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

作　　者：MAO Danfeng HE Dengfa BAO Hongping WEI Liubin XU Yanhua CHENG Xiang GOU Junyi WU Saijun 

机构地区：[1]School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China [2]Research Institute of Exploration and Development under Changqing Oilfield Branch Company,PetroChina,Xi’an,Shaanxi 710018,China [3]Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China

出　　处：《Petroleum Exploration and Development》2023年第4期865-877,共13页石油勘探与开发（英文版）

基　　金：Supported by the Major Science and Technology Project of PetroChina Changqing Oilfield Company (ZDZX2021-01)。

摘　　要：This paper depicts the distribution of the Wushenqi paleo-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 paleo-uplift which developed in the Early Caledonian orogeny(Huaiyuan orogeny) is approximately a 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 11 298 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 Ma 4 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 paleo-uplift 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-coaxial 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：Ordos Basin Wushenqi paleo-uplift Ordovician Majiagou Formation UNCONFORMITY Caledonian orogeny tectonic evolution 

分 类 号：P618.13[天文地球—矿床学]