Discovery of Late Cretaceous foraminifera in the Songliao Basin: Evidence from SK-1 and implications for identifying seawater incursions  

作　　者：XI DangPeng WAN XiaoQiao FENG ZhiQiang LI Shun FENG ZiHui JIA JianZhong JING Xia SI WeiMin 

机构地区：[1]School of Earth Science and Resources, China University of Geosciences (Beijing), Beijing 100083, China [2]Exploration and Development Research Institute of Daqing Oil Field Company, Daqing 163712, China

出　　处：《Chinese Science Bulletin》2011年第3期253-256,共4页

基　　金：supported by the National Basic Research Program of China (2006CB-701403);the National Natural Science Foundation of China (40872016);the Graduate Innovative Research Fundation of China University of Geosciences (Beijing)

摘　　要：The Songliao Basin is the largest oil-bearing basin in China.In the absence of sufficient evidence,the possibility of seawater incursion(s) into the Songliao Basin remains controversial.Recently,we discovered relatively abundant foraminifera fossils from units 1 and 2 of the Nenjiang Formation of borehole SK-1.Benthic foraminifera (Gavlinella sp.,Anomalinoides sp.,Pullenia sp.,Haplophragmoides sp.,Karrorulina hokkaidoana,Clavulinoides sp.),as well as planktonic foraminifera (Archaeoglobigerina blowi,Archaeoglobigerina cretacea and Hedbergella flandrini),were identified.These fossils were widely distributed in the marine Cretaceous.According to the global distribution of the above-mentioned planktonic foraminifera,the age of these fossil bearing strata appears to be Late Coniacian to Santonian.More importantly,these foraminifera provide direct evidence for marine water incursions into the Songliao Basin during deposition of the Lower Nenjiang Formation.The Songliao Basin is the largest oil-bearing basin in China. In the absence of sufficient evidence, the possibility of seawater incursion（s） into the Songliao Basin remains controversial. Recently, we discovered relatively abundant foraminifera fossils from units 1 and 2 of the Nenjiang Formation of borehole SK-1. Benthic foraminifera （GavlineUa sp., Anomalinoides sp., Pullenia sp., Haplophragmoides sp., Karrorulina hokkaidoana, Clavulinoides sp.）, as well as planktonic foraminifera （Archaeoglobigerina blowi, Archaeoglobigerina cretacea and Hedbergellaflandrini）, were identified. These fossils were widely distributed in the ma- rine Cretaceous. According to the global distribution of the above-mentioned planktonic foraminifera, the age of these fossil bearing strata appears to be Late Coniacian to Santonian. More importantly, these foraminifera provide direct evidence for marine water incursions into the Songliao Basin during deposition of the Lower Nenjiang Formation.

关 键 词：有孔虫化石 松辽盆地 海水入侵 晚白垩世 证据 水库 浮游有孔虫 底栖有孔虫 

分 类 号：P618.130.2[天文地球—矿床学] Q915.811.1[天文地球—地质学]