川东南地区寒武系层序地层厘定及其地质意义

Revision of the Cambrian Sequence Stratigraphy in Southeast Sichuan and Its Geological Implication

寒武系为川东南地区油气勘探的主体层位。根据野外露头特征、岩心样本、录井记录、地震概况及测井资料,对寒武系地层的岩性结构剖面进行初步分析,对层序关键界面识别与划分的标志进行详细描述,将其划分为3个三级层序。根据区内层序地层纵横特征,建立了寒武系的层序地层格架,研究了层序格架中海平面变化与岩溶作用的关系,对风化壳特征及储层研究都有重要指导意义。

The Cambrian is principal oil-gas exploration horizon in southeast Sichuan. This paper deals with lithology and profile texture, sequence boundary and sequence subdivision marks based on outcrop, drilling core and logging data. The Cambrian is divided into 3 third-order sequences. Sequence stratigraphic framework of the Cambrian is established and relationship of eustacy with karstification is studied which is of importance to reservoir and weathered crust.