Tectonic characteristics and evolution of the middle segment of the Jinxi flexure fold belt in the eastern margin of the Ordos Basin
Nowadays,the Jinxi flexure fold belt exists as the remnant eastern boundary of the Ordos Basin.In recent years,rich oil and gas resources such as coalbed methane and tight gas have been found in the Upper Paleozoic Carboniferous-Permian,which is an important exploration field.Based on the field outcrops,drilling,seismic data,etc.,the development and distribution characteristics of the strata are clarified,the regional geological profile is constructed in combination with the shallow outcrops,and the inversion analysis and forward simulation are carried out by 2D-move software,and the tectonic deformation is quantitatively analyzed.The results show that:1)the middle segment of the Jinxi flexure fold belt in the eastern margin of Ordos is mainly affected by the east-west compressive stress and deep tectonic wedge activity in the Yanshan Period,and suffers from strong differential weathering and denudation.The current tectonic pattern has been formed.2)The current length of the section in the study area is about 114.96 km,and the Yanshan Period strata are shortened by about 4.06 km;the strata are uplifted by about 6.12 km;and the strata shortening rate is 3.41%.3)The formation of the middle segment of the Jinxi flexure fold belt is due to the multi-directional compressive tectonic stress,and the main dynamic source is the westward low-angle subduction and extrusion of the Paleo-Pacific Plate.The middle segment of the flexure fold belt is an important tectonic unit with a profound dynamic source,and this paper can provide a reference for the study of the onshore tectonic deformation and evolution characteristics and the direction of oil and gas exploration in the eastern margin of the Ordos Basin.
North China CratonOrdos BasinJinxi flexure fold beltTectonic characteristicsTectonic evolution
万方数据
维普
