松辽盆地三肇凹陷青山口组页岩中碳酸盐矿物成因研究

吴霞; 陈睿倩; 白昕

doi:10.11781/sysydz2024061226

松辽盆地三肇凹陷青山口组页岩中碳酸盐矿物成因研究

doi: 10.11781/sysydz2024061226

吴霞^{1, 2,},
陈睿倩^{1, 2, ,},
白昕^{1, 2}

1.
中国石油大学(北京) 油气资源与工程全国重点实验室, 北京 102249
2.
中国石油大学(北京) 地球科学学院, 北京 102249

基金项目:

国家自然科学基金 41702126

详细信息

作者简介:
吴霞(2001—), 女, 硕士生, 从事碳酸盐成因相关研究。E-mail: 2088835232@qq.com

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

中图分类号: TE122.2
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- 文章访问数: 52
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- 被引次数: 0
出版历程
- 收稿日期: 2023-11-29
- 修回日期: 2024-09-27
- 刊出日期: 2024-11-28

Genesis of carbonate minerals in shale of Qingshankou Formation, Sanzhao Sag, Songliao Basin

WU Xia^{1, 2
,},
CHEN Ruiqian^{1, 2
, ,},
BAI Xin^{1, 2}

1.
National Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
2.
College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China

摘要

摘要: 为了揭示陆相页岩中碳酸盐矿物对于页岩油气勘探与开发的意义，以松辽盆地三肇凹陷青山口组碳酸盐矿物发育的页岩为研究对象，通过薄片观察、X射线衍射(XRD)、碳氧同位素分析以及主、微量元素分析等实验方法，对碳酸盐矿物的类型及发育特征进行了深入分析，探讨了碳酸盐矿物生成的物质来源和成因机制，并详细说明了碳酸盐矿物发育如何影响页岩油气的富集。研究揭示三肇凹陷青山口组页岩发育三类方解石(生物壳体型碳酸盐、泥晶方解石、亮晶方解石)和两类白云石(泥晶白云石、细晶白云石)。通过稳定碳、氧同位素及主、微量元素的测试分析，表明研究区碳酸盐主要形成于咸化分层、缺氧还原以及中—高生产力的封闭湖泊水体环境中。不同类型的碳酸盐矿物成因各异，生物壳体型碳酸盐、泥晶方解石和泥晶白云石主要受生物化学作用控制，亮晶方解石和细晶白云石则是通过重结晶作用形成。岩石有机碳与岩石热解测定结果表明碳酸盐含量与总有机碳(TOC)含量呈正相关关系，TOC含量与生烃潜量(S₁+S₂)具有正相关关系，表明陆相页岩中碳酸盐矿物发育的层段是优质页岩的发育层段。同时，与碳酸盐矿物相关的晶间孔和溶蚀孔的形成，为页岩中油气的聚集创造了储存条件。
- 碳酸盐矿物 /
- 有机质 /
- 生物化学作用 /
- 重结晶 /
- 沉积环境 /
- 青山口组 /
- 松辽盆地
Abstract: To reveal the significance of carbonate minerals in continental shale for shale oil and gas exploration and development, this paper takes the carbonate mineral developed shale from the Qingshankou Formation in the Sanzhao Sag of the Songliao Basin as the research object. Through thin-section observation, X-ray diffraction (XRD), carbon and oxygen isotope analysis, and major and trace element analysis, the types and development characteristics of carbonate minerals were analyzed in depth. The material sources and genetic mechanisms for carbonate mineral formation were discussed, and how carbonate mineral development affected shale oil and gas enrichment was explained in detail. The study revealed that the shale from the Qingshankou Formation in the Sanzhao Sag developed three types of calcite (biogenic shell carbonates, micritic calcite, and sparry calcite) and two types of dolomite (micritic and fine-grained dolomite). Through the analysis of stable carbon and oxygen isotopes, and major and trace elements, it was shown that the carbonates in the study area mainly formed in a stratified, anoxic, reducing, and moderately to highly productive environment within a closed saline lake. The genesis of different types of carbonate minerals varied. Biogenic shell carbonates, micritic calcite, and micritic dolomite were mainly controlled by biochemical action, and the sparry calcite and fine-grained dolomite were formed through recrystallization. Results from rock organic carbon content and rock pyrolysis tests indicated a positive correlation between carbonate content and total organic carbon (TOC) content and a positive correlation between TOC content and hydrocarban generation potential(S₁+S₂)values, indicating that the carbonate mineral developed intervals in continental shale were high-quality shale development zones. Additionally, the formation of intercrystalline and dissolution pores associated with carbonate minerals created storage conditions for the accumulation of oil and gas in the shale.
- carbonate mineral /
- organic matter /
- biochemical action /
- recrystallization /
- sedimentary environment /
- Qingshankou Formation /
- Songliao Basin
注释:

利益冲突声明/Conflict of Interests

作者陈睿倩是本刊青年编委会成员，未参与本文的同行评审或决策。

Author CHEN Ruiqian is a Young Editorial Board Member of this journal, and she did not take part in peer review or decision making of this article.

作者贡献/Authors'Contributions

吴霞、陈睿倩参与论文写作和修改；吴霞、白昕完成实验操作与数据分析。所有作者均阅读并同意最终稿件的提交。

The manuscript was drafted and revised by WU Xia and CHEN Ruiqian. The experimental operation and data analysis were completed by WU Xia and BAI Xin. All authors have read the last version of the paper and consented to its submission.

