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鄂尔多斯盆地镇北地区延长组长4+5段沉积期古环境条件及意义
投稿时间:2020-04-08  修订日期:2020-05-11  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2021206
摘要点击次数: 98
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作者单位地址
刘鑫 成都理工大学沉积地质研究院 陕西省西安市未央区凤城四路长庆科技楼1702
尚婷 东华理工大学 
田景春 成都理工大学沉积地质研究院 四川省成都市成华区二仙桥东三路1号成都理工大学沉积地质研究院
王峰 成都理工大学沉积地质研究院 
刘宝珺 成都理工大学 
张晓磊 中国石油长庆油田分公司勘探开发研究院 
徐智 中国石油长庆油田分公司勘探开发研究院 
基金项目:大型油气田及煤层气开发国家科技重大专项(编号2016ZX05050、2017ZX05001002-008)、中国石油天然气股份有限公司科技重大专项(编号2016E-0501)项目
中文摘要:以鄂尔多斯盆地镇北地区三叠系延长组长 4+5 段为研究对象,通过野外露头剖面、钻井岩心共47块泥岩样品的微量元素、稀土元素地球化学分析,运用Sr /Ba、Th/U、Rb/K2O、硼(B)法,钴(Co)法、δU 、V / ( V+Ni) 、V / Cr、Ni /Co、Ce/Ce*、Eu/Eu*、Sr / Cu、Mg/Ca等相关元素比值,定性、定量对长 4+5 段沉积期的“五古”条件(古盐度、古温度、古水深、古气候及古氧化-还原条件)进行了判识。结果表明,长4+5段沉积期古气温介于14.5~24.6℃,为半潮湿-半干燥的温带-亚热带气候;古盐度为陆相微咸水环境,介于0.49‰~ 3.7‰之间;古水温约8.9 ~11.9℃ ;古水深区间介于10 ~ 85 m;沉积物形成于弱还原-氧化条件。相对于延长组长7沉积期来说,长4+5段尽管发育暗色泥岩,但由于环境条件的明显改变,气温升高致使水温增加,水体盐度增大,最终影响有机质发育和保存,不利于该段有效烃源岩的形成。
中文关键词:元素地球化学  镇北地区  延长组长4+5  “五古”条件  鄂尔多斯盆地
 
Paleo-sedimentary environmental conditions and its significance of chang 4+5 member of triassic Yanchang Formation in the Zhenbei area, Ordos basin, NW China
Author NameAffiliationAddress
liuxin Institute of Sedimentary GeologyChengdu University of Technology 陕西省西安市未央区凤城四路长庆科技楼1702
Shang Ting East China University of Technology 
Tian Jingchun Institute of Sedimentary GeologyChengdu University of Technology 四川省成都市成华区二仙桥东三路1号成都理工大学沉积地质研究院
Wang Feng Institute of Sedimentary GeologyChengdu University of Technology 
Liu Baojun Chengdu University of Technology 
Zhang Xiaolei Exploration & Development Research Institute of PetroChina Changqing Oilfield Company 
Xu Zhi Exploration & Development Research Institute of PetroChina Changqing Oilfield Company 
Abstract:Paleo-sedimentary environment of Chang 4+5 Member of Upper Triassic Yanchang Formation in Ordos Basin, including the paleosalinity, paleotemperature, Paleobathymetric, paleoclimate and paleoredox conditions were restored through geochemical element analysis of 47 mudstone samples collected from the outcrop sections around and wells drilled in the basin and using a series of identification indexes of paleo-climate, paleo-salinity and paleo-redox conditions, such as Sr/Ba, Th/U, Rb/K2O, boron (B) method, cobalt (Co) method, U, V/(V+Ni), V/Cr, Ni /Co, Ce/Ce*, Eu/Eu*, Sr/Cu, Mg/Ca and other element ratios. Comprehensive analysis shows that in sedimentary period of the Chang 4+5 member, the paleo-temperature ranged from 14.5 ℃ to 24.6 ℃, with a semi-humid-semi-dry temperate subtropical climate. the paleosalinity was continental brackish water environment, between 0.49 ‰~3.7 ‰. the paleo water-temperature was about 8.9~11.9 ℃, the palaeo water-depth ranged from 10 ~85 m, and the sediments were formed under weak reduction-oxidation conditions. Compared with the sedimentary period of Chang 7 member, although dark mudstone is developed in Chang 4+ 5 member, due to the obvious change of environmental conditions, the increase of air temperature leads to the increase of water temperature and salinity, which ultimately affects the development and preservation of organic matter and is not conducive to the formation of effective source rocks in this period.
keywords:elemental geochemistry  Zhenbei area  Chang 4+5 member of Triassic Yanchang Formation  Paleo-sedimentary environmental conditions  Ordos basin
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