世界核地质科学2025，Vol.42Issue(5)：988-1002,15.DOI:10.3969/j.issn.1672-0636.2025.05.007
银额盆地迈马凹陷下白垩统巴音戈壁组上段沉积充填及演化特征
Sedimentary filling and evolutionany characteristics of the upper member of Lower Cretaceous Bayingebi formation in Maima sag,Yingen-Ejin basin
摘要
Abstract
The Yingen-Ejin basin is an important Paleozoic-Mesozoic-Cenozoic composite basin in northern China and a key area for oil shale,oil and gas,and uranium resources.The Lower Cretaceous Bayingebi formation serves as a significant uranium-bearing horizon.However,research on the sequence stratigraphy of the target Maima sag in the northeastern Suhongtu depression remains limited,restricting further understanding of sandstone-type uranium mineralization in this region.Based on drilling cores,well-logging data,and previous research results,this study systematically investigated the sedimentary filling characteristics and sequence stratigraphic framework of the Lower Cretaceous Bayingebi formation in the Maima sag by integrating sedimentology and sequence stratigraphy.Four sedimentary facies—alluvial fan,fan delta,meandering river,and lacustrine—along with their subfacies and microfacies,were identified in the study area,reflecting a complete transgressive-regressive sedimentary process in the Maima sag.During the early stage,gravity-flow-dominated alluvial fans and fan-delta plains developed.In the middle stage,lacustrine basin expansion led to the development of fan-delta front deposits.In the late stage,under the influence of regional tectonic uplift,the sedimentary environment transited to semi-deep to deep lacustrine settings.The research show that the upper member of the Bayingebi formation is dominated by fan-delta and lacustrine depositional systems,with the fan-delta system consisting of plain and front subfacies controlling the spatiotemporal configuration of high-quality sand bodies and mudstones in the area.关键词
迈马凹陷/巴音戈壁组/沉积充填Key words
Maima sag/Bayingebi formation/sedimentary filling分类
天文与地球科学引用本文复制引用
叶茂,李鹏,秦彦伟,李天瑜,门宏,刘政国..银额盆地迈马凹陷下白垩统巴音戈壁组上段沉积充填及演化特征[J].世界核地质科学,2025,42(5):988-1002,15.基金项目
核技术研发项目(编号:地H2401)资助 Supported by Nuclear Technology R&D Program(No.地2401) （编号:地H2401）
