中国地质调查2025，Vol.12Issue(6)：1-10,10.DOI:10.19388/j.zgdzdc.2025.274
中上扬子地区震旦系灯影组沉积特征及其对碳酸盐岩优质储层的影响
Sedimentary characteristics of the Sinian Dengying Formation in the Middle-Upper Yangtze Region and their influence on high-quality carbonate reservoirs
摘要
Abstract
The Sinian Dengying Formation in the Middle-Upper Yangtze Region is a high-quality reservoir for oil and gas exploration.Current targeted exploration remains concentrated in Sichuan Basin,while investigations outside the basin are relatively underexplored.Deyang-Anyue trough and Western Hubei trough within the Mid-dle-Upper Yangtze Region were selected as key areas to further clarify the sedimentary processes and reservoir characteristics of Dengying Formation.The sedimentary evolution and spatial distribution of reservoirs were ana-lyzed by integrating the surface outcrop data with the drilling records.Key findings showed that Dengying Forma-tion could be subdivided into four members in most of the Middle-Upper Yangtze region,specifically designated as Hamajing,Shibantan,Baimatuo,and Tianzhushan Members in Yichang area of the western Hubei Province.Three phases of Tongwan tectonic movement during Dengying deposition period significantly reshaped carbonate reservoirs.Phase Ⅰ occurred at the top of the second member,Phase Ⅱ occurred at the formation's upper bounda-ry,and Phase Ⅲ occurred at the top of Maidiping(Yanjiahe)Formation.Dengying Formation of the Middle-Upper Yangtze was characterized by"three-platform-two-trough"paleogeographic framework.The extension-al settings created graben-horst platform-basin structures,and organic-rich shales deposited in these troughs during the Early Cambrian,providing premium source rocks.Steep slopes formed along both flanks of Western Hubei and Deyang-Anyue troughs,and favorable reservoirs in Dengying Formation developed in the higher parts of the platform,which were platform margins and intra-platform shoals.Sandwich-style hydrocarbon assem-blage formed in high-quality dolomitic reservoirs in Dengying Formation,underlying Doushantuo Formation shales and overlying Qiongzhusi(Shuijingtuo)Formation.The preservation conditions was critical for natural gas accumulation.These results could provide new theoretical foundations and exploratory directions for Dengying For-mation oil and gas exploration.关键词
震旦系/灯影组/沉积特征/储层特征Key words
Sinian System/Dengying Formation/sedimentary characteristics/reservoir characteristics分类
天文与地球科学引用本文复制引用
陈科,王昱荦,卢妍欣,李飞..中上扬子地区震旦系灯影组沉积特征及其对碳酸盐岩优质储层的影响[J].中国地质调查,2025,12(6):1-10,10.基金项目
国家自然科学基金"古特提斯洋俯冲方向和过程对三江造山带构造格架的控制(编号:U2344213)"项目资助. （编号:U2344213）
