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珠江口盆地阳江东凹文昌组泥岩稀土元素特征及其地质意义

石创

石创. 珠江口盆地阳江东凹文昌组泥岩稀土元素特征及其地质意义[J]. 地质科技通报, 2022, 41(3): 166-172. doi: 10.19509/j.cnki.dzkq.2022.0067
引用本文: 石创. 珠江口盆地阳江东凹文昌组泥岩稀土元素特征及其地质意义[J]. 地质科技通报, 2022, 41(3): 166-172. doi: 10.19509/j.cnki.dzkq.2022.0067
Shi Chuang. REE characteristics and geological significance of mudstones from Wenchang Formation in eastern Yangjiang Sag of Pearl River Mouth Basin[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 166-172. doi: 10.19509/j.cnki.dzkq.2022.0067
Citation: Shi Chuang. REE characteristics and geological significance of mudstones from Wenchang Formation in eastern Yangjiang Sag of Pearl River Mouth Basin[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 166-172. doi: 10.19509/j.cnki.dzkq.2022.0067

珠江口盆地阳江东凹文昌组泥岩稀土元素特征及其地质意义

doi: 10.19509/j.cnki.dzkq.2022.0067
基金项目: 

"十三五"国家科技重大专项课题项目 2016ZX05024-004-002

中海油"十三五"科技重点项目 CNOOC-KJ135ZDXM37SZ

详细信息
    作者简介:

    石创(1988—),男,工程师,主要从事油气成藏和资源评价方面的研究工作。E-mail: shichuang@cnooc.com.cn

  • 中图分类号: P588.22

REE characteristics and geological significance of mudstones from Wenchang Formation in eastern Yangjiang Sag of Pearl River Mouth Basin

  • 摘要:

    沉积岩中的稀土元素具有良好的化学稳定性, 能够较好保存原始沉积记录。为了揭示阳江东凹文昌组发育时期的物源区物质来源、构造背景和沉积环境, 选取凹陷内Y-1井文昌组泥岩样品进行元素测试, 系统分析研究区文昌组泥岩稀土元素地球化学特征。结果表明, 文昌组泥岩稀土元素含量高, 轻稀土元素相对富集, Eu为明显负异常, Ce为微弱正异常特征。文昌组物质来源以花岗岩为主, 含有少量沉积岩, 沉积源区为被动大陆边缘构造背景。CeanomδCe参数指示文昌期水体处于还原环境, 为优质烃源岩发育提供良好的保存条件, 纵向上水体还原性演化规律为: 强→弱→强→弱, 与文昌组泥岩TOC变化趋势一致。

     

  • 图 1  珠江口盆地阳江凹陷构造单元及地层划分(据参考文献[9]修编)

    Figure 1.  Tectonic units and stratigraphic column of Yangjiang Sag, Pearl River Mouth Basin

    图 2  阳江东凹Y-1井取样位置

    Figure 2.  Sampling positions of Well Y-1 in eastern Yangjiang Sag

    图 3  阳江东凹文昌组泥岩样品稀土元素配分模式

    Figure 3.  REE distribution of mudstones from Wenchang Formation in Eastern Yangjiang Sag

    图 4  阳江东凹文昌组泥岩样品中δCe与∑REE、δEu和(Dy/Sm)N相关关系

    Figure 4.  Correlation of δCe vs.∑REE, δEu and(Dy/Sm)N of mudstones from Wenchang Formation in eastern Yangjiang Sag

    图 5  阳江东凹文昌组泥岩La/Yb与w(∑REE)交会图(底图据文献[1])

    Figure 5.  La/Yb vs. ∑REE of mudstones from Wenchang Formation in eastern Yangjiang Sag

    图 6  阳江东凹文昌组泥岩La-Th-Sc构造背景判别图

    Figure 6.  Tectonic setting discrimination of La-Th-Sc of mudstones from Wenchang Formation in eastern Yangjiang Sag

    图 7  阳江东凹文昌组泥岩δCe、V/(V+Ni)、MgO/Al2O3w(TOC)纵向变化

    Figure 7.  Vertical variation of δCe, V/(V+Ni), MgO/Al2O3and TOC of mudstones from Wenchang Formation in eastern Yangjiang Sag

    表  1  阳江东凹文昌组泥岩稀土元素质量分数

    Table  1.   REE contents of mudstones from Wenchang Formation in eastern Yangjiang Sag  wB/10-6

