Structural Segmentation of the Foreland Thrust Belt and Its Relations to Hydrocarbon in the Southern Margin of Junggar Basin
准南前陆冲断带构造分段及其与油气关系

Characteristics of structural segmentation of the foreland thrust belt in the southern margin of Junggar basin were studied on the basis of a comprehensive analysis of geological outcrops as well as seismic and geophysical data.It is concluded that the main factors inducing structural segmentation in this area are attributed to large-sized basement faults,namely,Urumqi-Miquan fault and Hongche fault,whose formation and evolution determined separately the appearance and/or disappearance of the characteristics of structural segmentation,and that the main factors inducing structural sub-segmentation are attributed to the transfer zones which extend in the directions of NW and NE-NEE in the basin margin.The structural segmentation has played an important role in controlling the hydrocarbon in such aspects as the formation and distribution of source rock and source-reservoir-cap assemblages,and the periods of migration and accumulation of hydrocarbon within different structural segments.