鄂尔多斯盆地两种不同成因古隆起的特征及其在油气勘探中的意义

鄂尔多斯盆地位于华北克拉通西部，是中国大型含油气盆地之一。基底结构复杂，具有明显的不均匀性，基底顸面表现为2个大型隆起，北部为伊克昭盟隆起，中南部为中央古隆起。伊盟隆起具有继承性，继承了结晶基底的形态，上石炭统太原组直接覆盖在变质基底之上。中央古隆起则是盆地西缘和南缘在元古宙秦(岭)祁(连)贺(兰)三又裂谷基础上发育的古元古代被动大陆边缘，并发展成为主动大陆边缘，于中奥陶世—中石炭世秦祁海槽向东、向北方向俯冲碰撞，形成古生代前陆盆地，其前隆部分平面上构成了L形的中央古隆起。

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.