摘要
三门峡盆地位于汾渭地堑系东南端,秦岭纬向构造带和新华夏构造的交汇部位。研究其构造格局对盆地油气勘探具有重要意义。综合利用布格重力资料和野外观测资料,刻画盆地断裂特征并划分了构造单元。结果表明:三门峡盆地主要发育近EW向、NE向和NW向三组断裂系,包括4条边界断裂和13条盆地内次级断裂,且边界断裂多以断裂带形式呈现。盆地断裂多形成于前新生代,至第四纪趋于稳定,具有延伸长、切割深的特点。盆地西部布格重力异常值相对较高,剩余重力场盆内自北向南呈近EW向低-高-低的条带分布,且存在多个异常值不同的区域,表明新生代沉积地层较厚,并受断裂控制出现了沉降差异。受中条山南断裂、文底-宫前断裂、灵宝-三门峡断裂和三门峡-硖石断裂等断裂控制,三门峡盆地可划分为3个二级构造单元和9个三级构造单元,盆地自北向南依次为北部坳陷带、中部低隆起和南部坳陷带。整体表现为南北分带、凹隆相间的构造格局。
Sanmenxia Basin is located at the southeast of Fen-Wei Graben, between the Qinling tectonic belt and the intersection of the Neo-Cathaysian structural system. It is of great significance to investigate its tectonic framework for the oil and gas exploration in the basin. Based on the Bouguer gravity data and field observation data, the fault characteristics of the basin were described and the structural units were divided. The results demonstrate that there are mainly three groups of faults in Sanmenxia Basin(near EW-trending, NE-trending and NW-trending), including 4 boundary faults, mainly in the form of fault belts, and 13 sub-basin faults and boundary faults. Most of these basin faults were formed in Pre-Cenozoic, and tended to be stable in Quaternary, with the characteristics of long extension and deep cutting. The Bouguer gravity anomaly in the western part of the basin is relatively high, the residual gravity field in the basin is distributed in a near-EW low-high-low strip trend from north to south, and there are multiple areas with different outliers. This phenomenon indicates that the Cenozoic sedimentary stratum is thick and there is a subsidence difference caused by the faults. According to the influences of the basement faults such as Zhongtiao shan south fault, Wendi-Gongqian fault, Lingbao-Sanmenxia fault and Sanmenxia-Kishi fault, Sanmenxia Basin can be divided into 3 secondary tectonic units and 9 tertiary tectonic units. From north to south, there lies the northern depression belt, the central low-uplift and the southern depression belt, showing an overall tectonic framework: belts in the north and south, and depressions alternating with uplifts.
作者
曲志成
贾会冲
田刚
马超
陈杰
尚亚乐
张云翠
杨明慧
QU Zhi-cheng;JIA Hui-chong;TIAN Gang;MA Chao;CHEN Jie;SHANG Ya-le;ZHANG Yun-cui;YANG Ming-hui(College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;Exploration and Development Research Institute of Sinopec North China Oil&Gas Company,Zhengzhou 450006,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China)
出处
《科学技术与工程》
北大核心
2022年第24期10425-10433,共9页
Science Technology and Engineering
基金
中国石化科技部项目(P20062-4)
华北油气分公司科技研项目(34550008-20-ZC0609-0019)。
关键词
三门峡盆地
断裂系统
构造格局
重力异常
Sanmenxia Basin
fault system
tectonic framework
gravity anomaly
