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延安地区奥陶系马家沟组上组合膏盐岩成盐沉积演化模式研究
投稿时间:2019-10-30  修订日期:2019-12-03  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020043
摘要点击次数: 31
全文下载次数: 26
作者单位E-mail
吴海燕 长安大学地球科学与资源学院
陕西延长石油集团研究院 
616079519@qq.com 
梁婷 长安大学地球科学与资源学院西安 Liangt@chd.edu.cn 
曹红霞 陕西延长石油集团研究院  
乔向阳 陕西延长石油集团研究院  
王凯 陕西延长石油集团研究院  
李克永 西安科技大学地质与环境学院西安  
于 珺 陕西延长石油集团研究院  
郭艳琴 西安石油大学地球科学与工程学院西安  
中文摘要:延安地区是奥陶系碳酸盐岩-膏盐岩共生体系的主要沉积区,其中马家沟组上组合马五43-马五32膏盐沉积是海退蒸发环境的典型代表。利用现场岩心观察、实验分析、钻井及测井资料,根据沉积构造、膏盐岩发育规模、岩性组合方式等,对研究区奥陶系马家沟组上组合膏盐岩的地质特征进行了详细的阐述,系统地总结了研究区马家沟组上组合膏盐岩的沉积背景及沉积相、建立了沉积演化模式。研究表明,在西高东低的沉积格局背景下,地层充填呈西薄东厚,南薄北厚的特点;自西南向东北依次为膏质白云岩-膏岩-盐岩沉积区;垂向发育三种岩石类型组合:Ⅰ型膏质白云岩-硬石膏结核白云岩-膏质白云岩-泥云岩组合,Ⅱ型硬石膏岩-硬石膏结核白云岩-膏质白云岩-泥云岩组合,Ⅲ型盐岩-硬石膏岩-硬石膏结核白云岩-膏质白云岩组合;沉积环境为相对安静且低能的潟湖沉积模式。沉积环境演化为极强蒸发盐化→蒸发膏化→相对开放。
中文关键词:鄂尔多斯盆地  奥陶系马家沟组  马五43-马五32亚段  膏盐岩  成盐沉积演化模式
 
Study on the Salt-forming and Sedimentary Evolution Model of the Upper Ordovician Majiagou Formation in Yan"an Area
Author NameAffiliationE-mail
wuhaiyan 1. College of Geosciences and Resources, Chang''an University Xi'an , China
2. Yanchang Petroleum Group (Limited Liability) Company Research Institute Xi'an China
 
616079519@qq.com 
LiangTing 1. College of Geosciences and Resources, Chang''an University Xi'an , China
 
Liangt@chd.edu.cn 
cao hongxia Cao Hongxia  
Qiao Xiangyang Yanchang Petroleum Group (Limited Liability) Company Research Institute Xi'an China
 
 
wangkai Yanchang Petroleum Group (Limited Liability) Company Research Institute Xi'an China
 
 
Li Keyong College of Geology and EnvironmentXi’an University of science and TechnologyXi'an  
YuJun College of Geology and EnvironmentXi’an University of science and TechnologyXi'an  
Guo Yanqin School of Earth Science and Engineering,Xi'an Shiyou University, Xi'an  
Abstract:Yan"an area is the main sedimentary area of the Ordovician carbonate-gypsum rock symbiotic system, in which the M543-M532 gypsum deposit of the upper Majiagou Formation is a typical representative of the regressive evaporative environment. Based on field core observation, experimental analysis, drilling and logging data, and on the basis of sedimentary structure, scale of gypsum-salt rock development and lithologic assemblage, the geological characteristics of gypsum-salt rock assemblage in Majiagou Formation of Ordovician in the study area are elaborated in detail.The sedimentary background, sedimentary facies and sedimentary evolution model of the assemblage gypsum-salt rocks in the Majiagou Formation in the study area are systematically summarized. The results are shown below: Under the background of sedimentary pattern of High West and low east, stratum filling is characterized by thin West and thick east, thin South and thick north;Gypsum dolomite-gypsum-salt deposit area from southwest to Northeast; Three types of rock assemblages are vertically developed: type I gypsum dolomite-anhydrite nodule dolomite-gypsum dolomite-mudstone assemblage, type II anhydrite-anhydrite nodule dolomite-gypsum dolomite-mudstone assemblage, type III salt-anhydrite-anhydrite nodule dolomite-gypsum dolomite assemblage; It is a relatively quiet and low-energy lagoon sedimentary model. Evolution of sedimentary environment into extreme evaporative salinization-evaporative gypsum-relative openness.
keywords:Ordos Basin  Ordovician Majiagou Formation  The M543-M532sub-members  Gypsum salt rock  Salt-forming sedimentary mode
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