摘要
根据南沙海域丰富的地球物理资料和调查结果,对南沙海域各盆地区域不整合面及与之对应的构造运动的特征进行了探讨,认为自中生代末期以来本区发生过4次重要的构造运动:礼乐运动、西卫运动、南海运动和南沙运动,它们对南沙海域盆地的形成、沉积和构造演化起到了重要的控制作用.礼乐运动和西卫运动主要表现为拉张性质,礼乐运动造成盆地初始裂离、断陷,西卫运动使盆地断陷、断拗加剧;南海运动使盆地由断拗逐渐转化为拗陷;南沙运动主要表现为挤压性质,该时期所形成的构造圈闭是油气勘探的主要目标.
By using a lot of geophysical data and investigation reports, several unconformities and their accompanied tectonic movements are discussed in all basins of Nansha area, South China Sea. After the latest Mesozoic, there occurred four episodes of tectonic movements, named Lile, Xiwei, Nanhai and Nansha movements respectively, which have important controls over basin development, sedimentation and tectonic evolution in Nansha area. The Lile and Xiwei movements, characterized by regional extension, have resulted in initial basin opening_rifting and intensified basin rifting_faulted subsidence respectively.A gradual transformation from faulted subsidence to sagging took place in basins of Nansha area during Nanhai movement, leading to changes in sedimenary facies. The Nansha movement is characterized by compression, during which local structures are formed and may be key targets for oil and gas exploration.
出处
《中国海上油气（地质）》
2002年第2期113-117,共5页
China Offshore Oil and Gas(Geology)
