南海北部陆坡聚集流体活动系统及其对天然气水合物成藏的指示意义  

Collective fluid flow system and its implications for gas hydrate accumulation in the north slope of the South China Sea

作　　者：张旭东[1,2,3] 尹成 曾凡详 赵斌 ZHANG Xudong;YIN Cheng;ZENG Fanxiang;ZHAO Bin(Key Laboratory of Marine Mineral Resources,Ministry of Natural Resources/Guangzhou Marine Geological Survey,Guangzhou 510075,Guangdong,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation/Southwest Petroleum University,Chengdu 610500,Sichuan,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,Guangdong,China)

机构地区：[1]自然资源部海底矿产资源重点实验室/广州海洋地质调查局,广东广州510075 [2]油气藏地质及开发工程国家重点实验室/西南石油大学,四川成都610500 [3]南方海洋科学与工程广东省实验室(广州),广东广州511458

出　　处：《地质通报》2021年第2期280-286,共7页Geological Bulletin of China

基　　金：中国地质调查局项目(编号:DD20190222、DD20191007);同济大学海洋地质国家重点实验室开放基金课题(编号:MGK1920、MGK202007);南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(编号:GML2019ZD0208、GML2019ZD0207)。

摘　　要：利用台西南盆地三维高精度地震资料,对南海北部陆坡聚集流体活动系统进行了分析和研究。在研究区识别出了断层、气烟囱、泥火山、泥底辟等聚集流体活动系统。研究区聚集流体活动系统主要特征包括:(1)断层与气烟囱相伴生;(2)气烟囱发育的区域与似海底反射(BSR)分布区域基本吻合,在气烟囱上方可以识别出一定长度的BSR;(3)泥底辟/泥火山导致周围和上覆地层形成了大量小尺度断层和微裂隙,中、深部流体可沿破裂带向上运移至天然气水合物稳定带内形成天然气水合物。因此,研究区聚集流体活动系统为天然气水合物发育成藏提供了流体来源,有利于天然气水合物的聚集,对于揭示天然气水合物的富集规律意义重大,能够为其他区域天然气水合物勘探提供借鉴。Based on 3D high-precision seismic data used to analyze the collective fluid flow systems in the Taixinan Basin,a collective fluid flow system including faults,gas chimneys,mud volcano,and mud diapir was identified in the study area.The main characteristics of the collective fluid flow system in the study are manifested as follows:a,association of faults with gas chimneys;b,consistence of the development area of gas chimneys with the distribution area of Bottom Simulating Reflection(BSR),and a certain length of BSR identified above the gas chimney;c,development of a large number of small scale faults and micro-fissures in the surrounding and overlying strata resulting from mud diapirs/mud volcanoes,and formation of gas hydrate caused by upward migration of the middle and deep fluids along the rupture zone to the stable zone.Therefore,the collective fluid flow system in the study area provides a source of fluid for the development of gas hydrate,which is conducive to the accumulation of gas hydrate.It is of great significance for revealing the enrichment rule of gas hydrate and can provide references for gas hydrate exploration in other regions.

关 键 词：台西南盆地 聚集流体 活动系统 天然气水合物 南海北部陆坡 

分 类 号：P618.13[天文地球—矿床学]