鄂尔多斯地区中元古界长城系沉积特征研究  

The sedimentary characteristics of the Middle Proterozoic Changchengian system in Ordos area

作　　者：欧阳征健 冯娟萍[2] 马海勇[2] 李文厚[3] OUYANG Zhengjian;FENG Juanping;MA Haiyong;LI Wenhou(Bailie School of Petroleum Engineering,Lanzhou City University,Gansu 730070,China;College of Geology and Environment,Xi′an University of Science and Technology,Xi′an 710054,China;Department of Geology,Northwest University,Xi′an 710069,China)

机构地区：[1]兰州城市学院培黎石油工程学院,兰州730070 [2]西安科技大学地质与环境学院,陕西西安710054 [3]西北大学地质学系,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2020年第1期105-112,共8页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金青年项目(41502107);陕西省自然科学基础研究计划项目(2013JQ5009)

摘　　要：利用野外剖面考察、岩心观察、薄片鉴定和粒度分析等技术手段对鄂尔多斯地区中元古界长城系沉积区的沉积特征进行研究。研究表明,长城系岩性主要为紫红色、灰白色石英砂岩、石英岩,夹少量碳酸盐岩,含多层石英细砾岩。砂岩成分成熟度和结构成熟度比较高;层理构造发育,主要为陆相、海陆过渡相层理构造,可见波痕和干裂等层面构造;鄂尔多斯地区中元古界长城系自北东向西南具有水体逐渐加深的趋势,依次发育河流、三角洲、滨浅海、浅海及深海沉积相。Based on investigation of outcrops and cores in the field,observation of thin sections by microscope and analysis of grain size,the sedimentary characteristics of the Middle Proterozoic Changchengian system have been studied carefully in Ordos area.The study results show that the lithology of the Changchengian system is mainly magenta and gray-white quartz sandstone and quartzite with a small amount of carbonate rocks and multi-layer fine quartz conglomerate.Component and structural maturity of these sandstone are relatively high,and a variety of bedding structures and surface structures such as ripples and mud fissures in continental and sea-land transition facies are developed in the sandstone.Combined with the above research,it shows that the water body of the Middle Proterozoic Changchengian system tended to deepen gradually from northeast to southwest in Ordos area which developed fluvial,deltaic,coastal and shallow marine,shallow marine and deep-sea sedimentary facies in turn,and the research results can provide basic data for deep oil and gas exploration in this area.

关 键 词：鄂尔多斯地区 中元古界 长城系 沉积特征 

分 类 号：P618.13[天文地球—矿床学]