黔南坳陷下寒武统烃源岩地球化学特征及成因

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黔南坳陷下寒武统烃源岩地球化学特征及成因

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中图分类号: TE122

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文章访问数: 2042
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Geochemical Characteristics and Origins of the Lower Cambrian Source Rocks from the Southern Guizhou Depression, SW China

摘要

摘要: 为明确黔南坳陷下寒武统烃源岩地球化学特征及成因，采用岩石热解、GC、GC—MS等方法对3个典型剖面样品进行了系统分析。结果表明：黔南坳陷下寒武统黑色岩系为一套区域性海相优质烃源岩，厚约50~150 m；烃源岩TOC值为0.13%～15.40%，平均3.31%(n=169)；烃源岩干酪根δ13C值为-35.79‰～-29.88‰，平均-32.85‰(n=35)，显微组分主要为腐泥组；烃源岩干酪根海相镜质体反射率值为1.95%～3.96%，其等效镜质体反射率值为2.02%～3.47%；烃源岩饱和烃正构烷烃分布多为单峰形，主峰碳多为C22，C30藿烷和C27规则甾烷含量高，规则甾烷多为C27>C29>C28，Pr/Ph值为0.27～0.62，具较高的伽马蜡烷和硫芴含量，OEP值为0.82~1.11，C31升藿烷22S/(22S+22R)值为0.56~0.63，平均0.59；烃源岩总体具有富集轻稀土元素，Ba、Mo、V、U等元素含量高，具较强Ce负异常、Eu正异常和较高U/Th值等特征。总之，黔南坳陷下寒武统海相烃源岩分布广，厚度较大，有机质丰度高，类型好，热演化程度高，是高古生产力和缺氧环境共同作用的产物，可为黔南坳陷油气生成提供雄厚的成烃物质。
- 烃源岩评价 /
- /
- 海相烃源岩 /
- 生物标志化合物 /
- /
- /
- 生产力 /
- /
- 缺氧环境 /
- /
- 牛蹄塘组 /
- /
- 黔南坳陷
Abstract: The Lower Cambrian source rock samples from three typical profiles in the southern Guizhou Depression were analyzed for TOC values, δ13C values, Tmax temperatures, potential generation, and biomarkers using RockEval, GC, GCMS to elucidate the geochemical characteristics and its origin. The results show that the Lower Cambrian black shales in the southern Guizhou Depression are regional marine excellent source rocks with depth of 50150m, and have the TOC values of 0.13%15.40%, average 3.31%(n=169); the kerogens of the source rocks have the δ13C values of 35.79‰-29.88‰, average 32.85‰(n=35), and the kerogen macerals are mainly sapropelinites; the values of the marine vitrinite reflectance of the kerogens are 1.95%3.96%, and the values of the equivalent vitrinite reflectance are 2.02%3.47%; the distribution shapes of the nalkanes are mainly single peak, and the maximum peak carbon are mainly C22, the C30 hopane and C27ααα20R regular sterane are abundant, the regular steranes are mainly C27>C29>C28, the Pr/Ph values are 0.270.62, the source rocks have relative high abundance of gammacerane and dibenzothiophene, the OEP values are 0.821.11,C31 homohopane 22S/(22S+22R) have values of 0.560.63,average 0.59; the source rocks are generally characterized by enrichment in light REE, Ba, Mo, V and U element, relative strong negative anomaly of Ce element , relative strong positive anomaly of Eu element and relative high ratio of U/Th. In summary, the Lower Cambrian marine source rocks in the southern Guizhou Depression have a wide distribution with a thickness of from tens of meters to hundreds of meters, the source rocks have high TOC values, are excellent for organic matter type, and have a postmaturity. It is the product which is jointly controlled by high paleoproductivity and anoxic environment. It can provide abundant organic matter for hydrocarbon generation in the southern Guizhou Depression. 
- source rock evaluation /
- marine source rock /
- biomarker /
- productivity /
- anoxic environment /
- Niutitang Formation /
- southern Guizhou Depression /

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[1]	魏小松, 严德天, 龚银, 牛杏, 梁万乐, 伏海蛟, 刘紫璇, 杨向荣, 张宝. 鄂西—黔南地区下寒武统页岩旋回地层学研究 . 沉积学报, 2024, 42(3): 823-838. doi: 10.14027/j.issn.1000-0550.2023.106
[2]	何庆, 高键, 董田, 何生, 翟刚毅, 邹高峰. 鄂西地区下寒武统牛蹄塘组页岩元素地球化学特征及沉积古环境恢复 . 沉积学报, 2021, 39(3): 686-703. doi: 10.14027/j.issn.1000-0550.2020.107
[3]	王思贤, 冯彩霞, 刘燊, 范焱. 陕西紫阳下寒武统黑色岩系地球化学特征及成因研究 . 沉积学报, 2020, 38(5): 980-993. doi: 10.14027/j.issn.1000-0550.2019.104
[4]	包建平, 倪春华, 朱翠山, 蒋兴超, 申旭. 高演化地质样品中三芳甾类标志物及其地球化学意义 . 沉积学报, 2020, 38(4): 898-911. doi: 10.14027/j.issn.1000-0550.2019.069
[5]	陈治军, 王志伟, 张少清, 高怡文, 韩长春, 李科社. 二连盆地宝勒根陶海凹陷烃源岩生物标志化合物特征与油源对比 . 沉积学报, 2020, 38(2): 451-462. doi: 10.14027/j.issn.1000-0550.2019.034
[6]	谭昭昭, 王伟明, 李文浩, 卢双舫, 何涛华, 程泽虎. 泌阳凹陷核桃园组三段富有机质泥页岩形成环境及发育模式 . 沉积学报, 2018, 36(6): 1256-1266. doi: 10.14027/j.issn.1000-0550.2018.096
[7]	陈文彬, 付修根, 谭富文, 曾胜强, 冯兴雷, 宋春彦, 王东. 羌塘盆地二叠系白云岩油苗地球化学特征及意义 . 沉积学报, 2017, 35(3): 611-620. doi: 10.14027/j.cnki.cjxb.2017.03.018
[8]	王万春, 王晓锋, 郑建京, 王作栋. 鄂尔多斯盆地西南缘奥陶系泥页岩与碳酸盐岩生物标志物特征对比 . 沉积学报, 2016, 34(2): 404-414. doi: 10.14027/j.cnki.cjxb.2016.02.019
[9]	秦黎明. 新疆西北部和什托洛盖盆地侏罗系低熟煤系烃源岩地球化学特征及生烃条件分析 . 沉积学报, 2009, 27(4): 740-751.
[10]	孙敏卓. 柴达木盆地涩北1井钙质泥岩饱和烃微生物作用的地球化学意义 . 沉积学报, 2009, 27(1): 186-190.
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黔南坳陷下寒武统烃源岩地球化学特征及成因

