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南海北部陆坡神狐海域天然气水合物成藏的流体运移体系
引用本文:吴能友,杨胜雄,王宏斌,梁金强,龚跃华,卢振权,邬黛黛,管红香.南海北部陆坡神狐海域天然气水合物成藏的流体运移体系[J].地球物理学报,2009,52(6):1641-1650.
作者姓名:吴能友  杨胜雄  王宏斌  梁金强  龚跃华  卢振权  邬黛黛  管红香
作者单位:1.中国科学院广州能源研究所,中国科学院可再生能源与天然气水合物重点实验室,广州 510640;2.中国科学院广州天然气水合物研究中心,广州 510640;3.广州海洋地质调查局,广州 510075;4.中国地质科学院矿产资源研究所,北京 100037
基金项目:中国科学院知识创新工程重要方向项目,国家重点基础研究计划973,中国地质调查局专项配套项目 
摘    要:通过新近纪断裂体系和底辟构造特征综合分析认为,底辟构造、高角度的断裂和垂向裂隙系统构成了南海北部神狐海域天然气水合物成藏的主要流体运移体系.神狐海域断层发育,可分为晚中新世活动的NW(NNW)向断层和上新世以来活动的NE(NNE)断层两组.NE向断层活动强度小,规模大,从下至上切穿上新世以来沉积层,组成高角度断裂和垂向裂隙系统.底辟构造在地震剖面上呈直立的、上小下大的烟囱状通道,局部横向扩张呈囊状、花状,形成大型的反射模糊带.底辟构造的发育在上覆沉积层产生了树枝状、似花状组合形态的高角度断裂和垂向裂隙系统,构成了良好的流体运移通道和疏导体系.当富含甲烷气体的流体通过底辟构造、断裂及裂隙系统垂向或侧向运移时,在合适的温压条件下形成天然气水合物.

关 键 词:  face=Verdana>天然气水合物  流体运移体系  断裂  底辟构造  神狐海域  南海  
收稿时间:2008-6-30
修稿时间:2008-9-22

Gas-bearing fluid influx sub-system for gas hydrate geological system in Shenhu Area, Northern South China Sea
WU Neng-You,YANG Sheng-Xiong,WANG Hong-Bin,LIANG Jin-Qiang,GONG Yue-Hua,LU Zhen-Quan,WU Dai-Dai,GUAN Hong-Xiang.Gas-bearing fluid influx sub-system for gas hydrate geological system in Shenhu Area, Northern South China Sea[J].Chinese Journal of Geophysics,2009,52(6):1641-1650.
Authors:WU Neng-You  YANG Sheng-Xiong  WANG Hong-Bin  LIANG Jin-Qiang  GONG Yue-Hua  LU Zhen-Quan  WU Dai-Dai  GUAN Hong-Xiang
Affiliation:1.Guangzhou Institute of Energy Conversion, Key Lab of Renewable Energy and Gas Hydrate, CAS, Guangzhou 510640, China;2.Guangzhou Center for Gas Hydrate Research, CAS, Guangzhou 510640, China;3.Guangzhou Marine Geological Survey,Guangzhou 510075, China;4.Institute of Mineral Resources, CAGS, Beijing 100037, China
Abstract:Based on the comprehensive interpretation and study of the Neogene fracture system and diapiric structure, it can be concluded that the diapiric structures, high-angle fractures and vertical fissure system are the main gas-bearing fluid influx sub-system for gas hydrate geological system in Shenhu Area, northern South China Sea. The Neogene fractures widely developed in the study area may be classed into two groups: NW (NNW)-trending and NE (NNE)-trending. The first group was active in the Late Miocene, while the second one was active since the Pliocene. The NE (NNE)-trending fractures were characterized by lower activity strength and larger scale, and cut through the sediment layers deposited since the Pliocene. Within the top sediment layers, the high-angle fracture and vertical fissure system was developed. The diapiric structures display various types such as a turtle-back-like arch, weak piercing, gas chimney, and fracture (or crack, fissure). On the seismic profile, some diapiric structures show the vertical chimney pathway whose top is narrow and the bottom is wide, where some ones extend horizontally into pocket or flower-shaped structures and formed the seismic reflection chaotic zones. Within the overlying sediment layers of the diapiric structure, the tree branch, flower-shaped high-angle fractures and vertical fissures were developed and became the pathway and migration system of the gas-bearing fluid influx. In the study area, the diapiric structures indicate a high temperature/over pressure system ever developed. Closely associated and abundant bright-spots show the methane-bearing fluid influx migrated vertically or horizontally through the diapiric structures, high-angle fractures and vertical fissures. In the place where the temperature and pressure conditions were favor for the formation of gas hydrate, the hydrate reservoir deposition sub-system was developed.
Keywords:Gas hydrate  Gas-bearing fluid influx system  Fracture  Diapiric structure  Shenhu Area  South China Sea
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