| 泥底辟输导流体机制及其与天然气水合物成藏的关系 |
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| 引用本文： | 刘杰,孙美静,杨睿,苏明,严恒.泥底辟输导流体机制及其与天然气水合物成藏的关系[J].现代地质,2016,30(6):1399-1407. |
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| 作者姓名： | 刘杰 孙美静 杨睿 苏明 严恒 |
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| 作者单位： | 1 中国科学院 可再生能源重点实验室，广东 广州510640；
2中国科学天然气水合物重点实验室，中国科学院广州能源研究所，广东 广州510640；
3广州海洋地质调查局，广东 广州510760；4中海石油有限公司湛江分公司，广东 湛江524057 |
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| 基金项目： | 中国科学院可再生能源重点实验室基金项目(y507j61001)；中国地质大学构造与油气资源教育部重点实验室开放基金(TPR-2014-14)；中国石油-中国科学院科技合作项目(2015A-4813)。 |
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| 摘 要： | 摘要：详细阐述不同成因的泥底辟流体输导模式，探讨了泥底辟输导体系的演化与天然气水合物成藏之间的关系，并分析神狐海域泥底辟输导体系对天然气水合物成藏的影响。底辟核外部伴生断裂、底辟核内部流体压裂裂缝和边缘裂缝带均可作为输导流体的通道。根据运移通道和动力等差异性，提出泥底辟输导流体的2种端元模式：超压-流体压裂输导型和边缘构造裂缝输导型。在此基础上，讨论了泥底辟(泥火山)的不同演化阶段对水合物的形成、富集和分解的影响。早期阶段，泥底辟形成的运移通道可能未延伸到水合物稳定带，导致气源供给不够充分；中期阶段，水合物成藏条件匹配良好，利于天然气水合物生成；晚期阶段，泥火山喷发引起水合物稳定带的热异常，可能导致水合物分解，直至泥火山活动平静期，水合物再次成藏。神狐海域内泥底辟分为花冠状和穹顶状两类，花冠状泥底辟以超压-流体压裂输导型为主；穹顶状泥底辟以底辟边缘裂缝输导型为主。泥底辟输导体系的差异性可能是神狐海域天然气水合物非均质分布的影响因素之一。
关键词：泥底辟；输导体系；天然气水合物；成藏机制；神狐海域
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| 关 键 词： | 泥底辟 输导体系 天然气水合物 成藏机制 神狐海域 |
Diapir Conduit Fluid Mechanism and Its Relationship with Gas Hydrate Accumulations |
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| LIU Jie,SUN Meijing,YANG Rui,SU Ming,YAN Heng.Diapir Conduit Fluid Mechanism and Its Relationship with Gas Hydrate Accumulations[J].Geoscience——Journal of Graduate School,China University of Geosciences,2016,30(6):1399-1407. |
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| Authors: | LIU Jie SUN Meijing YANG Rui SU Ming YAN Heng |
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| Institution: | 1Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou, Guangdong510640, China; 2 Key Laboratory
of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, Guangdong510640, China;
3 Key laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou Marine Geological Survey, Guangzhou,
Guangdong510750, China; 4 Zhanjiang Division of CNOOC Ltd, Zhanjiang, Guangdong524057,China |
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| Abstract: | Abstract:This paper describes fluid migration patterns about mud diapir with different origins, then discusses the relationship between natural gas hydrate accumulation and the evolution of mud diapir migration system, and analyzes the effect of mud diapir migration system on gas hydrate accumulation in Shenhu area.The fluid migration systems for diapir consist of external associated fault and fracture, the internal overpressured fluid fracture and structural fracture in the margin of diapir. Depending on migration conduit and migration dynamics, two kinds of fluid migration patterns have been proposed: overpressure conducting fracturing fluid migration type and marginal fracture migration type. In addition, the mud diapir (mud volcano) has different effects on formation and stability of the hydrate in the different evolution stages. The migration channel may not extend to the hydrate stability zone in the early stages of mud diapiric formation, which results in insufficient supply of CH4. It is conducive to the formation of natural gas hydrates in the middle stage, because of good matching in hydrate metallogenic conditions; the abnormal heat in the hydrate stability zone, caused by high temperature gas bearing fluid from mud volcano eruption, may lead to the decomposition of hydrates in the late stage. Until the quiet period of mud volcano activity, hydrates can be reserved again. According to morphological characteristics of diapirs in Shenhu Area, mud diapirs could be classified into two types: corolliform and dome form diapirs. The fluid migration pattern of corolliform diapirs belongs to overpressure conducting fracturing fluid migration type; the fluid migration pattern of dome form diapirs belongs to marginal fracture migration type. Different diapiric migration patterns may be one of main factors of non homogeneous distribution of gas hydrate in Shenhu area. |
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| Keywords: | mud diapir fluid migration system gas hydrate reservoir mechanism Shenhu area |
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