摘要
万安盆地为新生代发育于减薄陆壳之上的走滑拉张盆地，基底主要由中生代花岗岩类与变质岩组成，经历了早第三纪张裂与晚第三纪裂后两个发育阶段，张裂阶段断陷期沉积了厚达6100m的河湖相－海陆交互相与半封闭浅海相沉积，裂后期为大规模海进期，沉积了厚达4000m的浅海－半深海相沉积，巨厚的新生代沉积奠定了形成大型含油气盆地的基础。盆地内大规模的基底块断活动形成了三隆四坳的构造格局，控制了各类圈闭的发育，以与基岩有关的继承性圈闭最为重要，具有极为良好的油气勘探前景。
The Wan'an Basin is a Cenozoic striking-slip extensional basin developed on the thinning con
tinental crust, with basement consisting of Mesozoic granite and metamorphic rocks. The basin
has experienced rifting stage and post-rifting stage in Paleogene and Xeogene times respectively. It
had filled 6100m thick sediments of fluo-lacustrine-transitional and semi-enclosed shallow marine
facies during rifting stage, and deposited 4000m thick sediments of shallow marine-bathyal facies
during post-rifting stage with large size transgress. Therefore, the giant thick Cenozoic sediment
is the foundation of forming large size petroliferous basin.
Within the basin, the large basement block-faulting caused the structure framework of three
uplifts and four depressions, and controlled the various traps development. The favorable trap
pattern in the basin is the inherited one associated with basement, which has close relation with
various types of petroleum system and has great hydrocarbon exploration potential.
出处
《中国海上油气（地质）》
1997年第2期72-79,共8页
China Offshore Oil and Gas(Geology)
