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• 地质与资源 •    下一篇

东北地区晚古生代构造-沉积特征与油气资源

张兴洲,周建波,迟效国,王成文,胡大千   

  1. 吉林大学 地球科学学院,长春 130061
  • 收稿日期:2008-07-25 修回日期:1900-01-01 出版日期:2008-09-26 发布日期:2008-09-26
  • 通讯作者: 张兴洲

Late Paleozoic Tectonic-Sedimentation and Petroleum Resources in Northeastern China

ZHANG Xing-zhou, ZHOU Jian-bo, CHI Xiao-guo, WANG Cheng-wen, HU Da-qian   

  1. College of Earth Sciences,Jilin University,Changchun 130061, China
  • Received:2008-07-25 Revised:1900-01-01 Online:2008-09-26 Published:2008-09-26
  • Contact: ZHANG Xing-zhou

摘要: 东北地区晚古生代的构造属性一直被认为是海西期褶皱带或碰撞造山带,长期以来它被作为中、新生代盆地的变质结晶基底成为油气勘查的禁区。新的研究结果表明:东北地区各地块在500 Ma左右发生一次重要的陆壳固结事件;泥盆-早石炭世东北各地块沿嫩江-扎赉特一线拼合形成统一的复合地块(佳木斯-兴蒙地块)。晚古生界是复合地块基底之上的第一个具有区域性分布的准盖层沉积;晚古生界以海相沉积为主,化石丰富,保存完好,岩石没有遭受区域变质作用,其主体处于高级成岩阶段;大面积分布的花岗岩主体形成于中生代(220~180 Ma),而不是海西期。岩相古地理特征显示,晚石炭-二叠纪沉积环境是一个规模巨大、南与古亚洲洋相连的海相沉积盆地,以松辽和二连为代表的中、新生代裂谷盆地是在晚古生代海相沉积盆地背景上发展起来的。因此,晚古生界不是松辽盆地和二连盆地的变质结晶基底,它们是一种叠合盆地关系。鉴于晚古生界潜在的烃源岩发育和叠合盆地特点,东北地区晚古生界具有巨大的油气资源潜力,应成为深部油气资源勘探的重要新层系。

关键词: 东北地区, 晚古生界, 叠合盆地, 油气新层系

Abstract: Geotectonically, Tectonic setting in NE China during the Late Palaeozoic is traditionally referred to as a Variscan fold belt or orogenic belt. Therefore Late Palaeozoic rocks as a basement of Mesozoic-Cenozoic basins are regarded to be impossible for hydrocarbon exploration. Our recent studies indicate that a crust consolidating event occurred in the individual massifs in NE China in 500 Ma(±). The consolidated massifs amalgamated along the east margin of Daxing’anling Mountain, forming a composite massif as an independent evolution unit (we re-named Jiamusi-Xingmeng massif).The Late Palaeozoic Group is the first regional sedimentary cover on the composite massifs, which consists of marine sediments with abundant of well-preserved fossils. It is noteworthy that the Late Palaeozoic group is not subjected to the regional metamorphism and associated granites with large areas are not formed in Variscan, but Mesozoic time (220-180 Ma). Palaeogeographic features show that sediment setting of Late Carboniferous-Permian was a huge marine basin facing Paleo-Asian Ocean in south. The Mesozoic-Cenozoic lift basins represented by Songliao and Erlian basins are developed on the base of the Late Paleozoic marine sedimentary basin. Thus we suggest that the Late Palaeozoic sediments are not the metamorphosed basement in the Mesozoic-Cenozoic basins, they are superimposed basins. So the Late Palaeozoic group in NE China has tremendous potential for oil and gas resources, and should be an important new area for deep hydrocarbon exploration.

Key words: Northeastern China, Late Palaeozoic Group, superimposed basin, new area for hydrocarbon exploration

中图分类号: 

  • P618.13
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