海洋地质前沿2025，Vol.41Issue(9)：68-80,13.DOI:10.16028/j.1009-2722.2024.118
琼东南盆地冷泉渗漏区沉积物孔隙发育特征及其主控因素
Development and main controlling factors of sediment pores in the cold seep area of Qiongdongnan Basin
摘要
Abstract
Methane rich cold seeps are direct outcrops of natural gas hydrates at the seabed,and are also import-ant indicators for exploring deepwater oil and gas resources.At present,significant progresses have been made in the investigation of natural gas hydrates in the Qiongdongnan Basin.However,research on the characteristics of sedimentary pore development is still relatively weak.Therefore,in-depth analysis of sedimentary reservoir char-acteristics is of great economic and scientific significance for comprehensive understanding of the accumulation of basin hydrates,and for promoting the exploration and development of hydrate resources in the northern South China Sea.We conducted a detailed study on the mineral composition,reservoir space types,microstructure,and physical properties of seabed sediments and cold seep carbonate samples in the cold seep leakage area of the Qiongdongnan Basin based on scanning electron microscopy,the RoqSCAN testing,micrometer CT scanning imaging,and sediment particle size experimental data.Results show that ① autogenic carbonates,sulfates,and sulfides that are indicative of natural gas hydrates have been detected in the cold spring carbonate rock samples.② The storage space is mainly composed of dissolution pores,followed by fractures.The effective porosity calcu-lated by micron CT scanning imaging ranges from 5.18%to 9.54%,on average of 8.14%,indicating a medium to low porosity reservoir.The pore size is mainly composed of fine and coarse pores.Overall,the surface sediment and cold seep carbonates in the Qiongdongnan Basin have reservoir conditions.③ The contents of carbonate min-erals and mud are important factors affecting the reservoir properties.The higher the content of carbonate miner-als,the lower the mud content,and the better the reservoir properties.Factors that affect the development and evolution of reservoir pore structure include sedimentation and the alteration of diagenesis.The reservoir proper-ties of different types of reservoirs are controlled by their main mineral component types.关键词
沉积物/自生矿物分析/微观结构/冷泉渗漏/琼东南盆地Key words
sediment/authigenic mineral analysis/microstructure/cold seep leakage/Qiongdongnan Basin分类
天文与地球科学引用本文复制引用
汪贵锋,王子雯,黄仕锐,熊鹏飞,崔凯,刘艳锐,秦菡,方小宇..琼东南盆地冷泉渗漏区沉积物孔隙发育特征及其主控因素[J].海洋地质前沿,2025,41(9):68-80,13.基金项目
海南省科技专项"琼东南盆地天然气水合物资源评价与目标优选"(ZDYF2023GXJS008) （ZDYF2023GXJS008）
海南省海洋地质资源与环境重点实验室开放课题"琼海海岸带海域浅地层结构及沉积层序研究"(22-HNHYDZZY-HJKF026) （22-HNHYDZZY-HJKF026）
