高邮凹陷深凹带戴南组古生物特征及环境意义

doi:10.11885/j.issn.1674-5086.2016.06.29.02

西南石油大学学报(自然科学版) ›› 2018, Vol. 40 ›› Issue (1): 11-21.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

袁静^1,2, 肖运凤^1,2, 董道涛^1,2, 熊光勤³, 仇永峰³

1. 中国石油大学(华东)地球科学与技术学院, 山东青岛 266580;
2. 青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室, 山东青岛 266071;
3. 中国石化江苏油田分公司, 江苏扬州 225012

收稿日期:2016-06-29 出版日期:2018-02-01 发布日期:2018-02-01
通讯作者: 袁静,E-mail:drjyuan@163.com
作者简介:袁静,1972年生,女,汉族,山东肥城人,教授,博士,主要从事储层沉积学和储层地质学领域的科研和教学工作。E-mail:drjyuan@163.com;肖运凤,1991年生,女,汉族,山东肥城人,硕士研究生,主要从事沉积学和储层地质学方面的研究工作。E-mail:782865125@qq.com;董道涛,1989年生,男,土家族,湖南张家界人,博士研究生,主要从事沉积学和储层地质学方面的研究工作。E-mail:daotao1989@foxmail.com;熊光勤,1967生,女,汉族,安徽六安人,教授级高级工程师,硕士,主要从事油田地质研究及科研管理工作。E-mail:xionggq.jsyt@sinopec.com;仇永峰,1982年生,男,汉族,甘肃平凉人,副主任师,主要从事油气勘探方面的研究工作。E-mail:qiuyf.jsyt@sinopec.com
基金资助:
中国石化科技攻关项目（P13125）

Paleontological Features and Sedimentary Environment of Dainan Formation in Deep Sag of Gaoyou Sag

YUAN Jing^1,2, XIAO Yunfeng^1,2, DONG Daotao^1,2, XIONG Guangqin³, QIU Yongfeng³

1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China;
2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China;
3. Geological Scientific Research Institute of Jiangsu Oilfield, SINOPEC, Yangzhou, Jiangsu 225012, China

Received:2016-06-29 Online:2018-02-01 Published:2018-02-01

摘要/Abstract

摘要： 充分利用岩芯和古生物分析资料，结合沉积相研究成果，对高邮凹陷深凹带戴南组一段-二段5亚段的介形虫和轮藻化石及其沉积环境的关系进行系统研究。识别出介形虫70个属种，统计显示以金星介科分子为主，其次是玻璃介科分子，还有少量胡花介科分子，其化石组合的垂向变化反映了戴南期湖泊水体从半咸水→淡水-微咸水→半咸水→淡水的旋回性变化。发现轮藻化石76个属种，主要有常州厚球轮藻、强壮冠轮藻、长柱形钝头轮藻、小球状轮藻等，其中以戴一段一亚段最为繁盛，表明当时较为稳定的半咸水-淡水沉积环境。介形虫化石组合和轮藻化石的垂向分布和演化与沉积环境、沉积相变迁和分布具有密切关系。介形虫组合以淡水-微咸水环境中的属种占优势，且轮藻勃发时，反映陆源碎屑物质供给充足，沉积相以加积型或进积型三角洲和扇三角洲为主；当介形虫组合以半咸水环境中的属种占优势时，表明陆源碎屑物质供给较弱，沉积相以退积型三角洲和扇三角洲为主。

关键词: 高邮凹陷, 戴南组, 古生物特征, 古水体, 沉积环境

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 changzhouensis, S tephanochara fortis, Obtusochara longscoluminania, 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.

Key words: Gaoyou sag, Dainan Formation, paleontological feature, paleo-water body, sedimentary environment

中图分类号:

TE122

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.

YUAN Jing, XIAO Yunfeng, DONG Daotao, XIONG Guangqin, QIU Yongfeng. Paleontological Features and Sedimentary Environment of Dainan Formation in Deep Sag of Gaoyou Sag[J]. 西南石油大学学报(自然科学版), 2018, 40(1): 11-21.

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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

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