doi: 10.11781/sysydz202403601
Citation: LIU Xu, LIU Zhongrong, ZHUANG Xinbing, FAN Zhiwei, MA Zeliang, PENG Jinning, LI Fengxun, LI Jipeng, LI Xingqiang. Geochemical evidence of paleo-depositional environment of Triassic Adula Formation source rocks of eastern Qiangtang Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(3): 601-613. doi: 10.11781/sysydz202403601

羌塘盆地东部三叠系阿堵拉组烃源岩古沉积环境的地球化学证据

doi: 10.11781/sysydz202403601
基金项目: 

中国石化科技攻关项目 P22197

中国石化科技攻关项目 P22198

详细信息
    作者简介:

    刘栩(1996—),男,硕士,从事烃源岩评价研究。E-mail: liux96.syky@sinopec.com

  • 中图分类号: TE121.1

Geochemical evidence of paleo-depositional environment of Triassic Adula Formation source rocks of eastern Qiangtang Basin

  • 摘要: 上三叠统阿堵拉组泥岩是羌塘盆地重要烃源岩系之一,目前对其古沉积环境的认识存在较大争议。通过对羌塘盆地东部雀莫错地区鄂尔托陇巴剖面阿堵拉组开展岩石学、有机地球化学和元素地球化学分析等系统研究,探讨阿堵拉组烃源岩古沉积环境及其对烃源岩发育的影响。阿堵拉组泥岩总有机碳(TOC)含量为0.27%~3.46%,平均为1.60%,总体为好烃源岩,局部发育优质烃源岩;阿堵拉组下段陆棚相泥岩形成于海平面上升时期,水体较深且贫氧,古气候为半干燥—半湿润气候,化学风化程度中等,陆源输入较低,水体盐度较高;上段泥岩沉积期处于盆地萎缩消亡阶段,沉积环境逐渐由陆棚相转变为三角洲相,水体较浅且富氧,经历了干燥—半干燥—半湿润的古气候变化,陆源输入相应增多,为咸水—半咸水环境,受到淡水输入的影响。阿堵拉组的源岩为长英质火山岩,源区构造背景以大陆岛弧为主,可能来自早—中三叠世金沙江缝合带岛弧源区。阿堵拉组下段陆棚相泥岩TOC含量与氧化还原条件指标具有较好的正相关性,表明烃源岩发育主要受到海平面上升时贫氧水体控制;上段陆棚—三角洲相泥岩TOC含量与古环境参数无明显相关性,TOC含量大于2%的泥岩沉积期具有较高陆源输入和相对湿润的古气候,综合分析认为烃源岩发育受到古气候、陆源输入等多种因素综合影响。

     

  • 图  1  羌塘盆地构造单元(a),研究区地表地层分布(b)及鄂尔托陇巴剖面地层柱状图(c)

    图b修改自参考文献[23]。

    Figure  1.  Tectonic units of Qiangtang Basin (a), surface stratigraphic distribution in study area (b) and lithology column of Eertuolongba section (c)

    图  2  羌塘盆地东部鄂尔托陇巴剖面三叠系阿堵拉组岩性特征

    a.波里拉组深灰色泥晶灰岩;b.阿堵拉组深灰色薄片状泥岩;c.阿堵拉组灰色薄板状粉砂岩;d.样品A-26,含灰粉砂质泥岩,128.04 m;e.样品A-25,含灰粉砂质泥岩,130.55 m;f.样品A-15,含灰残余生屑泥岩,263.31 m;g.样品A-9,泥岩,312.66 m;h.样品A-6, 泥岩,331.61 m; i.样品A-1,残余生屑泥岩,383.25 m。

    Figure  2.  Lithologic characteristics of Triassic Adula Formation in Eertuolongba section of eastern Qiangtang Basin

    图  3  羌塘盆地东部鄂尔托陇巴剖面三叠系阿堵拉组泥岩PAAS标准化稀土元素配分模式

    PAAS标准值参考MCLENNAN[36]

    Figure  3.  Post Australia Archean Shale-normalized REE distribution patterns of mudstone in Triassic Adula Formation of Eertuolongba section in eastern Qiangtang Basin

