海洋地质与第四纪地质2024，Vol.44Issue(6)：1-11,11.DOI:10.16562/j.cnki.0256-1492.2024091102
琼东南盆地渗漏型天然气水合物识别与差异成藏特征
Identification and the differential accumulation of leakage-typed gas hydrate in the Qiongdongnan Basin,northern South China Sea
摘要
Abstract
Leakage-typed gas hydrates occurs in the form of block,vein,nodule in the core and are developed widely in tubular leakage passage in the Songnan low uplift in the central depression of the Qiongdongnan Basin in the northern South China Sea.To explore a comprehensive identification method for the leakage-typed gas hydrate and their differences in the accumulation for various ore bodies of leakage-typed gas hydrate.Identification for multiple types of gas hydrate reservoirs and fluid leakage distribution were studied combining seismic,logging well drilling,and borehole data.In the comprehensive identification methods,seismic reflection phase axis pull-up and variance seismic attribute anomalies indicate fluid leakage channels;the separation of lateral and induced resistivity logging curves,the bright and high-angle deformation layers seen in the resistivity image are the logging responses of leaky hydrates.Based on the borehole data and seismic profiles,three gas-hydrate ore bodies related to leakage gas hydrates were identified,and one of them encountered high-saturation diffusion gas hydrates in sandy sediment.The deposition of sand bodies significantly weakened the fluid leakage intensity of the hydrate ore bodies,during which sand sediments served as good reservoirs,and also energy storage with pressure relief.In hydrate ore bodies without developed sand bodies,seepage-type hydrates are significantly developed in seepage channels,while far away from the seepage channels,the hydrate drilling indication is poor.However,in the absence of sand sediment,leakage gas hydrates well developed in the leakage channels,while far away from the channels,the hydrate drilling indication is poor.Therefore,sand bodies and the leakage channels are the main controlling factors for the differential accumulation of leakage-typed gas hydrate in the Qiongdongnan Basin.关键词
渗漏型天然气水合物/综合识别/差异成藏/砂体/渗漏通道/琼东南盆地Key words
leakage-typed gas hydrate/comprehensive identification methods/differential accumulation/sand sediment/leakage channel/Qiongdongnan Basin分类
海洋科学引用本文复制引用
谢莹峰,任金锋,邓炜,陆敬安,匡增桂,康冬菊,曲长伟..琼东南盆地渗漏型天然气水合物识别与差异成藏特征[J].海洋地质与第四纪地质,2024,44(6):1-11,11.基金项目
国家自然科学基金联合基金项目"南海北部高富集天然气水合物储层特征与成藏控制机理研究"(U224420148) （U224420148）
自然资源部中国地质调查局地质调查项目(DD20230063,DD20221700) （DD20230063,DD20221700）
