Analysis of the mesozoic-cenozoic subsidence history in Chepaizi Area, Junggar Basin

Based on the typical seismic profiles of Chepaizi area, its subsidence history has been analysed by the EBM basin modelling system. The results indicate that the subsidence of Chepaizi area was controlled by Chepaizi uplift, and the centers of subsidence were in the east and south parts of the research area in Mesozoic-Cenozoic period. With the activity of Chepaizi uplift calming down, the subsidence centers trans-ferred and mainly distributed in the south. The further researches indicate that three episodes of overthrust-ing and compression controlled the subsidence of Chepaizi area. The subsidence rate evolved from high to low during each episode, which reflected the relaxation of tectonic compression stress. Based on the analysis, it indicates that both of the subsidence centers and tectonic movements controlled the sequencestratigraphic pattern, and the binary system tracts which grow in forebulge and back-bulge unit of foreland basin are the dominant sequence-strati-graphie patterns in Chepaizi area.