    图  4  羌塘盆地东部鄂尔托陇巴剖面三叠系阿堵拉组泥岩古环境参数

    Figure  4.  Paleoenvironmental parameters of mudstones in Triassic Adula Formation of Eertuolongba section of eastern Qiangtang Basin

    图  5  羌塘盆地东部鄂尔托陇巴剖面三叠系阿堵拉组泥岩MoEF-UEF交会图

    底图据参考文献[42]。

    Figure  5.  Crossplot of MoEF vs. UEF of Triassic Adula Formation mudstone in Eertuolongba section of eastern Qiangtang Basin

    图  6  羌塘盆地东部鄂尔托陇巴剖面三叠系阿堵拉组泥岩Zr/Sc-Th/Sc(a)和La/Sc-Co/Th(b)图解

    底图分别据参考文献[44]和[45]。

    Figure  6.  Correlation diagrams of Zr/Sc vs. Th/Sc (a) and La/Sc vs. Co/Th (b) for Triassic Adula Formation mudstone in Eertuolongba section of eastern Qiangtang Basin

    图  7  羌塘盆地东部鄂尔托陇巴剖面三叠系阿堵拉组泥岩Ti/Zr-La/Sc(a)和Th-Co-Sc(b)图解

    底图据参考文献[44]。

    Figure  7.  Diagrams of Ti/Zr vs. La/Sc (a) and Th-Co-Sc (b) for mudstone in Triassic Adula Formation in Eertuolongba section of eastern Qiangtang Basin

    图  8  羌塘盆地东部鄂尔托陇巴剖面三叠系阿堵拉组烃源岩TOC含量与古环境指标交会图

    Figure  8.  Crossplots of TOC vs. paleo environment parameters of Triassic Adula Formation mudstone in Eertuolongba section of eastern Qiangtang Basin

    图  9  羌塘盆地东部鄂尔托陇巴剖面三叠系阿堵拉组烃源岩发育模式

    Figure  9.  Development patterns of source rocks in Triassic Adula Formation of Eertuolongba section in eastern Qiangtang Basin

    表  1  北羌塘坳陷东部鄂尔托陇巴剖面三叠系阿堵拉组泥岩主量和微量元素含量

    Table  1.   Contents of major and trace elements in mudstones of Triassic Adula Formation of Eertuolongba section in eastern area of North Qiangtang Depression

