松辽盆地古生代构造演化

TECTONIC EVOLUTION OF SONGLIAO BASIN IN THE PALAEOZOIC

松辽盆地深层拥有丰富的天然气资源，具备现实的勘探前景。松辽盆地古生代构造演化争议较多，本文通过松辽盆地周边地区构造、沉积和古地理特征，结合盆地内钻井及地球物理资料，认为松辽盆地经过早华力西旋回之后，东北地区的古亚洲域洋壳几乎全部消失，由于佳木斯地块与松嫩地块在早泥盆世完成拼接，额尔古纳地块与松嫩地块于晚泥盆世至早石炭世完成拼接，二叠纪时用该区的构造演化已发展到一个新的演化阶段，石炭纪中期大洋已基本退出该地区，由于后期的伸展和沉降引发大规模的海侵形成一些浅海相或海陆交互相沉积组合，印支期强烈的构造运动使裂陷槽（及洋盆）关闭隆升，并具有西早东晚的特征。至此，东北地区结束了古亚洲构造域的演化历史，取而代之的是滨太平洋大陆边级构造作用逐渐强化．通过该项研究无论对于深层找气，还是对盆地中新生代地层的油气勘探都具有十分重要的地质意义。

There is plenty of gas resources in the deep of Songliao Basin, which can be explored currently. There exists many controveries over tectonic evolution of Songliao Basin in the Palaeozoic. On the basis of analysing of the characteristics of the tectonic ,sedimentation and paleogeography,together with the drilling and geophysics data,the authors get some new opionions. After the Hercynian Cycle, the old Asian oceanic crust in the northeast of Songliao Basin disappeared. The Jiamusi massif mixed with the Songnen massif in the early Devonian, Erguna massif mixed with Songnen massif from Late Devonian to Early Carboniferous. The ocean regressed in the Middle Carboniferous, after which massive transgression experienced because of the extension and the subsidence, which resulted in the sedimentary association of shallow-sea facies and continental-oceanic alternate facies. The tectonic movement during the Indosinian period made the taphrogeosyncline(also ocean basin) closed and uplifted ,which happened early in the west and late in the east. So far the evolution of the old Asian Ocean tectonic domain ended, the Circum-Pacific continental margin tectonic action strengthened gradually. It' s very important for this research to find gas resources in the deep as well as to explore the oil and gas in the Mesozoic and Cenozoic strata.