摘要
中白垩世非海相沟鞭藻化石在世界上极为罕见。松辽盆地泉头组三段——姚家组发现具有特殊面貌的沟鞭藻组合,属于生存于湖泊中的非海相化石,在国内是首次报道;重新解释了目前世界最大陆相油田油气生成时期的古松辽湖泊的性质。沟鞭藻类化石的垂向变化反映了一个完整的海进海退过程,湖水由微咸—半咸—微咸—淡和水温由凉—暖的变化。古松辽湖是一个开口湖,赛诺曼期最大海侵时,由于海侵,古松辽湖通过古松花江与古东亚细亚海相通,海水进入湖泊。因此,古松辽湖与今日马拉开波湖相似。
ABSTRACT Non-marine dinoflagellate fossil of middle cretaceous is very rare in the world.The dinoflagellate assemblage with unique features discovered in Member 3 of Quantou Formation-Yiaojia Formation belong to the mon-marine fossils living in lakes. This is their first discovery in China, which renews the interpretation of characteristics of the Songliao palaeo-basin in hydrocarbon generation stage of the largest continental oilfield in the world. The vertical variation of the dinoflagellate fossils in assemblage reflacts a complte transgression-to-regression process and the corresponding lake-water change of brackish to fresh and a water temperature variation of cool to warm. The Songliao palaeo-basin was an open lake. During the biggist transgression at Cenoman stage, the palaeo-lake connected with eastern Asian palaeo-sea through palaeo-Songhuajiang river and due to the sea flood, the sea water entered into the lake. The Songliao palaeo-lake, therefore, is similar to the present-day Lake de Maracaibo.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
1989年第3期35-41,共7页
Petroleum Geology & Oilfield Development in Daqing
关键词
松辽盆地
沟鞭藻
化石
生油环境
: Songliao Basin, non-marine, dinoflagellate fossil