    样号 ω(TOC)/% ω(TS)/% 主量元素含量/% 微量元素含量/(μg/g)
    Al2O3 CaO Fe2O3 K2O MgO MnO Na2O TiO2 Ba Co Cr Cu Ni Sr V Mo Zr Th U Ga Rb Sc
    A-28 1.13 0.11 15.73 0.49 4.30 3.61 1.15 0.03 1.01 0.72 648.70 7.82 66.98 31.62 20.55 104.52 93.84 1.40 242.98 22.21 3.40 26.03 172.81 10.89
    A-27 1.79 0.14 17.10 5.07 5.17 3.40 1.46 0.07 0.91 0.59 245.72 10.00 58.67 33.80 27.22 143.95 97.43 2.77 189.65 24.44 3.56 21.83 174.46 13.34
    A-26 2.21 0.17 16.64 6.61 5.47 3.23 1.56 0.08 0.90 0.55 989.91 10.58 56.26 44.85 36.42 208.01 138.15 7.25 179.58 24.73 4.17 28.60 182.07 13.52
    A-25 1.84 0.18 16.67 4.45 4.69 3.17 1.40 0.05 1.16 0.58 260.68 12.21 63.38 41.29 33.74 137.46 93.24 3.15 204.46 24.90 3.95 21.25 165.76 13.65
    A-24 3.23 0.15 16.41 6.44 4.31 3.30 1.41 0.05 0.82 0.50 273.98 5.70 57.73 57.69 21.58 177.92 83.77 2.59 169.94 24.35 3.57 21.52 178.49 13.06
    A-23 2.60 0.17 17.76 3.63 4.11 3.66 1.29 0.04 0.79 0.53 379.01 10.37 53.48 50.54 28.18 160.12 91.32 3.40 187.66 25.30 4.34 24.93 171.60 13.01
    A-22 2.45 0.17 16.40 6.14 5.01 3.23 1.38 0.05 0.96 0.50 251.22 8.38 48.63 44.53 24.87 188.75 70.17 2.55 168.84 26.71 3.72 21.07 170.59 13.37
    A-21 2.24 0.17 10.09 26.33 3.03 2.02 0.91 0.12 0.54 0.31 264.50 5.92 32.34 42.30 21.13 322.75 51.99 1.48 100.70 14.06 2.35 14.01 114.75 9.18
    A-20 1.93 0.13 16.21 8.57 4.15 3.12 1.30 0.06 1.03 0.45 246.95 8.84 66.79 39.31 21.43 223.23 85.37 1.08 153.59 26.58 3.31 20.82 179.73 13.76
    A-19 2.34 0.32 14.79 12.14 4.05 2.74 1.40 0.05 0.89 0.38 268.78 5.56 61.37 38.28 20.35 341.48 74.83 2.02 126.07 22.72 3.18 19.05 161.75 12.63
    A-18 0.96 0.14 8.90 21.74 3.20 1.68 0.96 0.09 1.06 0.30 827.77 5.30 29.24 24.09 15.04 325.88 40.19 0.80 114.90 16.08 2.57 19.71 98.75 9.29
    A-17 1.18 0.14 11.94 18.47 3.65 2.14 1.13 0.10 0.74 0.34 234.24 4.68 35.20 33.38 17.64 302.68 47.50 1.08 118.69 18.74 2.81 16.43 126.75 10.81
    A-16 1.65 0.19 16.02 11.90 4.80 3.12 1.37 0.09 0.58 0.44 271.70 8.59 63.33 43.17 32.01 285.83 118.20 6.27 135.23 22.03 3.61 21.09 191.91 14.58
    A-15 1.13 0.16 14.95 15.43 4.29 2.86 1.44 0.10 0.64 0.39 632.74 13.42 35.54 37.96 26.21 401.63 61.01 2.03 132.22 18.67 3.28 23.44 173.61 13.63
