西安石油大学学报（自然科学版）2025，Vol.40Issue(5)：13-21,9.DOI:10.3969/j.issn.1673-064X.2025.05.002
玛湖凹陷MZ409井区上三叠统白碱滩组物源体系与沉积充填过程分析
Analysis of Provenance System and Sedimentary Filling Process of Upper Triassic Baijiantan Formation in MZ409 Wellblock of Mahu Sag
摘要
Abstract
The Upper Triassic Baijiantan Formation in Mahu Sag,the Junggar Basin is developed in the stage of relatively quiet intra cratonic depression,and MZ409 well block is developed in the coastal shallow lake-semi deep lake area.The peripheral provenance supply system is unknown and the understanding of sedimentary facies belt is still controversial.The sedimentary sources and filling processes of the Baijiantan Formation in the MZ409 well block of the Mahu Sag are analyzed and discussed by analyzing the ancient landforms,heavy mineral components,rock debris components,grain size characteristics,and clay mineral components of the Baijiantan Formation in the study area,combined with the structural background and parent rock lithology characteristics,and modern sedimentary comparisons.Research results show that in the sedimentation period of the Baijiantan Formation in the study area,the ancient landforms were high in the east and low in the west,with a slope angle of 0°～2°throughout the area.The overall sedimentary environment was shallow lake,and the relatively flat ancient landform pattern was conducive to wave transformation.Three main sediment sources devel-oped around the study area,and the comparison of multiple factors between sediment and surrounding sediment sources shows that the sedimentation of the Baijiantan Formation in the study area is supplied by multiple surrounding sediment sources.The sedimentation of the Baijiantan Formation in the study area was under lake retreat background.As the lake level decreases,the hydrodynamics in the study area increases,the supply of material sources is sufficient,and the sedimentation of beach bar sand bodies gradually increases.The research results can provide direction for the sedimentary facies division of the study area and ideas for the exploration and development of the MZ409 well block.关键词
物源分析/白碱滩组/充填过程/玛湖凹陷Key words
provenance analysis/Baijiantan Formation/filling process/Mahu Sag分类
天文与地球科学引用本文复制引用
祁壮壮,张小栓,胡鑫,高雯璐..玛湖凹陷MZ409井区上三叠统白碱滩组物源体系与沉积充填过程分析[J].西安石油大学学报（自然科学版）,2025,40(5):13-21,9.基金项目
中国石油天然气集团公司重大科技专项"深层砾岩规模成藏主控因素分析与富集高产规律研究"(2023ZZ24-01) （2023ZZ24-01）
