BALANCED CROSS-SECTION RESTORATION AND TECTONIC EVOLUTION ANALYSIS IN THE BINXIAN SAG, THE SONGLIAO BASIN

Based on strata data analysis,with balanced cross-section technique,choosing 4 NS-trending cross-sections in the Binxian Sag in the east of Songliao Basin,seismic analysis sections are restored in this paper.Extension quantity,rate and velocity for each evolution stage are calculated.The Binxian Sag has experienced at least 4 evolution stages:fault,fault-depression,depression and tectonic inversion.Results have indicated that,extension velocities during the fault and fault-depression stages are higher,about 0.21 and 0.2 mm/a respectively.Deformation intensity in the center of Binxian sub-Sag is stronger than the margin.