    A-14 0.36 0.19 19.58 3.55 6.37 3.57 1.94 0.03 0.53 0.57 257.91 20.38 56.32 28.83 34.01 174.32 103.55 0.50 177.83 22.62 3.42 26.34 174.69 16.26
    A-13 1.19 0.23 12.20 20.62 4.02 2.14 1.36 0.10 0.64 0.33 771.08 5.28 34.19 33.01 19.58 452.89 50.64 1.43 110.09 16.69 3.15 22.15 131.93 11.54
    A-12 1.05 0.13 9.56 24.22 3.70 1.89 1.23 0.10 0.63 0.30 1062.15 6.74 29.49 26.22 20.70 463.65 46.07 1.56 100.84 14.58 2.90 23.07 116.13 10.28
    A-11 0.84 0.25 18.68 4.19 6.24 3.46 1.63 0.12 0.66 0.62 475.50 16.66 73.16 32.81 38.10 182.75 129.24 2.20 179.99 22.86 3.74 26.16 187.39 16.07
    A-10 1.73 0.21 17.24 6.96 5.54 3.29 1.53 0.10 0.70 0.48 785.69 12.83 78.17 44.66 46.42 255.22 180.20 5.73 149.57 22.97 4.35 28.32 194.66 13.86
    A-09 1.08 0.11 19.71 3.04 5.72 3.93 1.64 0.08 0.57 0.57 234.20 19.36 64.47 34.91 40.43 154.85 138.38 3.70 174.76 25.16 3.99 25.81 197.09 15.73
    A-08 1.64 0.19 17.10 9.46 5.83 3.37 1.63 0.15 0.56 0.48 509.65 15.08 64.58 41.39 50.02 315.36 176.75 10.30 145.27 22.85 4.54 24.35 210.27 13.93
    A-07 1.56 0.11 13.87 18.63 5.41 2.68 1.43 0.25 0.36 0.35 598.01 8.49 58.85 38.54 35.48 985.29 179.12 9.15 111.92 18.05 4.60 21.81 170.21 11.88
    A-06 0.96 0.11 18.05 9.55 5.84 3.61 1.71 0.14 0.43 0.48 183.99 16.99 59.48 36.49 40.15 287.95 136.19 4.17 147.76 23.46 4.29 22.90 227.05 15.71
    A-06 1.41 0.19 15.46 14.08 6.04 2.94 1.63 0.19 0.42 0.42 575.02 10.46 56.16 46.82 37.85 452.39 149.34 7.14 124.41 20.03 4.22 23.67 178.71 12.69
    A-04 1.45 0.09 18.84 6.49 7.31 3.81 1.73 0.41 0.43 0.48 448.81 35.42 56.12 65.63 94.07 248.68 150.11 8.08 160.44 24.67 4.24 26.67 213.20 16.72
    A-03 1.62 0.12 14.60 16.59 5.29 2.91 1.44 0.14 0.45 0.37 711.24 7.56 50.60 39.52 30.45 653.30 146.26 4.49 119.74 20.48 4.12 23.75 172.69 11.80
    A-02 1.78 0.17 16.16 13.78 5.70 3.39 1.61 0.16 0.37 0.39 2530.29 13.14 59.69 50.12 50.05 446.09 191.78 6.00 124.61 20.89 5.24 44.66 214.16 14.33
    A-01 1.17 0.19 13.38 19.01 5.22 2.71 1.56 0.20 0.39 0.36 1302.36 10.67 38.57 37.12 28.55 578.31 67.20 2.47 107.34 17.00 3.79 28.13 158.81 11.23
    下载: 导出CSV

