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松辽盆地白垩系青山口组页岩沉积环境及其含油性特征

白昕 陈睿倩 商斐 张楠

白昕, 陈睿倩, 商斐, 张楠. 松辽盆地白垩系青山口组页岩沉积环境及其含油性特征[J]. 石油实验地质, 2024, 46(5): 1063-1074. doi: 10.11781/sysydz2024051063
引用本文: 白昕, 陈睿倩, 商斐, 张楠. 松辽盆地白垩系青山口组页岩沉积环境及其含油性特征[J]. 石油实验地质, 2024, 46(5): 1063-1074. doi: 10.11781/sysydz2024051063
BAI Xin, CHEN Ruiqian, SHANG Fei, ZHANG Nan. Sedimentary environment and oil-bearing characteristics of shale in Cretaceous Qingshankou Formation in Songliao Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(5): 1063-1074. doi: 10.11781/sysydz2024051063
Citation: BAI Xin, CHEN Ruiqian, SHANG Fei, ZHANG Nan. Sedimentary environment and oil-bearing characteristics of shale in Cretaceous Qingshankou Formation in Songliao Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(5): 1063-1074. doi: 10.11781/sysydz2024051063

松辽盆地白垩系青山口组页岩沉积环境及其含油性特征

doi: 10.11781/sysydz2024051063
基金项目: 

中国石油勘探与生产分公司科技支撑项目“松辽盆地综合地质研究与预探目标优选”子课题“松辽盆地致密油/页岩油富集机理与甜点区评价” KT2018-06-01

详细信息
    作者简介:

    白昕(1998—),男,硕士,从事页岩油评价相关研究。E-mail: 3098785796@qq.com

    通讯作者:

    陈睿倩(1987—),女,博士,副教授,从事石油地质学和地球化学研究。E-mail: richen@cup.edu.cn

  • 中图分类号: TE122.1

Sedimentary environment and oil-bearing characteristics of shale in Cretaceous Qingshankou Formation in Songliao Basin

  • 摘要: 松辽盆地上白垩统青山口组页岩地层厚度大、分布广泛,有机质丰度高,蕴含了丰富的页岩油资源。对页岩地层形成时沉积环境的研究,以及对页岩油富集层段含油性特征的探索,可为页岩油富集层段与甜点的预测提供理论依据。结合前人的研究成果,通过对比松辽盆地中央坳陷区不同凹陷的2口典型井——古龙凹陷GY8HC井和三肇凹陷ZY1井部分样品的总有机碳(TOC)含量、热解数据、有机显微组分类型以及主、微量元素,深入研究了2个凹陷青山口组页岩的含油性差异与沉积环境特征,进而对含油性差异的影响因素进行了分析。研究区青山口组2口典型井的页岩含油性相关指标显示,ZY1井页岩TOC含量显著高于GY8HC井,但其游离烃含量与含油饱和度指数比GY8HC井低。页岩形成时的地球化学环境控制着有机质的富集。对比2口井样品的主、微量元素发现,ZY1井青山口组沉积时期气候更加湿润、水体还原性强,且其古生产力以及古水深要显著高于GY8HC井。这些条件都有利于有机质的保存,因而形成了ZY1井页岩更高的有机质丰度。GY8HC井有机质类型是以腐泥质为主的Ⅰ型干酪根,且处于成熟—高成熟阶段;而ZY1井有机质类型以Ⅱ1型干酪根为主,Ⅰ型含量较少,并处于低熟—成熟阶段,因此,GY8HC井页岩的生油潜力更好。

     

  • 图  1  松辽盆地构造单元划分(a)及其地层综合柱状图(b)

    据参考文献[13]修改。

    Figure  1.  Tectonic unit division of Songliao Basin (a) and comprehensive stratigraphic column (b)

    图  2  松辽盆地古龙凹陷GY8HC井(a)和三肇凹陷ZY1井(b)含油性特征纵向变化

    Figure  2.  Longitudinal variation of oil-bearing characteristics in well GY8HC of Gulong Sag (a) and well ZY1 of Sanzhao Sag (b), Songliao Basin

    图  3  松辽盆地不同凹陷2口典型井白垩系青山口组页岩TOC含量与S1关系

    Figure  3.  Relationship between total organic carbon (TOC) content and free hydrocarbon content (S1) in shale of Cretaceous Qingshankou Formation from two typical wells in different sags of Songliao Basin

