神狐海域气烟囱发育特征及其对天然气水合物分布的影响

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中文摘要：天然气水合物不仅是未来潜在的清洁能源,同时对全球气候变化也有着显著影响,已受到世界各国的广泛关注.神狐海域作为天然气水合物研究热点区域,至今已涌现大量成果,但有关气体运移通道对天然气水合物分布的研究还较为薄弱.为了进一步揭示该区天然气水合物成藏机理,本文综合运用高精度三维地震资料、测井资料以及气体地球化学数据,精细刻画了气烟囱的地震反射特征、发源层位及发育时间,分析了典型钻井天然气水合物赋存特征,阐明了气烟囱发育对水合物分布的影响.气烟囱从底到顶呈现出复杂多样的特征,包括底部杂乱反射带、体部振幅空白带以及顶部强振幅反射带.根据其根部延伸层位,气烟囱主要发源于古近系,部分发源于新近系,并且绝大多数气烟囱顶部终止于第四系.结合测井数据,可发现气烟囱的发育对天然气水合物的分布具有明显的控制作用.天然气水合物赋存在发源于古近系文昌组—恩平组并终止于第四系的气烟囱发育区域.结合天然气水合物气体地球化学数据,证实了研究区热成因气对天然气水合物成藏的贡献,表明了断层和气烟囱在垂向气体运移输导体系中的重要性,并在此基础上建立了天然气水合物成藏模式,为早日实现天然气水合物的商业化开采提供了坚实的地质基础.

外文标题：Gas chimneys in the Shenhu area and their influences on the distribution of gas hydrates

外文摘要：Gas hydrates represent a promising clean energy source and hold significant implications for global climate change,garnering considerable international attention.Shenhu area,a prominent gas hydrate research hotspot,has yielded a wealth of findings to date.However,a comprehensive under standing of gas migration pathways and their impacts on gas hydrate distribution in this region remains incomplete.To elucidate the mechanisms governing gas hydrate accumulation in the Shenhu area,this study integrates high-resolution 3D seismic data,well logging data,and hydrate gas geochemical data.This multi-faceted approach allows for fine-scale characterization of gas chimneys,analysis of gas hydrate occurrence characteristics in representative drilling wells,and clarification of the influences of gas chimneys on gas hydrate distribution.Gas chimneys exhibit distinct vertical zonation,characterized by a chaotic reflection zone at the bottom,an acoustic blanking zone in the middle,and a high-amplitude reflection zone at the top.Analysis reveals that most gas chimneys originate in the Paleogene,with some originating in the Neogene and the vast majority terminating in the Quaternary.Integration of well logging data reveals that gas chimney development has a significant control on gas hydrate distribution.Gas hydrates are mostly found in areas where gas chimneys originate from the Paleogene Wenchang-Enping formations and terminate in the Quaternary.Geochemical analysis of hydrate gas confirms the contribution of thermogenic gas to gas hydrate accumulation in the study area,highlighting the importance of faults and gas chimneys as conduits in the vertical gas migration pathway system.Based on these findings,a model for gas hydrate accumulation in the Shenhu area is proposed.This model provides a solid geological foundation for informing the future commercial exploitation of gas hydrates in this region.

外文关键词：

gas hydratesgas chimneythermogenic gasgas migrationaccumulation modelShenhu area

作者：

程聪、姜涛、匡增桂、任金锋、陈子归

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作者单位：

中国地质大学广州南沙地大滨海研究院,广东广州,511462

中国地质大学海洋地质资源湖北省重点实验室,湖北武汉,430074

天然气水合物勘查开发国家工程研究中心,中国地质调查局广州海洋地质调查局,广东广州,511458

关键词：

天然气水合物气烟囱热成因气气体运移成藏模式神狐海域

基金：

广东省基础与应用基础研究基金国家自然科学基金项目国家自然科学基金项目中国海洋石油有限公司综合科研科技课题中国地质调查局二级项目广东省基础与应用基础研究重大项目

项目编号：

2023A15151104054197607342276073KJZH-2023-2102DD202300642020B0301030003

出版年：

2024

DOI：

10.19762/j.cnki.dizhixuebao.2024425

地质学报

中国地质学会

地质学报

CSTPCD北大核心

影响因子：2.17

ISSN：0001-5717

年,卷(期)：2024.98(9)

被引量1
参考文献量19