地质科技通报2025，Vol.44Issue(4)：273-287,15.DOI:10.19509/j.cnki.dzkq.tb20250087
陆相断陷湖盆源-汇体系重构与控砂机制研究:以珠江口盆地文昌凹陷文一段为例
Reconstruction of source-sink system and sand control mechanisms in continental faulted lake basins:A case study of the First Member of the Wenchang Formation in the Wenchang Sag of the Pearl River Mouth Basin
摘要
Abstract
[Objective]Controlled by complex factors such as basin structure,climate,and water depth,the quantitative reconstruction of source-sink systems,sand transport pathways,and sedimentation processes in rifting lacustrine basins remains a persistent challenge.This study addresses this knowledge gap by investigating the First Member of the Wenchang Formation in the Wenchang Sag of the western Pearl River Mouth Basin.[Methods]Key elements of the source-sink system are quantitatively analyzed through methods including the restoration of lithology and geomorphology in the provenance area,characterization of paleo-valleys,recognition of fault boundary patterns,and determination of sedimentary body types and scales.The coupling relationships between these elements are then discussed.[Results]The results show that the deposition of the First Member of the Wenchang Formation was dominated by fan delta,braided river delta,and shore-shallow lacustrine deposits.The bedrock types of the provenance area are primarily magmatic and sedimentary rocks,with seven provenance systems identified.Four sand control mechanisms within the source-sink system are recognized,and a total of 37 paleo-valleys are identified.In the steep slope zone,sedimentary sand bodies show the closest correlation with elevation difference,watershed area,and cross-sectional area of the valley.In contrast,the ramp zone exhibits the strongest correlation with watershed area,valley length,and cross-sectional area of the valley.[Conclusion]These findings provide a basis for describing sedimentary systems in continental rifting lacustrine basins.关键词
断陷湖盆/源-汇体系/定量化分析/控砂机制/文昌凹陷/珠江口盆地Key words
rifting lacustrine basin/source-sink system/quantitative analysis/sand control mechanism/Wenchang Sag/Pearl River Mouth Basin分类
天文与地球科学引用本文复制引用
陈岳,张建新,王力,徐守立,朱沛苑,张道军..陆相断陷湖盆源-汇体系重构与控砂机制研究:以珠江口盆地文昌凹陷文一段为例[J].地质科技通报,2025,44(4):273-287,15.基金项目
中国海洋石油有限公司科研项目(KJZH-2024-2106) （KJZH-2024-2106）