    表  2  北羌塘坳陷东部地区鄂尔托陇巴剖面三叠系阿堵拉组泥岩稀土元素含量

    Table  2.   Contents of rare earth elements in mudstones of Triassic Adula Formation of Eertuolongba section in eastern area of North Qiangtang Depression

    样号 稀土元素含量/(μg/g) ∑REE/(μg/g) LREE/HREE PAAS标准化
    La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu δCe δEu (La/Yb)N
    A-28 36.25 71.44 8.32 29.42 5.25 1.09 5.62 0.82 4.90 1.00 3.25 0.48 3.29 0.50 171.63 7.64 0.95 0.94 0.81
    A-27 36.34 72.69 8.45 31.38 6.20 1.11 6.40 0.94 5.27 1.06 3.24 0.47 3.21 0.48 177.24 7.41 0.96 0.83 0.83
    A-26 35.85 73.23 8.56 32.46 6.59 1.38 6.83 1.01 5.71 1.13 3.39 0.48 3.27 0.50 180.39 7.08 0.96 0.97 0.81
    A-25 37.24 76.86 8.94 33.34 6.74 1.16 6.93 1.02 5.86 1.16 3.56 0.51 3.43 0.52 187.29 7.14 0.97 0.80 0.80
    A-24 32.09 64.21 7.72 28.65 5.76 1.04 6.13 0.92 5.29 1.05 3.23 0.46 3.06 0.46 160.07 6.77 0.94 0.83 0.77
    A-23 36.08 72.95 8.35 30.48 5.82 1.04 6.22 0.92 5.44 1.09 3.41 0.51 3.44 0.52 176.27 7.17 0.97 0.81 0.77
    A-22 34.08 69.81 8.52 32.35 6.93 1.20 7.15 1.07 6.01 1.15 3.44 0.48 3.32 0.49 176.00 6.62 0.95 0.81 0.76
    A-21 30.24 60.75 6.98 26.60 5.65 1.27 6.03 0.85 4.69 0.91 2.63 0.37 2.42 0.35 149.76 7.20 0.96 1.02 0.92
    A-20 34.73 71.67 8.24 30.79 6.02 1.07 6.33 0.92 5.17 1.02 3.12 0.44 2.99 0.44 172.96 7.46 0.98 0.82 0.86
    A-19 28.47 57.47 7.09 27.11 5.60 0.94 5.86 0.88 4.98 0.98 2.98 0.42 2.87 0.42 146.07 6.53 0.93 0.77 0.73
    A-18 29.47 59.19 6.95 26.88 5.57 1.13 5.67 0.83 4.53 0.90 2.68 0.37 2.45 0.37 146.98 7.26 0.95 0.94 0.89
    A-17 29.06 56.66 7.08 27.45 5.77 1.05 6.16 0.91 5.07 0.97 2.87 0.38 2.59 0.39 146.42 6.57 0.91 0.83 0.83
    A-16 30.25 61.39 7.55 28.32 6.09 1.09 6.54 0.97 5.46 1.07 3.17 0.45 3.04 0.46 155.84 6.37 0.94 0.81 0.73
    A-15 29.82 57.41 6.78 25.10 5.33 1.06 5.84 0.87 5.09 1.03 3.18 0.46 3.07 0.45 145.48 6.28 0.93 0.89 0.72
    A-14 38.83 79.37 9.12 33.40 6.04 1.08 6.28 0.91 5.20 1.06 3.25 0.47 3.19 0.48 188.69 8.05 0.97 0.83 0.90
    A-13 28.10 52.67 6.48 24.91 5.20 1.14 5.80 0.86 4.84 0.95 2.83 0.39 2.63 0.38 137.19 6.34 0.90 0.98 0.79
    A-12 26.94 50.49 6.28 24.09 5.14 1.18 5.64 0.82 4.60 0.90 2.66 0.37 2.43 0.34 131.87 6.42 0.90 1.03 0.82
    A-11 38.71 79.63 9.01 33.47 6.37 1.28 6.89 0.99 5.59 1.11 3.35 0.48 3.26 0.50 190.64 7.60 0.98 0.91 0.88
    A-10 30.60 61.21 7.16 26.29 5.30 1.12 5.73 0.84 4.80 0.97 2.95 0.43 2.95 0.43 150.78 6.90 0.95 0.96 0.77
    A-09 30.03 62.33 6.78 24.49 4.98 0.92 5.39 0.83 4.89 0.98 3.11 0.46 3.16 0.47 148.81 6.71 1.01 0.83 0.70
    A-08 31.75 64.84 7.52 27.86 5.72 1.14 6.18 0.88 5.01 0.99 3.00 0.43 2.88 0.44 158.64 7.01 0.97 0.91 0.81
    A-07 27.47 55.78 6.99 27.81 6.33 1.68 6.71 0.93 4.91 0.95 2.82 0.39 2.62 0.38 145.78 6.39 0.93 1.21 0.78
    A-06 33.82 71.17 8.12 30.32 6.26 1.13 6.48 0.94 5.26 1.03 3.16 0.45 3.03 0.45 171.64 7.25 0.99 0.83 0.82
    A-06 31.49 63.88 7.46 27.99 5.96 1.19 6.31 0.93 5.24 1.05 3.11 0.44 2.95 0.42 158.41 6.75 0.96 0.92 0.79
    A-04 36.35 89.66 8.83 33.20 7.06 1.30 7.62 1.12 6.31 1.23 3.79 0.53 3.63 0.55 201.18 7.12 1.15 0.84 0.74
    A-03 28.42 56.80 6.65 24.40 4.95 1.07 5.38 0.79 4.52 0.89 2.72 0.38 2.64 0.39 140.00 6.91 0.95 0.98 0.80
    A-02 27.54 57.85 6.81 25.36 5.53 1.53 5.78 0.84 4.73 0.92 2.78 0.39 2.69 0.40 143.18 6.72 0.97 1.27 0.76
    A-01 27.52 57.37 6.87 25.81 5.57 1.32 5.81 0.83 4.58 0.89 2.61 0.37 2.42 0.36 142.34 6.96 0.96 1.09 0.84
    注: PAAS标准值据MCLENNAN[36], ∑REE=La+Ce+Pr+Nd+Sm+Eu+Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu, LREE/HREE= (La+Ce+Pr+Nd+Sm+Eu)/(Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu), δCe=CeN/(LaN×PrN)1/2, δEu = EuN/(SmN×GdN)1/2, 下标N表示计算使用PAAS标准化。
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-10-24
  • 修回日期:  2024-04-09
  • 刊出日期:  2024-05-28

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