松辽盆地北部反转构造特征及对铀成矿的作用

REVERSAL TECTONIC CHARACTERISTICS AND THEIR CONTRIBUTION TO MINERALIZING URANIUM IN NORTH SONGLIAO BASIN

松辽盆地是一个大型平缓的正反转盆地，通过地震资料解释共识别出压性和压扭性2种正反转构造。在深断裂和基底断裂控制下反转构造具有东西分区成带、南北分块的平面分布特征。燕山和喜山构造运动形成了嫩江组末、明水组末和早第三纪末3个构造反转期，其中明水组末期的反转作用最强。受反转构造运动影响，大庆长垣顶部、长春岭背斜带轴部形成得天独厚的规模较大的构造天窗，为含铀含氧水的渗入创造了良好条件，贯穿盆地的黑鱼泡一头台断裂带、齐西一敖古拉一哈拉海断裂带既是良好泄水通道又是深部还原性烃类向上运移进入铀储层的通道。

Songliao Basin is a large-sized fiat basin with two kinds of normal-reversal tectonics interpreted by seismic data： compressional and compresso-shear structures. Controlled by deep faults and basement faults, the reversal tectonics are horizontally characterized by two zones and belts： east and west and furthermore by south and north blocks. Because of Yanshan and Himalayan tectonic movements, three tectonic inversion periods are dated： Late Nenjiang Formation, Late Mingshui Formation and Late Paleogene, and the reversal effect in Late Mingshui Forma- tion is strongest. Influenced by the reversal tectonic movement, unique large-scaled tectonic windows on the top of Daqing Placanticline and Changchunling anticline axis are formed, thus the favorable conditions for uranium ＆ oxygen-bearing water infiltration have created. Qnl-2 and N2 are main oil-generating rocks iyupao-Toutai Fault Zone and Qixi-Aogula-Halahai Fault Belt throughout the basin are not in Daqing Oilfield; Heonly the good discharging channels but the channels of deep original hydrocarbon migrating upward into the uranium reservoir.