论文部分内容阅读
北部湾拗陷位于海南岛西面,目前为一半封闭浅海区,拗陷在前白垩系基底上发育起来,接受中、新生代沉积约3—4千米。笔者在拗陷的钻井岩芯中发现浊积岩。该凹陷长轴北东东向,南北缘有同生断层发育,钻井位于北部同生断层南面的断层上盘。岩芯表明,上第三系为浅海相沉积,下第三系缺少标准化石,按岩性分三个岩组:下部红色岩组,中部暗色岩组和上部杂色岩组。浊积岩系位于暗色岩组的下段(图1)。
Beibuwan Depression is located in the west of Hainan Island. Currently, it is half closed shallow sea area. Depression developed on the former Cretaceous basement and accepted Meso-Cenozoic sediments about 3-4 km. The author found turbidite in the core of the depressed drilling core. The long axis of the depression is NE-trending and the north-south margin has symbiotic faults. The drilling is located on the upper part of the fault in the northern Tongsheng fault. The cores show that the Upper Tertiary was a shallow marine facies, the lower Tertiary lacked standard fossils and was divided into three rock groups according to lithology: the lower red rock group, the middle dark rock group, and the upper variegated rock group. Turbidite is located in the lower part of the dark-colored rock group (Figure 1).