文档介绍：摘要 I 柴北缘西段古近系沉积相研究 作者简介:蒋斌,男,198 2 年3 月生,师从成都理工大学李凤杰副教授、郑荣才教授,2010 年7 月毕业于成都理工大学沉积学专业,获得理学硕士学位。摘 要 柴北缘西段是柴达木盆地北部一级构造单元,具有良好的油气勘探前景。近年来,随着该区油气勘探和开发的不断深入,对该区古近系沉积相进行分析,以明确沉积体系类型和砂体展布规律,对寻找岩性油气藏具有重要意义。 本论文以钻井岩芯描述以及钻、测井资料为基础,结合野外露头剖面,对取芯井段进行相标志研究,确定各层位所代表的沉积相类型,建立测井相与沉积相的转换关系,实现未取芯井研究层位沉积相划分,识别出研究层段的沉积体系类型,利用各层组间反射波地震相变化,研究区内沉积相变化,在等时格架内讨论地层构型及岩相变化,建立研究区沉积模式。 通过上述研究取得以下认识: ①应用碎屑成分对比、重矿物分析、沉积相分析、稀土元素分析,鄂博梁和冷湖地区主要来自于阿尔金山物源,南八仙-马海地区主要来自赛什腾山物源。②共识别出冲积扇、扇三角洲、辫状河、辫状河三角洲与湖泊等5 种沉积相类型。 ③依据地震相与沉积相的对应关系,研究区内沉积相变化,建立研究区沉积模式,以组为编图单元编制柴北缘古近系岩相古地理分布图。 ④岩相古地理的研究表明,研究区发育两种主要的沉积体系组合类型,以冷湖-南八仙-马海断裂带为界,西北的鄂博梁-冷湖地区为冲积扇-扇三角洲-湖泊沉积体系组合, 东南部马海-南八仙地区则发育冲积扇-辫状河-辫状河三角洲- 湖泊沉积体系组合。 关键词: 岩相古地理 沉积体系组合 古近系 柴达木盆地北缘 成都理工大学硕士学位论文 II Sedimentary facies of the Paleogene in western segment of northern margin of Qaidam Basin Introduction of the author: Jiangbin, male, was born in March, 1982 whose tutor was Professor Li Feng-jie,Zheng Rong-cai . He graduated from Chengdu University of Technology in sedimentation major and was granted the Master Degree in June, 2010. Abstract The western segment of northern margin of Qaidam Basin is one of first – order tectonic units in northern Qaidam Basin. Block the area has good prospects for hydrocarbon exploration. With the continuous progress in the field of petroleum exploration and production, the sedimentary facies analysis of the Paleogene in northern margin Qaidam Basin is of great significance for finding out lithologic oil – gas pools. Based on outcrop observation, core description, well logging and seismic data, facies mark of individual well and type s of sedimentary facies are identified. The relationships between log facies and sedimentary facies have been established. The non- cores drills’ sedimentary facies types and depositional system assemblages are discriminated by the method above. In the study area, the sedimentary facies are studied by using the corresponding relationship between the seismic facies and sedimentary facies a