鄂尔多斯盆地东南部黄龙背斜的构造几何学与运动学  

Structural geometry and kinematics of Huanglong anticline, Southeast Ordos Basin

作　　者：何登发[1] 邹松 于波[2] 包洪平[2] 毛丹凤 魏柳彬 井向辉[2] 石婧 He Dengfa;Zou Song;Yu Bo;Bao Hongping;Mao Danfeng;Wei Liubin;Jing Xianghui;Shi Jing(China University of Geosciences(Beijing),Beijing 100083;PetroChina Changqing Oilfield Company,Xi'an 710018)

机构地区：[1]中国地质大学(北京),北京100083 [2]中国石油长庆油田分公司,西安710018

出　　处：《地质科学》2024年第3期612-624,共13页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：中国石油长庆油田公司科技攻关项目“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”(编号:ZDZX2021-01);国家自然科学基金企业创新发展联合基金项目“海相深层油气富集机理与关键工程技术基础研究”(编号:U19B6003)资助

摘　　要：研究克拉通内构造变形对于揭示克拉通的构造属性具有重要意义,对于油气勘探也具有重要的参考价值。本文应用钻井与高精度反射地震资料,剖析了鄂尔多斯盆地东南部黄龙背斜的构造几何学与运动学特征。研究表明,黄龙背斜发育在渭北隆起东端,是一长18 km、宽15 km的短轴状背斜,地层起伏幅度达200 ms;黄龙背斜自长城系往上至三叠系均具有相似的背斜形态;它是在燕山期基底断层复活而形成的断层传播褶皱背斜;黄龙背斜区内东西向与南北向剖面控制的缩短分别为70 m和90 m,缩短量较小,指示该部位处于燕山期冲断变形的前锋部位,变形即将终止。黄龙背斜响应于周缘构造边界挤压作用,是克拉通内部的基底正断层反转而在沉积盖层形成的褶皱背斜,因地层能干性差异发生了分层剪切。黄龙背斜是一个有利的天然气勘探目标。Studying on the structural deformation in the cratonic interior is a key to disclose its tectonic attributes,and an important reference to its oil and gas exploration.The paper utilizes the borehole data and the high-resolution reflection seismic profiles to discuss the structural geometry and kinematics of the Huanglong anticline in the southeastern Ordos Basin.It shows the Huanglong anticline is located at the eastern end of the Weibei uplift,has a length of 18 km,a width of 15 km,and a structural relief of 200 ms in two-way travel time,giving a type of short-axis anticline.It exhibits the similar anticlinal forms from the Changcheng series upwardly to the Triassic Series.Due to the reactivation of the basement normal fault in the Yanshanian tectonic movement period,it is a fault propagation fold,and has a shortening of 70 m and 90 m in its area along the east-westward and the south-northward profiles,respectively.This kind of small shortening indicates the Huanglong anticline is situated at the leading edge of the fold-and-thrust belt of the Yanshanian tectonic movement period,and tends to be dying of the structural deformation.Responding to the tectonic compression from the peripheral tectonic boundaries,the basement normal fault in the cratonic interior inverted and formed an anticline in the sedimentary cover.Owing to the mechanical stratigraphy of the Huanglong anticline,it has a differential shearing in the strata.The Huanglong anticline is a favorable prospect for natural gas exploration.

关 键 词：黄龙背斜 构造几何学 构造运动学 克拉通盆地 鄂尔多斯盆地东南 

分 类 号：P542[天文地球—构造地质学]