Structural geometry and kinematics of Huanglong anticline,Southeast Ordos Basin
Studying on the structural deformation in the cratonic interior is a key to disclose its tectonic attributes,and an important reference to its oil and gas exploration.The paper utilizes the borehole data and the high-resolution reflection seismic profiles to discuss the structural geometry and kinematics of the Huanglong anticline in the southeastern Ordos Basin.It shows the Huanglong anticline is located at the eastern end of the Weibei uplift,has a length of 18 km,a width of 15 km,and a structural relief of 200 ms in two-way travel time,giving a type of short-axis anticline.It exhibits the similar anticlinal forms from the Changcheng series upwardly to the Triassic Series.Due to the reactivation of the basement normal fault in the Yanshanian tectonic movement period,it is a fault propagation fold,and has a shortening of 70 m and 90 m in its area along the east-westward and the south-northward profiles,respectively.This kind of small shortening indicates the Huanglong anticline is situated at the leading edge of the fold-and-thrust belt of the Yanshanian tectonic movement period,and tends to be dying of the structural deformation.Responding to the tectonic compression from the peripheral tectonic boundaries,the basement normal fault in the cratonic interior inverted and formed an anticline in the sedimentary cover.Owing to the mechanical stratigraphy of the Huanglong anticline,it has a differential shearing in the strata.The Huanglong anticline is a favorable prospect for natural gas exploration.
万方数据
维普
