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从中新生代以来,中国大陆东部边缘属于构造变动的活跃区.第三纪,尤其是始新世—渐新世,太平洋板块的俯冲方向从北北西转为北西西,在中国的东部海域形成了琉球海沟、琉球岛弧、冲绳海槽的沟、弧、盆体系;在中国东部陆上,郯庐断裂带从中生代的左行平移转变为新生代的右行平移,使断裂带两侧北西—南东向的受力性质从挤压转为拉张;在中国大陆南部,印度板块和欧亚板块的碰撞,雅鲁藏布江的缝合线以及南海小洋盆的形成,使南海大陆边缘的裂谷进一步发展成为拗陷,以上这些构造活动,是形成中国海域含油气盆地的基本因素.至今,沿着盆地的外缘,这种构造活动仍然很活跃.
Since the Mesozoic and Cenozoic, the eastern margin of the Chinese mainland belongs to an active area of structural alteration. In the Tertiary, especially during the Eocene-Oligocene, the subduction direction of the Pacific plate changed from North, West and North to West and formed in the eastern sea of China The Ryukyu Trench, the Ryukyu Island arc, the ditch, arc and basin systems of the Okinawa Trough. In the eastern part of China, the Tanlu fault zone shifted from the Mesozoic left-lateral migration to the Cenozoic right-lateral displacement, In the southern part of mainland China, the collision of the Indian plate with the Eurasian plate, the suture of the Brahmaputra and the formation of the South China Sea’s small oceanic basins have further developed the rift on the margin of the South China Sea to become These tectonic activities are the basic factors for the formation of petroliferous basins in the seas of China, and so far this tectonic activity is still active along the outer margin of the basin.