新疆西大龙口下仓房沟群沉积环境分析与烃源岩评价

发布时间：2018-04-11 07:28

  本文选题：地球化学 + 沉积相　； 参考：《山东科技大学》2017年硕士论文

【摘要】：新疆西大龙口下仓房沟群地层由下而上分为泉子街组、梧桐沟组和锅底坑组。通过对研究区露头剖面的实测,详细观察了研究区的岩石类型、沉积构造及其组合特征,分析了沉积相和亚相,从而总结出沉积环境特征。研究区剖面出露较好,沉积标志丰富,沉积相标志明显。沉积相类型主要为河流相、三角洲相和湖泊相。本文根据V/Cr、Ni/Co、δEu、δCe、Sr/Cu、Sr/Ba比值等化学参数表明,研究区沉积环境为氧化环境,淡水湖,气候由干旱逐渐转变为湿润,再转变为半干旱。根据稀土—微量元素丰度及组合分析,发现研究区物源来自大陆边缘上地壳的长英质岩石,并伴有火山岩混入,源区构造环境为大陆岛弧。通过饱和烃GC—MS等地球化学测试技术,对新疆西大龙口梧桐沟组—锅底坑组烃源岩有机质丰度、有机质类型和有机质成熟度等指标参数分析,对该套烃源岩的生烃能力进行初步评价。研究表明,该套烃源岩有机质丰度中等,有机质类型为Ⅱ型、Ⅲ型;有机质演化主体上已进入成熟阶段,有机质来源主要为陆生高等植物,同时也有水生生物。本文对新疆西大龙口下仓房沟群沉积环境综合分析,研究地质沉积时的古地理、古环境,给在研究区做沉积地质的研究者提供帮助,从而为研究区油气资源的勘探与开发提供参考。
[Abstract]:The lower Cangfanggou group in West Dalong mouth of Xinjiang is divided into three groups from bottom to top: Quanzijie formation, Wutonggou formation and Guodikeng formation.In this paper, the types of rocks, sedimentary structures and their assemblages in the study area are observed in detail, and the sedimentary facies and subfacies are analyzed, and the sedimentary environment characteristics are summarized through the measurement of outcrop profile in the study area.The profile of the study area is good, the sedimentary mark is abundant, and the sedimentary facies mark is obvious.The sedimentary facies are mainly fluvial facies, delta facies and lacustrine facies.According to the chemical parameters such as V / Cr / Ni / Co, 未 EU, 未 CeS / Cu / Cu / Ba ratio, the sedimentary environment of the studied area is oxidation environment, and the climate of freshwater lake is gradually changed from drought to wetness and then to semi-arid.Based on the abundance and assemblage analysis of rare earths and trace elements, it is found that the source material of the study area comes from the felsic rocks in the upper crust of the continental margin, with volcanic rocks mixed in, and the tectonic environment of the source region is continental island arc.Based on the geochemical measurement techniques such as saturated hydrocarbon (GC-MS), the organic matter abundance, organic matter type and maturity of source rock of Wutonggou formation and Guodikeng formation in West Dalong mouth, Xinjiang are analyzed.The hydrocarbon generating ability of this set of source rocks was preliminarily evaluated.The results show that the organic matter abundance of the source rocks is moderate, the organic matter types are type 鈪，

本文编号：1735011