    图  4  松辽盆地白垩系青山口组页岩古生产力指标纵向变化

    Figure  4.  Longitudinal variation of paleoproductivity indicators for shale of Cretaceous Qingshankou Formation, Songliao Basin

    图  5  松辽盆地2口典型井的沉积环境指标交会图

    Figure  5.  Cross plotts of sedimentary environment indicators from two typical wells in Songliao Basin

    图  6  松辽盆地白垩系青山口组沉积环境特征

    Figure  6.  Sedimentary environment characteristics of Cretaceous Qingshankou Formation in Songliao Basin

    图  7  松辽盆地白垩系青山口组页岩有机显微组分与古生物镜下照片

    a.深灰色富有机质黏土质页岩,反射荧光(蓝光激发),沥青质体(B)中偶见小孢子体(MiS),2 525.6 m,GY8HC井;b.纹层状钙质页岩,反射荧光(蓝光激发),矿物沥青基质(MB)中见藻类体(Alg)富集分布,2 481.5 m,GY8HC井;c.油浸,反射单偏光下黏土矿物(Cl)基底中见沥青质体充填于岩石孔隙中,黄铁矿(Py)呈团粒状分布,2 021.1 m,ZY1井;d.深灰色页岩,反射荧光(蓝光激发),小孢子体大致平行层面分布,1 987.6 m,ZY1井;e.油浸,反射单偏光下黏土矿物基底中见镜质体(V)破碎呈条带状,碎屑惰质体(ID)零散分布,黄铁矿团粒易见,1 964.6 m,ZY1井;f.油浸,反射单偏光下黏土矿物基底中见丝质体(F)破碎呈不规则块状,沥青质体充填于裂隙中或吸附于黏土矿物中,黄铁矿团粒易见,2 026.1 m,ZY1井;g.生物介壳灰岩,椭圆形生物介壳杂乱分布,1 955.61 m,ZY1井;h.纹层状黏土质页岩,反射荧光(蓝光激发),矿物沥青基质中见藻类体富集呈层状分布,小孢子体呈蠕虫状,2 476 m,GY8HC井;i.黏土质页岩,反射荧光(蓝光激发),矿物沥青基质中见小孢子体呈蠕虫状大致平行层面分布,藻类体呈椭球状,2 384.17 m,GY8HC井。

    Figure  7.  Microscopic photographs of organic macerals and microfossils in shale of Cretaceous Qingshankou Formation in Songliao Basin

    图  8  松辽盆地2口典型井白垩系青山口组页岩的TmaxIH交会图

    Figure  8.  Cross plotts of Tmax and IH in shale of Cretaceous Qingshankou Formation from two typical wells in Songliao Basin

    图  9  松辽盆地2口典型井白垩系青山口组页岩的Tmax数据箱线

    Figure  9.  Box plotts of Tmax data for shale of Cretaceous Qingshankou Formation from two typical wells in Songliao Basin

    表  1  松辽盆地2口井白垩系青山口组页岩含油性特征对比

    Table  1.   Comparison of oil-bearing characteristics of shale in Cretaceous Qingshankou Formation from two wells in Songliao Basin

    井号 深度/m 层段 ω(TOC)/% S1/(mg/g) OSI/(mg/g)
    ZY1 2 020.1~2 050.1 $\frac{0.39 \sim 8.32}{3.72} $ $\frac{0.15 \sim 17.40}{8.01} $ $\frac{37.76 \sim 379.76}{208.78} $
    1 920.6~2 020.1 $\frac{0.47 \sim 4.96}{2.21} $ $\frac{0.26 \sim 9.53}{2.96} $ $\frac{35.94 \sim 555.99}{137.70} $
    GY8HC 2 460.8~2 532.8 $\frac{0.55 \sim 3.74}{1.75} $ $\frac{0.31 \sim 12.18}{5.54} $ $\frac{56.86 \sim 482.09}{310.28} $
    2 340.8~2 460.8 $\frac{0.29 \sim 2.95}{1.36} $ $\frac{0.64 \sim 8.54}{4.17} $ $\frac{147.14 \sim 528.11}{302.75} $
    注:表中分式意义为$\frac{最小值 \sim 最大值}{平均值} $。
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-09-14
  • 修回日期:  2024-07-26
  • 刊出日期:  2024-09-28

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