海洋地质前沿2025，Vol.41Issue(12)：68-79,12.DOI:10.16028/j.1009-2722.2024.253
高分辨率成像测井技术在深水超浅层天然气储层地质评价中的应用
Application of high-resolution imaging logging technology in geological evaluation of ultra-shallow gas reservoirs in deep-water areas
摘要
Abstract
To finely characterize the lithological and lithofacies features,sedimentary environment characteristics,and evaluate the seal capacity of shallow gas reservoirs in the ultra-shallow layers of the Quaternary Ledong Formation in the Lingnan Low Uplift area of the Qiongdongnan Basin,South China Sea,high-resolution resistiv-ity imaging logging technology was introduced for the comprehensive geological evaluation studies of ultra-shal-low reservoirs for the first time.Results indicate that the lithology of the ultra-shallow reservoirs in the Ledong Formation consists of mainly fine sandstone,siltstone,and muddy siltstone,having four types of sandstone litho-facies,two types of mudstone lithofacies,and mixed accumulation lithofacies developed.Based on the compre-hensive lithofacies and regional geological background,the ultra-shallow reservoirs in the study area are charac-terized by depositional microfacies including mid-fan distributary channels and sheet sands within submarine fans and overlain by thick deposits of deep-sea mudstone,indicating a favorable reservoir-caprock configuration.The degree of natural fracture development in the study area is relatively weak,and horizontal bedding was observed in the mudstone,suggesting a stable post-depositional tectonic environment conducive to the preservation of ultra-shallow gas reservoirs.Additionally,the ultra-shallow reservoirs have undergone significant deformation due to massive deposition transport(MDT)modification,resulting in poorer reservoir properties and the formation of local caprocks for the ultra-shallow gas reservoirs.The application of high-resolution resistivity imaging logging technology in the evaluation of the geological characteristics and seal capacity of ultra-shallow reservoirs com-pensates for the lack of core data due to the shallow burial and loose structure of the reservoirs and provides strong geological support to the subsequent well deployment.关键词
电成像测井/岩性岩相/物源分析/盖层封闭性/超浅层天然气/琼东南盆地Key words
electrical imaging logging/lithology and lithofacies/provenance analysis/cap rock sealing capabil-ity/ultra-shallow reservoirs/Qiongdongnan Basin分类
海洋科学引用本文复制引用
郭书生,王世越,曲长伟,李伸专,吴金龙,罗小莉..高分辨率成像测井技术在深水超浅层天然气储层地质评价中的应用[J].海洋地质前沿,2025,41(12):68-79,12.基金项目
国家自然科学基金(42574180) （42574180）
