Genesis and Types of Buried Hills in the Tectonic Setting of the Inheriting Continental Margin in Baiyun Sag,Northern South China Sea
Liu Jun
Peng Guangrong
Zhang Lili
Li Hongbo
Wang Xudong
Wu Zhe
Guan Wei
Liang Chao
Huang Lei
Abstract：The buried hill in the Baiyun Sag is one of the deep-water oils and gas exploration fields in the Pearl River Mouth Basin in the northern South China Sea.However,research on the origin and classification of buried hills is relatively weak,which restricts the evaluation of the oil and gas exploration potential of buried hills.Structural analysis of buried hills in the Baiyun Sag from the perspective of inherited continental margin tectonic background using large-scale 3D seismic data.Mesozoic preexisting structures,Cenozoic detachment fault systems and multiple phases of magmatism,and strike-slip fault systems are identified.The buried hill in the Baiyun Sag is affected by three main controlling factors:pre-existing basement structure,detachment fault and late magmatic transformation.The buried hills in this area can be divided into three types and six subtypes:the geomorphic residual hill dominated by the Mesozoic structure,the extensional fault block dominated by the early Cenozoic structure,and the later modified buried hills.Among them,the thrust residual hill in the northern Baiyun sag,the tilting fault block in the eastern Baiyun sag and the horst and fault blockformed by normal and strike-slip faults of different orientations in the southwestern Baiyun sag have good granite reservoir development conditions,and is the favorable area to search for traps.
Keywords：Northern South China SeaBaiyun Sagburied hillpre-existing structureDetachment faultMagmatismGenesis and types of buried hillspetroleum geology
Publication Date：2025-02-14
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：14( 405-418 )