刊出日期: 2012-08-10

中图分类号: TE122

关键词:

生产力 /

摘要: 为明确黔南坳陷下寒武统烃源岩地球化学特征及成因，采用岩石热解、GC、GC—MS等方法对3个典型剖面样品进行了系统分析。结果表明：黔南坳陷下寒武统黑色岩系为一套区域性海相优质烃源岩，厚约50~150 m；烃源岩TOC值为0.13%～15.40%，平均3.31%(n=169)；烃源岩干酪根δ13C值为-35.79‰～-29.88‰，平均-32.85‰(n=35)，显微组分主要为腐泥组；烃源岩干酪根海相镜质体反射率值为1.95%～3.96%，其等效镜质体反射率值为2.02%～3.47%；烃源岩饱和烃正构烷烃分布多为单峰形，主峰碳多为C22，C30藿烷和C27规则甾烷含量高，规则甾烷多为C27>C29>C28，Pr/Ph值为0.27～0.62，具较高的伽马蜡烷和硫芴含量，OEP值为0.82~1.11，C31升藿烷22S/(22S+22R)值为0.56~0.63，平均0.59；烃源岩总体具有富集轻稀土元素，Ba、Mo、V、U等元素含量高，具较强Ce负异常、Eu正异常和较高U/Th值等特征。总之，黔南坳陷下寒武统海相烃源岩分布广，厚度较大，有机质丰度高，类型好，热演化程度高，是高古生产力和缺氧环境共同作用的产物，可为黔南坳陷油气生成提供雄厚的成烃物质。

Geochemical Characteristics and Origins of the Lower Cambrian Source Rocks from the Southern Guizhou Depression, SW China

Publish Date: 2012-08-10

Keywords:

Abstract: The Lower Cambrian source rock samples from three typical profiles in the southern Guizhou Depression were analyzed for TOC values, δ13C values, Tmax temperatures, potential generation, and biomarkers using RockEval, GC, GCMS to elucidate the geochemical characteristics and its origin. The results show that the Lower Cambrian black shales in the southern Guizhou Depression are regional marine excellent source rocks with depth of 50150m, and have the TOC values of 0.13%15.40%, average 3.31%(n=169); the kerogens of the source rocks have the δ13C values of 35.79‰-29.88‰, average 32.85‰(n=35), and the kerogen macerals are mainly sapropelinites; the values of the marine vitrinite reflectance of the kerogens are 1.95%3.96%, and the values of the equivalent vitrinite reflectance are 2.02%3.47%; the distribution shapes of the nalkanes are mainly single peak, and the maximum peak carbon are mainly C22, the C30 hopane and C27ααα20R regular sterane are abundant, the regular steranes are mainly C27>C29>C28, the Pr/Ph values are 0.270.62, the source rocks have relative high abundance of gammacerane and dibenzothiophene, the OEP values are 0.821.11,C31 homohopane 22S/(22S+22R) have values of 0.560.63,average 0.59; the source rocks are generally characterized by enrichment in light REE, Ba, Mo, V and U element, relative strong negative anomaly of Ce element , relative strong positive anomaly of Eu element and relative high ratio of U/Th. In summary, the Lower Cambrian marine source rocks in the southern Guizhou Depression have a wide distribution with a thickness of from tens of meters to hundreds of meters, the source rocks have high TOC values, are excellent for organic matter type, and have a postmaturity. It is the product which is jointly controlled by high paleoproductivity and anoxic environment. It can provide abundant organic matter for hydrocarbon generation in the southern Guizhou Depression. 

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黔南坳陷下寒武统烃源岩地球化学特征及成因

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Geochemical Characteristics and Origins of the Lower Cambrian Source Rocks from the Southern Guizhou Depression, SW China

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黔南坳陷下寒武统烃源岩地球化学特征及成因

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Geochemical Characteristics and Origins of the Lower Cambrian Source Rocks from the Southern Guizhou Depression, SW China

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黔南坳陷下寒武统烃源岩地球化学特征及成因

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出版历程

Geochemical Characteristics and Origins of the Lower Cambrian Source Rocks from the Southern Guizhou Depression, SW China

计量

出版历程

目录

黔南坳陷下寒武统烃源岩地球化学特征及成因

English Abstract

Geochemical Characteristics and Origins of the Lower Cambrian Source Rocks from the Southern Guizhou Depression, SW China

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