摘要
渤海湾盆地沙河街组海侵十分频繁.由于海侵作用,为生物群创造了良好的生存环境,进而极大地繁盛起来;蒸发岩类也由此大量形成;沉积环境由氧化环境迅速转为还原环境.海侵作用愈显著,发现的大型油气田愈多,充分说明海侵作用与油气是密切相关的,湖盆经过频繁的海侵,才最有利于油气的生成.
Eogene Shahejie Formation is a major oil source bed in the Bohai Bay bastn. Based on the data of palaeontology, geochemistry, indicating minerals, and C- and O- isotopes, transgressions are quite frequent and notable during the stage of sedimentation.
Because all the depressions in the basin are well closed, two evaporite sedimentary cycles are vertically formed in some of the depressions after the transgressions. Characteristics of evaporite minerals and depositional sequence and distribution of palaeontological species indicate that sediments in depocen-ters are evidently of marine facies and in margins mainly of terrestrial clastic facies.
The more an area experiences transgressions, the more it has great oil-gas, fields. This fully illustrates that oil and gas are closely related to transgressions. A lake basin with frequent transgressions is very favourable for genera-tion of hydrocarbons.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1989年第1期17-28,共12页
Marine Geology & Quaternary Geology