    样号 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
    1 39.22 84.31 8.96 32.94 7.44 1.54 7.80 0.99 5.48 0.99 2.78 0.41 2.63 0.40
    2 49.52 105.97 11.13 41.03 8.94 1.66 10.84 1.29 7.20 1.29 3.62 0.52 3.33 0.49
    3 48.46 102.40 10.78 39.63 8.46 1.56 10.27 1.18 6.53 1.16 3.26 0.47 3.09 0.46
    4 47.82 102.15 10.76 39.57 8.69 1.65 10.37 1.21 6.74 1.20 3.35 0.48 3.11 0.46
    5 54.53 116.22 12.18 44.41 10.16 2.10 11.45 1.35 7.38 1.33 3.65 0.53 3.39 0.50
    6 44.95 95.44 10.05 37.10 8.24 1.63 9.59 1.17 6.52 1.19 3.32 0.49 3.07 0.47
    7 62.76 132.31 14.07 52.21 11.55 2.28 13.93 1.60 8.80 1.55 4.25 0.61 3.91 0.57
    8 62.41 130.19 13.90 50.09 11.34 2.43 13.25 1.45 7.90 1.38 3.80 0.55 3.53 0.52
    9 50.04 109.21 11.57 42.81 9.69 1.92 11.06 1.35 7.50 1.35 3.74 0.54 3.37 0.50
    10 44.63 94.26 9.35 32.22 7.06 1.69 7.50 0.92 5.08 0.90 2.49 0.36 2.35 0.35
    球粒陨石[16] 0.30 0.80 0.12 0.60 0.19 0.07 0.26 0.05 0.32 0.07 0.21 0.03 0.21 0.03
    NASC[17] 32.00 73.00 7.90 33.00 5.70 1.24 5.20 0.85 5.80 1.04 3.40 0.50 3.10 0.48
    PAAS[18] 38.00 80.00 8.90 32.00 5.60 1.10 4.70 0.77 4.40 1.00 2.90 0.40 2.80 0.43
    注:NASC表示北美页岩中稀土元素的平均质量分数;PAAS表示澳大利亚后太古宙页岩中稀土元素的平均质量分数
    下载: 导出CSV

    表  2  阳江东凹文昌组泥岩元素分析结果

    Table  2.   REE analyses of mudstones from Wenchang Formation in eastern Yangjiang Sag

    样号 w(TOC)/
    %
    ∑REE ∑LREE ∑HREE ∑LREE/
    ∑HREE
    (La/Sm)S (La/Yb)S (Gd/Yb)S (Dy/Sm)S δCe δEu Ceanom V/
    (V+Ni)
    MgO/
    Al2O3
    wB/10-6
    1 2.43 195.90 174.41 21.49 8.12 3.34 10.43 2.39 0.44 1.03 0.64 0.001 9 0.84 5.35
    2 2.82 246.83 218.25 28.58 7.64 3.51 10.41 2.63 0.48 1.03 0.53 0.001 6 0.85 3.99
    3 2.45 237.70 211.29 26.41 8.00 3.63 10.98 2.69 0.46 1.02 0.53 -0.002 2 0.86 3.99
    4 2.30 237.56 210.63 26.92 7.82 3.49 10.76 2.69 0.46 1.03 0.55 0.001 1 0.86 4.11
    5 3.13 269.19 239.62 29.57 8.10 3.40 11.27 2.73 0.43 1.03 0.62 0.002 0 0.86 4.33
    6 3.48 223.21 197.41 25.81 7.65 3.46 10.26 2.53 0.47 1.02 0.58 -0.001 3 0.85 4.35
    7 2.66 310.40 275.18 35.22 7.81 3.44 11.24 2.88 0.45 1.01 0.57 -0.005 4 0.84 4.12
    8 2.17 302.73 270.34 32.39 8.35 3.49 12.38 3.03 0.41 1.01 0.63 -0.005 5 0.80 4.29
    9 3.49 254.64 225.23 29.41 7.66 3.27 10.39 2.65 0.46 1.04 0.59 0.006 2 0.82 3.05
    10 6.00 209.16 189.20 19.95 9.48 4.01 13.31 2.58 0.43 1.04 0.73 0.012 3 0.90 1.74
    注:稀土元素总量∑REE=La+Ce+Pr+Nd+Sm+Eu+Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu;轻稀土元素质量分数∑LREE=La+Ce+Pr+Nd+Sm+Eu;重稀土元素质量分数∑HREE=Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu;δCe=2CeS/(LaS+PrS),δEu=2EuS/(SmS+GdS);Ceanom=lg[3×CeN/(2×LaN+NdN)];下标S表示经过球粒陨石标准化,下标N表示经过北美页岩标准化
    下载: 导出CSV

    表  3  阳江东凹文昌组泥岩与不同构造背景杂砂岩稀土元素特征值比较

    Table  3.   Comparison of REE values between the mudstones of Wenchang Formation in eastern Yangjiang Sag and heterogeneous sandstones in different tectonic settings

    构造背景 活动大陆边缘 被动大陆边缘 研究区校正后均值
    w(La)/10-6 37.00 39.00 42.00
    w(Ce)/10-6 78.00 85.00 89.00
    w(∑REE)/10-6 186.00 210.00 207.00
    ∑LREE/∑HREE 9.10 8.50 6.72
    La/Yb 12.50 15.90 13.27
    (La/Yb)N 8.50 10.80 9.29
    δEu 0.60 0.56 0.50
    注:数据值据参考文献[26]
    下载: 导出CSV
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