琼东南盆地水合物富集区储层特征及勘探启示
樊奇 , 朱振宇 , 庞维新 , 李清平 , 周松望 , 李元平
地球科学 ›› 2024, Vol. 49 ›› Issue (04) : 1421 -1430.
琼东南盆地水合物富集区储层特征及勘探启示
Reservoir Characteristics and Exploration Implications of Gas Hydrate Enrichment Area, Qiongdongnan Basin
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天然气水合物是海洋新能源的重要开拓领域,南海琼东南盆地是水合物富集区和热点研究区.为进一步摸清琼东南水合物富集区储层特征,选取国产自主技术装备收获的水合物岩心开展分析并获得第一手资料.通过粒度、岩矿分析(含扫描电镜)、随钻测井、红外热成像、氯离子饱和度法等综合分析,测得储层主要是由石英(含量23%)、斜绿泥石(含量17%)、绢云母(含量15%)、钠长石(含量14%)等组成的硅铝质粘土沉积,储层粒度中值15.1~34.1 μm,饱和度分布3%~54%,揭示了水合物储层“细粒性、未成岩、易溃散、高电阻、高声速、强非均质性”等六大特征;结合气源、储层分析和勘探认识,建立了“异地热成因气充注、本地微生物成因气补充、气烟囱顶部运移聚集、海底扇内横向成藏”的成藏模式,重点对123 mbsf和153 mbsf(mbsf全称为meter below seafloor,表示海底以下深度,以“m”为单位)两件原位保压岩心进行X射线和CT扫描,识别出泥质粉砂孔隙型储层(海底扇横向为主)和南海新发现的水合物储层类型泥质粉砂微裂缝型储层(气烟囱垂向为主)两类主要储层;提出了“以古气候-地质事件为节点关注珠江口-琼东南第四系大型砂体的赋存条件和资源潜力、加强传热传质在水合物成藏机理和资源评价中的研究”勘探启示.研究可为中国南海天然气水合物勘查和试采提供重要科学参考.
储层特征 / 细粒 / 未成岩 / 勘探启示 / 天然气水合物 / 琼东南盆地 / 海洋地质学
reservoir characteristics / fine-grained / unconsolidated / exploration inspirations / gas hydrate / Qiongdongnan basin / marine geology
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国家自然科学基金企业联合基金(U19B2005;U20B6005)
中国海油重点实验室主任基金(2024—2025)
国家重点研发计划(2021YFC2800900)
中国工程科技发展战略课题(21-HN-ZD024)
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