Abstract:

The analysis of basin subsidence history and buried history are important part of hydrocarbon appraisement.According to the well logging data of south Songliao basin,on the basis of formation denude, the authors evolved the research on deposition rate, subsidence rate and buried history. The simulation of deposition rate and the subsidence rate indicate that the deposition rate and the subsidence rate of the Shahezi Formation,the Yingcheng Formation is the rapidest, the Quantou Formation,the Mingshui Formation is high,and the Denglouku Formation,the Qingsankou Formation,the Yaojia Formation,the Sifangtai Formation is low;the finding of the buried history make known the significance that fast deposition,fast subsidence and fast burial  from the Shahezi Formation to the Yingceng Formation.The strata is denuded in the Late Yingcheng  Formation, stratigraphic break and denudation present increasingly tendency from west to east; the significance of buried history is the more fast deposition,subsidence and interment. From the Denglouku Formation to the Mingshui Formation, the subsidence stay entire from the Yaojia Formation,the strata from upper the Nenjiang Formation to the Mingshui Formation denudation acutely. The strata basically absent in the southeast uplift of the basin from The NengjiangⅢ Formation to the Mingshui Formation.From the Paleogene to the Neogene,the overall significient present that strata uplift slowly,then fall slowly, deposition slowly, bury slowly.

Key words: the southern Songliao basin, buried history, denudation, deposition rate, subsidence rate