ANALYSIS OF SEQUENCE STRATIGRAPHY FOR TAIKANG-XICHAO AREA OF THE NORTH SONGLIAO BASIN

This paper focused on the application of high-resolution sequence stratigraphy to the formations,i.e.,the second and the third sections of the Qingshankou-Yaojia Formation and the first section of the Nenjiang Formation in Taikang-Xichao area of the North Songliao Basin.Based on the comprehensive study of logging,drilling and seismic information,two scales of stratigraphic cycles (short-term and intermediate-term) can be recognized in the study area.The formations were divided into thirteen chronostratigraphic boundaries,including six sequence boundaries,which were the transformation from base-level fall to base-level rise,and seven lake-flood surfaces,which were the transformation from base-level rise to base-level fall.Then,features of these sequences were described detailed and sequence stratigraphical patterns were analyzed.This will be of guide significance for the discovery of non-structural reservoirs.