牛庄洼陷古近纪浊流沉积中Paleodictyon遗迹化石的发现  

Discovery of Paleodictyon in turbidite deposit of Paleogene in Niuzhuang Sag

作　　者：袁文芳[1] 陈世悦[1] 曾昌民[2] 张关龙[1] 

机构地区：[1]中国石油大学地球资源与信息学院,山东东营257061 [2]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《煤田地质与勘探》2006年第1期8-11,共4页Coal Geology & Exploration

基　　金：国家科技攻关项目(2003BA613A-02)资助

摘　　要：在牛庄洼陷沙河街组四段上亚段的陆相浊流沉积中发现了Paleodictyon遗迹化石,其形态特征几乎和深海分子相媲美,并且在该遗迹化石的宿主岩性中,还发现了可以指示海侵发生的甲藻甾烷分子化石,说明研究区在古近纪曾发生过海侵或与海相关,这不仅为争论了20多年的“渤海湾盆地古近纪是否发生过海侵”问题的解决找到了突破口,同时对油气勘探方向也具有指导意义。Paleodictyon was found in turbidite deposit in the upper of the 4th member （E,4） of Shahejie Formation in Niuzhuang sag and its morphological feature is similar with that in deep marine. Moreover, dinosterane was still discovered in the host lithology of Paleodictyon. Dinosterane is a sign of marine transgression. These indicate that marine transgression happened in Niuzhuang sag or sedimentation of this sag is rehted with marine. This cognition not only provides a firm foundation for settlement of the question ＂whether marine transgression happened or not in Paleogene of Bohai Bay Basin＂, which has been debated for more than 20 years, but also guides the exploration activity.

关 键 词：古近纪 遗迹化石 牛庄洼陷 东营凹陷 

分 类 号：Q911.28[天文地球—古生物学与地层学]