摘要
在前人研究中,银额盆地磁性基底埋深与基底性质研究缺乏区域性细节信息,整体勘探程度偏低。本文基于最新的高精度航磁资料,利用剖面切线法对银额盆地前泥盆纪磁性基底埋藏深度进行了计算,划分出5个沉积凹陷中心,其平均深度大于6 km,并呈现出东浅西深的特点。通过选取研究区西部重磁剖面开展联合反演,对深度计算结果进行验证,显示拗陷区磁性基底埋藏深度在3~6 km之间,与切线法计算得出的磁性基底埋深变化趋势、深度范围一致,基底的隆坳格局也进一步控制了上覆沉积盖层的分布范围。通过对比银额盆地与雅布赖盆地磁性基底性质的差异,本文提出,尽管恩格尔乌苏断裂在区域磁场中显示效果不及巴丹吉林断裂明显,但恩格尔乌苏断裂却是塔里木板块与华北板块的拼接缝合线,而巴丹吉林断裂只是切割基底的深大断裂。利用重磁资料计算银额盆地磁性基底埋深并分析深部构造特征,对于区域油气生成、保存具有重要的意义。
In previous studies,study on the depth and properties of magnetic basement in Yin'e Basin lacked regional detailedinformation,and the overall exploration level was relatively low.Based on the latest high-precision aeromagnetic data,the burialdepth of the pre-Devonian magnetic basement in the Yin'e Basin was calculated using the section tangent method.Five sedimentarydepression centers were identified,with an average depth of more than 6 km,exhibiting the characteristics of being shallow in theeast and deep in the west.By conducting joint inversion of gravity-magnetic profiles in the western part of the study area to verify thedepth calculation results,it is shown that the burial depth of the magnetic basement in the depression area ranges from 3 to 6 km.Thisis consistent with the variation trend and depth range of the magnetic basement depth calculated by the tangent method.Additionally,the uplift-depression pattern of the basement further controls the distribution range of the overlying sedimentary cover.By comparingthe differences in magnetic basement properties between the Yin'e Basin and the Yabulai Basin,this study proposes that although theEnger Us fault shows less pronounced effects in the regional magnetic field compared to the Badain Jaran Fault,the Enger Us Fault isactually the suture zone where the Tarim Plate and the North China Plate converge,while the Badain Jaran Fault is merely a deep,major fault cutting through the basement.The calculation of the magnetic basement burial depth and analysis of deep structuralcharacteristics in the Yin'e Basin using gravity and magnetic data are of great significance for the generation and preservation ofregional oil and gas resources.
作者
胡悦
周道卿
曹宝宝
胡夏炜
魏岩岩
丁燕云
肖梦楚
赵睿
郑宇舟
HU Yue;ZHOU Daoqing;CAO Baobao;HU Xiawei;WEI Yanyan;DING Yanyun;XIAO Mengchu;ZHAO Rui;ZHENG Yuzhou(China Aero Geophysical Survey&Remote Sensing Center for Nature Resources,Beijing 100083,China)
出处
《沉积与特提斯地质》
北大核心
2025年第4期846-855,共10页
Sedimentary Geology and Tethyan Geology
基金
中国地质调查局“重点地区航空地球物理调查”(DD20230012)。
关键词
地球物理学
基底特征
航磁异常
断裂构造
银额盆地
geophysics
basement characteristics
aeromagnetic anomaly
fault structure
Yin'e Basin
