Two different genetic types of paleouplift in the Ordos basin and its significance in oil and gas exploration

The Ordos basin located in the west part of the North China craton is one of the large petroleum-bearing basins. It has a complex and obviously heterogeneous basement structure with two large uplifts on top of the basement. The northern one is called the Yimeng paleouplift, and the south-central one, the Central paleouplift. The Yimeng paleouplift inherits the shape of the crystalline basement, with the Upper Carboniferous directly covering the metamorphosed basement; whereas the Central paleouplift is the Paleoproterozoic passive continental margin that originated from the western and southern margins of the Ordos basin on the basis of the Proterozoic Qinling-Qilian-Helan triple rifts and developed as an active continental margin. During the Middle Ordovician to Middle Carboniferous, the Qinling-Qilian ocean trough was subducted and collided in east and north directions, thus forming the Paleozoic foreland basin, and its front bulge formed the L-shaped Central paleouplift.