学术
大庆油田徐22井青山口组／姚家组微体生物及其古气候响应
崔莹[1,2] 席党鹏[1] 万晓樵[1]
[1]中国地质大学地球科学与资源学院,北京100083 [2]沈阳大学旅游与地理科学学院,辽宁沈阳110044
摘 要:
对大庆油田徐22井青山口组／姚家组界线上下约12．20m长的岩心做了详细采样、描述，进行了孢粉、介形类化石的处理、鉴定和分析，以恢复界线上下的古环境和古气候。研究表明，采样段底部沉积期主要出现一种相对深水还原的沉积环境，介形类、水源和陆源生物均比较繁盛，孢粉Cyathidites类型占优势，显示出一种相对温暖湿润的气候；向上岩层颜色变浅，粒度有所加粗，化石含量迅速减少，反映出沉积水体急剧变浅，气候变得比较干热，生物受到打击，在1612．90m界线处介形类化石完全消失，孢粉含量也急剧减少；再向上岩性明显变粗，并出现红层，反映当时湖水变得很浅，可能为三角洲淤积相，气候更加干热，并有波动，化石很少见。因此可以看出在界线上下热带、湿润一半湿润气候的大背景下，水体由深而平静变得浅而动荡，气候由相对温暖湿润变得相对干热，生物出现由繁盛到衰退的变化过程。[著者文摘]
文章出处:
《现代地质》-2007年21卷3期 -484-490页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
1000-8527（2007）03-0484-07
Microbiostratigraphy and Paleoclimate Change from Upper Qingshankou to Lower Yaojia Formations in Well Xu-22 of Daqing Oilfield
CUI Ying, XI Dang-peng , WAN Xiao-qiao （ 1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China ; 2. College of Tourism and Geography, Shenyang University, Shenyang, Liaoning 110044, China）
Abstract:
Detailed sample collections and descriptions have been made from upper Qi formations in well Xu-22 of Daqing Oilfield. The thickness of collected well core is 12 ngshankou to lower Yaojia 20 m. Careful identification and analysis on sporopollen and ostracods fossils have been carried out. Microbiota from the upper part of Qingshankou Formation refers to a deepwater and disoxidation environment. There are large amount of ostracods and other biota. The sporopollen Cythidites is dominant. This shows a relatively warm and moist climate. The color of upper layers turns light, the granularity turns large and the fossil abundance reduces rapidly. This shows the lake became shallower, the climate was drier and heater, and the creatures were suffered by disaster. At the boundary of 1,612. 90 m, ostracods completely vanished, and the sporopollen number decreased. Sediments in upper layers become coarse and red. This shows that the lake was shallow, maybe in a delta-silted phase. The climate became more and more dry and heat, and fluctuated frequently, and fossils were rare. Generally, at the boundary , the climate turned to drier and heater from moist and warm conditions; the water became shallower and more fluctuant upwards; as a result, biota declined their abundance rapidly under the climate change.[著者文摘]
Key words:
Qingshankou and Yaojia formation ; sporopollen ; ostracods ; paleoclimate ; Daqing Oilfield
基金资助:
国家重点基础研究发展计划项目（2006CB701403）;国家自然科学基金项目（40472011,40672020）.致谢：衷心感谢中国地质科学院王大宁研究员在孢粉化石鉴定方面给予的指导和建议,感谢中国地质科学院柳永清研究员在孢粉样品处理中给予的帮助.
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