Analysis of regional structural cross section in the northern section of the western edge of the Ordos Basin and new insights into Qipanjing syncline structure
The western margin thrust belt,as a transitional area of numerous structural units with different properties in the western boundary of the Ordos Basin,has complex geological characteristics.In recent years,the exploration field of oil and gas in the western margin thrust belt has been continuously expanding.Multiple tectonic movements have affected the entire process of oil and gas generation,migration and accumulation,and destruction.The study of the styles and processes of structural deformation caused by these tectonic movements can lay a foundation for further oil and gas exploration.This article selects a newly processed high-precision 2D seismic survey line in the northern section of the western edge of the Ordos Basin,and combines drilling and outcrop data to finely analyze and characterize it.The 2D-move software is used to perform inversion and forward modeling of its structural evolution.The results indicate that:1)the syncline structure in the Qipanjing Town area of the northern section of the western edge of the Ordos Basin is formed by the eastward movement of the basement composite tectonic wedge,and the thickening of the strata in the syncline core is related to the activity of the Zhuozi Mountain-Hengshanbu fault.2)The current length of the structural geological profile passing through the northern section of the western edge of Ordos Basin is 120 km.After inversion and balance restoration,the profile length is 137.68 km,with a cumulative structural shortening of about 17.86 km and an overall structural shortening rate of about 13%.Among them,the Yanshanian had the largest shortening,with a shortening amount of about 12.72 km and a shortening rate of 10%.3)According to the geological contact relationship and structural evolution simulation,it can be inferred that the formation time of the Qipanjing syncline was roughly in the middle of the Yanshanian,and the Yinchuan area was a high-altitude uplift during this period.
Western margin of Ordos BasinQipanjing synclineTectonic wedgeTectonic evolution
万方数据
维普
