靖边气田高桥区奥陶系古地貌恢复研究

Study on Palaeogeomorphologic Reconstruction of the Ordovician in Gaoqiao Block of Jingbian Gas Field

古地形地貌岩溶储层与古地貌圈闭密切相关,对后期油气藏形成具有控制意义。鄂尔多斯盆地于加里东运动晚期整体抬升,使得奥陶系下古生界岩层暴露地表,进而遭受严重剥蚀。因此开展前石炭系奥陶系古地貌恢复研究工作对寻找油气田具有指导意义。作者从沉积学角度出发,主要利用残余厚度法、印模法等,对靖边气田高桥地区马五1+2顶面进行了古地貌的恢复研究。

Ancient topography karst reservoirs are closely related to traps palaeogeomorphology, and have control significance for formation of the late reservoirs. Ordos basin overall uplifted in the late Caledonian, which made Ordovician Lower Paleozoic rocks expose to the surface, and thus suffer serious erosion. Therefore, research on Carboniferous Ordovician Land Restoration has guiding significance for finding oil and gas fields. In this paper, from the perspective of sedimentology, the ancient landscape restoration of Mawu 1 ＋2 top faces in Gaoqiao block of Jingbian gas field was studied by using the residual thickness method and moldic method.