论文部分内容阅读
珠江口盆地燕山期花岗岩地球化学、地球物理等特征分析表明,其形成缘于中生代太平洋板块向华南大陆的俯冲,并引起华南大陆边缘岩石圈等温面上隆及上地壳硅铝质岩石的多次重熔。花岗岩层形成后的区域性剥蚀作用导致盆地隆起部位花岗岩穹窿和背斜的形成;此后,新生代沉积物覆盖在花岗岩背斜和穹窿之上并形成披覆背斜,该类构造为珠江口盆地重要的含油气构造类型。在中生代时,东沙隆起及其以北具有高地温场,花岗岩发育的特点;南部坳陷带则表现低地温场和中生代沉积等特点。中生代烃源岩演化程度相对较低,它在新生代时期具备二次生烃的可能性。
The analysis of the geochemistry and geophysics of the Yanshanian granitoids in the Pearl River Mouth Basin shows that the formation of the Yanshanian granite is due to the subduction of the Mesozoic Pacific plate to the South China continent and the upwelling of the lithosphere isotherm and the upper crustal Si-Al rock in the margin of the South China Continent Remelting. The regional denudation after granite formation led to the formation of granite domes and anticlines in the uplift of the basin. After that, the Cenozoic sediments covered the anticline and dome of the granite and formed a drape anticline. This kind of structure is composed of the Pearl River Mouth Basin Important types of petroliferous structures. During the Mesozoic Era, the Dongsha uplift and its north have the characteristics of high geothermal field and granite development. The southern depression zone is characterized by low geothermal field and Mesozoic sediments. The evolution of Mesozoic source rocks is relatively low, which possesses the possibility of secondary hydrocarbon generation during the Cenozoic.