HTML全文

图 1 松辽盆地一级构造单元划分(a)和中央坳陷二级构造单元划分(b)

据参考文献^[16]修改。

Figure 1. Primary tectonic units in Songliao Basin (a) and secondary tectonic units in central depression (b)

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图 2 松辽盆地三肇地区地层综合柱状图

据参考文献^[18]修改。

Figure 2. Comprehensive stratigraphic column of Sanzhao area in Songliao Basin

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图 3 松辽盆地肇页1井青一段页岩矿物成分柱形图

Figure 3. Mineral composition of shale from the first member of Qingshankou Formation, well ZY1, Songliao Basin

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图 4 松辽盆地肇页1井青二、三段页岩矿物成分柱形图

Figure 4. Mineral composition of shale from the second and third members of Qingshankou Formation, well ZY1, Songliao Basin

下载: 全尺寸图片幻灯片

图 5 松辽盆地肇页1井青山口组页岩中不同类型方解石的显微镜下特征

a.生物壳体碎屑, ZY1-23, 1 938.1 m; b.泥晶方解石, ZY1-补242, 2 047.6 m; c、d.亮晶方解石, ZY1-221, 2 037.1 m。

Figure 5. Microscopic characteristics of different types of calcite in shale from Qingshankou Formation, well ZY1, Songliao Basin

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图 6 松辽盆地肇页1井青山口组页岩中不同类型方解石的显微镜下特征

a.生物壳体碎屑, ZY1-21, 1 937.1 m; b.生物壳体碎屑, ZY1-22, 1 937.6 m; c.薄纹层状泥晶方解石, ZY1-128, 1 990.6 m; d.薄纹层状泥晶方解石, ZY1-226, 2 039.6 m; e.透镜状亮晶方解石, ZY1-50, 1 951.6 m; f.脉状亮晶方解石, ZY1-149, 2 001.1 m。

Figure 6. Microscopic characteristics of different types of calcite in shale from Qingshankou Formation, well ZY1, Songliao Basin

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图 7 松辽盆地肇页1井青山口组页岩中不同类型白云石的显微镜下特征

a、b.泥晶白云石和细晶白云石，ZY1-160, 2 006.6 m；c、d.透镜状泥晶白云石，ZY1-184，2 018.6 m；e、f.正交偏光下，泥晶白云石和细晶白云石呈高级白干涉色，ZY1-160，2 006.6 m。

Figure 7. Microscopic characteristics of different types of dolomite in shale from Qingshankou Formation, well ZY1, Songliao Basin

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图 8 松辽盆地肇页1井碳酸盐矿物碳、氧同位素相关性

a.全岩碳酸盐碳、氧同位素相关性; b.方解石碳、氧同位素相关性; c.白云石碳、氧同位素相关性; d.碳酸盐Z值分布情况。

Figure 8. Correlation between carbon and oxygen isotopes of carbonate minerals in well ZY1, Songliao Basin

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图 9 松辽盆地肇页1井青山口组古沉积环境演化剖面

图中红线代表 1 975 m处元素比值明显变化处。

Figure 9. Paleo-sedimentary environment evolution profiles of Qingshankou Formation, well ZY1, Songliao Basin

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图 10 松辽盆地肇页1井碳酸盐矿物含量与水体盐度的相关性

Figure 10. Correlation between carbonate mineral content and water salinity in well ZY1, Songliao Basin

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图 11 松辽盆地肇页1井下白垩统青山口组页岩中亮晶方解石发育层段(浅黄色部分)与地球化学特征

Figure 11. Development intervals for sparry calcite (light yellow section) and geochemical characteristics in shale from Qingshankou Formation, well ZY1, Songliao Basin

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图 12 松辽盆地肇页1井青山口组页岩中各类矿物含量与TOC含量相关性分析

Figure 12. Correlation between various mineral contents and TOC content in shale from Qingshankou Formation, well ZY1, Songliao Basin

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图 13 松辽盆地肇页1井青山口组页岩TOC含量与S₁+S₂的相关性分析

Figure 13. Correlation between TOC content and S₁+S₂ values in shale from Qingshankou Formation, well ZY1, Songliao Basin

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图 14 松辽盆地肇页1井页岩中与白云石有关的溶蚀孔

a.泥晶白云石晶粒内溶蚀孔，ZY1-补164，2 009.02 m; b.石英颗粒溶蚀孔与泥晶白云石晶粒内溶蚀孔，ZY1-160，2 006.6 m。

Figure 14. Dissolution pores associated with dolomite in shale from well ZY1, Songliao Basin

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表 1 松辽盆地肇页1井页岩样品不同主、微量元素比值分布

Table 1. Distribution of different major and trace element ratios in shale samples from well ZY1, Songliao Basin

沉积环境指标	元素比值指标	元素比值分布范围	元素比值平均值
古气候	Mg/Ca	0.19~3.51	1.00
古气候	Sr/Cu	3.61~26.92	9.87
古盐度	Sr/Ba	0.32~4.41	1.06
古盐度	Ca/(Fe+Ca)	0.26~0.93	0.49
古氧化还原条件	Ni/Co	1.34~3.52	1.90
古氧化还原条件	V/Cr	1.57~5.98	2.26
古水体深度	Mn/Ti	0.03~0.79	0.17
古水体深度	Rb/K	28.77~49.46	36.55
古生产力	P/Ti	0.18~2.32	0.51
古生产力	Cu/Ti	5.93~165.02	57.31

下载: 导出CSV

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