天然气地球科学 ›› 2022, Vol. 33 ›› Issue (5): 807819.doi: 10.11764/j.issn.1672-1926.2021.12.011
Zhenglin CAO(),Pan LI(),Ruiju WANG
摘要:
对应晚二叠世—早三叠世地球系统转换期(简称P—T转换期),准噶尔盆地玛湖凹陷P3-T1经历了从前陆冲断向整体拗陷的转变,发育T1/P、P3w/P2w 2期大型不整合及上乌尔禾组(P3w)、百口泉组(T1b)2套退覆型低位沉积,形成了一批大型—特大型砾岩油田。针对T1/P和P3w/P2w 2个三级层序界面,识别出与构造挠曲和侵蚀作用相关的2类坡折带:构造挠曲坡折带受控于持续性古隆起,控制层序界面之上地层向斜坡高部位逐层“单向超覆”,侵蚀坡折带受控于古残丘,控制层序界面之上地层向古残丘“双向超覆”或沿下切沟谷低位充填。2类坡折带均控制地层沉积变化,有利于形成上倾超覆型、低位充填型和地层削截型岩性地层圈闭。研究成果对于指导古地貌背景坡折控制下的大型岩性地层油气藏勘探具有重要意义。
中图分类号:
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