吉林东部盆地群早白垩世原型盆地恢复

通过区域地质、电法和地震资料等对吉林东部盆地群早白垩世地层、沉积和构造特征进行研究，从而恢复沉积古地理及原型盆地面貌，结合现今勘探成果与原型盆地控制烃源岩展布，残留盆地改造情况，预测有利勘探区。研究结果表明: 该区早白垩世原型盆地为一大型陆相湖盆的一部分，果松组-鹰嘴砬子组沉积期为初始裂陷孤立盆地发展阶段，林子头组沉积期为断坳转换期，沙河子组- 营城组沉积期为统一的坳陷盆地，至登娄库组沉积期原型盆地完全遭到破坏，泉头组沉积期各盆地进入独立发展阶段。靠近原型盆地湖盆中心的( 扇) 三角洲相、河流相及湖沼相沉积区且位于现今盆地的凹陷区是吉林东部盆地群的有利油气勘探区。

Early Cretaceous prototype restoration of the basin group in eastern Jilin

Based on the regional geological data，electrical and seismic data，we research the stratigraphic， sedimentary，tectonic features of Early Cretaceous basin group in eastern Jilin，restoring the sedimentary paleogeography and the visage of prototype basin． Combined with the distribution of hydrocarbon source rocks controlled by the prototype basin and the residual basins transformation in the modern exploration，favorable exploration areas can be predicted． We concluded that prototype basin in this region was a part of a large terrigenous lake basin in Early Cretaceous． Guosong-Yingzuilazi formations sedimentary stage was the initial rifting isolated basin development stage，Linzitou Formation sedimentary stage was a fault-depressed diversionary stage，Shahezi-Yingcheng formations sedimentary stage was the time for unified depression basin，and the prototype basin was totally destroyed in Denglouku Formation sedimentary stage． Since Quantou Formation sedimentary stage，every basin was into an independent development stage． The ( fan) delta facies，fluvial facies and paludal facies deposition areas which near the lake center of prototype basin，and in the depression of present basins are the advantageous areas for oil and gas exploration of the basin group in eastern Jilin．