西南石油大学学报（自然科学版）2018，Vol.40Issue(1)：11-21,11.DOI:10.11885/j.issn.1674-5086.2016.06.29.02
高邮凹陷深凹带戴南组古生物特征及环境意义
Paleontological Features and Sedimentary Environment of Dainan Formation in Deep Sag of Gaoyou Sag
摘要
Abstract
Based on rock core and paleontology analyses data,combined with the sedimentary facies,the relationship between fossils,such as ostracods and charophytes,and the sedimentary environment of the first and second members of the fifth sub-member of the Dainan Formation in the Deep Sag of Gaoyou Sag were systematically analyzed.Seventy species of ostracods were identified,with the Cyprididae Baird section molecules being dominant,followed by Candonidae Kaufmann,and a small number of Limnocytheridae.The vertical variation in the fossil assemblage reflects the cyclic changes in the lake water during the Dainan Period,namely,brackish water→fresh water→brackish water→brackish water→fresh water.In addition,76 species of charophytes were identified,including Grovesichara chanqzhouensis,S tephanochara fortis,Obtusochara lonqscoluminania,and Sphaerochara parvula.The first sub-member of the first member of the Dainan Formation is most prosperous,which manifests a quiet and brackish-fresh water environment during those periods.The vertical distribution and evolution of the ostracods and charophytes fossil combination has a close relationship with the changes in and distribution of the sedimentary environment and facies.When the ostracods fossil assemblage in fresh to brackish water is in a dominant position and the chara is flourishing,it indicates that terrigenous clastic sediment is abundant.Additionally,the sedimentary facies are dominated by aggradation or a progradation delta and fan delta.When the ostracods fossil assemblage in brackish water is in a dominant position,it indicates that the terrestrial sources are short of clastic substance supply,and the retrogradation delta and fan delta are the main sedimentary facies.关键词
高邮凹陷/戴南组/古生物特征/古水体/沉积环境Key words
Gaoyou sag/Dainan Formation/paleontological feature/paleo-water body/sedimentary environment分类
能源科技引用本文复制引用
袁静,肖运凤,董道涛,熊光勤,仇永峰..高邮凹陷深凹带戴南组古生物特征及环境意义[J].西南石油大学学报（自然科学版）,2018,40(1):11-21,11.基金项目
中国石化科技攻关项目(P13125) （P13125）
