涪陵地区五峰组–龙马溪组黑色页岩有机质特征及成烃生物分析  

ORGANIC MATTER COMPOSITION AND HYDROCARBON BIOGENIC ANALYSIS ON THE BLACK SHALE OF THE WUFENG–LONGMAXI FORMATIONS IN FULING AREA

作　　者：叶萌萌 潘安阳[1] 张毅[1] 郑书粲 冯庆来 YE Mengmeng;PAN Anyang;ZHANG Yi;ZHENG Shucan;FENG Qinglai(Wuxi Research Institute of Petroleum Geology,SINOPEC,Wuxi 214126;School of Earth Sciences,China University of Geosciences(Wuhan),Wuhan 430074;School of Architectural Engineering,Huanggang Normal University,Huanggang 438000)

机构地区：[1]中国石化石油勘探开发研究院无锡石油地质研究所,无锡214126 [2]中国地质大学地球科学学院,武汉430074 [3]黄冈师范学院建筑工程学院,黄冈438000

出　　处：《微体古生物学报》2023年第4期317-326,共10页Acta Micropalaeontologica Sinica

基　　金：国家科技重大专项项目(2017ZX05036-002)资助。

摘　　要：成烃生物组成、有机质类型及其含量对富有机质页岩的含气量具有决定性的作用。本文以渝东南武隆地区143-5井为例,对五峰组–龙马溪组下段67件富有机质页岩样品开展了有机质类型及成烃生物组成研究,查明其有机质类型以无定形有机质为主,大部分样品含量在60%以上,平均含量约占总有机质量的73%,结构有机质平均丰度为26%,孢型有机质含量不到1%;这3类有机质在剖面下部(第1–5小层)含量均较高,上部(第6、7小层及第8小层下部)较低,顶部(第8小层上部)中等;海生浮游型藻类和笔石是涪陵地区五峰组-龙马溪组富有机质页岩的主要成烃生物。扫描电子显微镜研究表明,无定形有机质仍然含有成烃生物信息及有机质与矿物之间的耦合信息,是今后值得深入研究的方向。The hydrocarbon generating organism assemblages,types of organic matter and their content play a crucial role in determining the gas content of the organic-rich shale.Taking Well 143-5 in Wulong,southeastern Chongqing as an example,this study investigates the organic matter types and hydrocarbon generating organism assemblages of 67 samples of the organic-rich shale from the Wufeng Formation to the lower part of the Longmaxi Formation.Test study indicates that the predominant type of the organic matter is amorphous organic matter,with most samples having a content above 60%and an average content of approximately 73%of the total organic mass.The average abundance of structural organic matter is 26%,while palynomorphs accounts for less than 1%of the samples.The contents of these three types of organic matter are higher in the lower part of the profile(Layers 1–5),lower in the upper part(Layers 6,7 and the lower part of Layer 8),and moderate at the top(upper part of Layer 8).Marine planktonic algae and graptolites are the main hydrocarbon generating organisms in organic-rich shale of the Wufeng–Longmaxi formations in the Fuling area.Scanning electron microscopic study shows that the amorphous organic matter contains information of hydrocarbon generating organisms and coupling information between organic matter and minerals,making it a promising direction for future in-depth research.

关 键 词：有机质类型 孢粉相分析 成烃生物 奥陶纪-志留纪 上扬子地区 

分 类 号：P618.13[天文地球—矿床学]