鄂尔多斯盆地乌审旗古隆起的分布、演化及构造属性  

Distribution,evolution and structural properties of Wushenqi paleo-uplift in Ordos Basin

作　　者：毛丹凤 何登发[1] 包洪平[2] 魏柳斌[2] 许艳华 成祥 苟钧壹 武赛军[3] MAO Danfeng;HE Dengfa;BAO Hongping;WEI Liubin;XU Yanhua;CHENG Xiang;GOU Junyi;WU Saijun(School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;Research Institute of Exploration and Development under Changqing Oilfield Branch Company,PetroChina,Xi’an,Shaanxi 710018,China;Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China)

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国石油长庆油田公司勘探开发研究院,西安710018 [3]中国石油勘探开发研究院,北京100083

出　　处：《石油勘探与开发》2023年第4期755-766,共12页Petroleum Exploration and Development

基　　金：中国石油长庆油田公司科技重大专项“鄂尔多斯盆地中元古界—奥陶系构造沉积演化、成源机制与勘探新领域”(ZDZX2021-01)。

摘　　要：基于最新钻井与地震资料,对鄂尔多斯盆地乌审旗古隆起的分布进行刻画,同时采用Bischke曲线、平衡剖面方法分析其形成演化。结果表明,乌审旗古隆起为加里东早期形成的挤压型古隆起,平面呈南北向展布的椭圆状,长轴约194 km,短轴近东西向,长55~94 km,核部寒武系被剥蚀的厚度与面积分别为170~196 m和11298 km^(2);利用年代地层格架剖面分析古隆起主体形成时间为怀远运动时期;中—晚寒武世为乌审旗隆起雏形期,晚寒武世末期隆起显著发育后被剥蚀,至奥陶纪马家沟组马三段沉积期隆起发生继承性活动,隆起面积减小,马四段沉积期—石炭系沉积前古隆起区地层发生非均一性抬升并遭受剥蚀,石炭纪及其之后进入埋藏保存的稳定期。乌审旗古隆起是在基底与构造薄弱带之上形成的,并受南部、北部的非共轴挤压以及盆内隆起传递的应力影响,发育成形态不规则的挤压型古隆起,该古隆起对沉积储集层和油气聚集具有一定控制作用。This paper depicts the distribution of the Wushenqi palaeo-uplift in the Ordos Basin by using the latest drilling and seismic data,and analyzes the tectonic evolution of the paleo-uplift with the support of Bischke curve and balanced section.The compressional Wushenqi palaeo-uplift which developed in the Early Caledonian orogeny(Huaiyuan orogeny)is approximately a flat ellipse extending in S-N direction.Its long axis is about 194 km and short axis is about 55–94 km in nearly W-E direction.The denudation thickness and area of the Cambrian in the core are 170–196 m and 11298 km^(2),respectively.It was mainly formed during the Huaiyuan orogeny according to the chronostratigraphic framework.It was in the embryonic stage in the Middle–Late Cambrian,denuded after developed obviously at the end of Late Cambrian.The paleo-uplift of the 3rd member of the Ordovician Majiagou Formation was reactivated and reduced in area.In the sedimentary period of the Ma4 Member–pre-Carboniferous,the paleo-uplift experienced non-uniform uplift and denudation.It entered the stable period of burial and preservation in the Carboniferous and later period.The Wushenqi paleouplift was formed on the weak area of the basement and tectonic belts,into an compressional structure with irregular morphology,under the control of the non-axial compression in the south and north and the stress transmitted by the uplift in the basin.The Wushenqi paleo-uplift has a controlling effect on the sedimentary reservoirs and hydrocarbon accumulation.

关 键 词：鄂尔多斯盆地 乌审旗古隆起 奥陶系马家沟组 不整合 加里东运动 构造演化 

分 类 号：TE122.2[石油与天然气工程—油气勘探]