摘要
对楚雄盆地地震资料进行解释,在盆地内发现了多条地腹深大断裂,被中生代红层所掩覆,这些隐伏基底断裂与盆缘、盆内控盆基底断裂,共同控制盆地层块分异的构造-沉积演化过程.发现了对中生代盆地沉积具有控制作用的地腹大型隐伏深大断裂——石羊断裂,认为该断裂是楚雄盆地晚三叠世早期滇中裂谷西支——程海—祥云地堑的东边界控制断裂,并重新认识了中生代楚雄盆地性质、形成机制及复杂的构造-沉积演化过程.认为晚三叠世楚雄盆地是经历裂陷-坳陷沉积过程的伸展盆地,建立了晚三叠世挤压构造背景下的裂陷作用与挤压-裂陷盆地模型,落实了云南驿组海相烃源岩分布范围,提出了新的海相目的层系有利勘探目标区.此外,发现了盆地东部寒武系沉积西边界,重新厘定了早寒武世高水位期沉积范围及页岩气勘探有利区域,重新认识了楚雄盆地有利油气保存单元分区,对下一步油气勘探具有指导意义.
Based on the geologic interpretation of 2 D seismic data in Chuxiong basin,the geometrical,the dynamic and kinematic characteristics of the basal controlling faults of the basin or depression are studied.A deepburied large-scale fault which named as Shiyang fault is founded from seismic profiles.The basement fault is believed as the eastern boundary controlling fault of the Yunnan-Chenghai—Xiangyun graben,which is the western branch of the Central Yunnan rift belt during the early Late Triassic,the nature,formation mechanism and complicated tectonic-sedimentary evolution process of the Mesozoic Chuxiong basin are re-understanding.It is concluded that the Late Triassic Chuxiong basin is an extensional basin experienced an evolution course from rifting stage and post-rifting depression stage,the distribution range of Yunnanyi formation of marine source rock is workout.A new favorable exploration of marine target layer target area is proposed.In addition,the western margin of the Cambrian deposits in the eastern part of the basin is founded,the sedimentary range of the early Cambrian as well as the favorable area of the shale gas exploration are re-located.The distribution characteristic,thickness of shale is predicted by means of geophysical method.The favorable hydrocarbon preservation unit is re-understanding,which is of great significance to the exploration and deployment of oil and gas exploration in the next stage.
出处
《云南大学学报（自然科学版）》
CAS
CSCD
北大核心
2017年第S2期287-296,共10页
Journal of Yunnan University(Natural Sciences Edition)
基金
中国石油化工股份有限公司重大项目(G0800-12-KK-214)
中国地质调查局项目(XQ2015-04-02)
关键词
楚雄盆地
隐伏断裂
康滇大裂谷
滇中裂谷
裂陷盆地
地腹构造
Chuxiong Basin
deep-buried tectonics
deep-buried fault
Kangdian continental rift
Central Yunnan rift belt
