摘要
为了探明矿物类型对于天然气水合物成藏的影响,笔者等利用南海北部神狐海域W07站位样品及其水合物饱和度数据,进行XRD全岩和黏土矿物测试分析、比表面积分析以及束缚水能力综合分析。结果表明,海床下110~127 m(即110~127 mbsf,meters below sea floor,海床以下深度)为非水合物储层段,海床下127~156 m为水合物储层段。通过XRD分析可知,高石英及长石含量,低伊蒙混层含量的层段,比表面积与束缚水能力较低,说明其具有相对较好的孔渗条件,为水合物的运移与储集提供了良好的空间条件,因此形成水合物储层段;而在高伊蒙混层的层段中,比表面积较大,束缚水能力较强,其对甲烷气体及流体的吸附和束缚能力较强,对水合物成藏起到潜在的封隔作用,成为非储层段,储层与非储层段纵向叠置序列有利于优质水合物储层的形成。本次研究总结了矿物组分与优质水合物储层之间的关系,并揭示两者存在的潜在成因联系,以期丰富水合物富集成藏的基础理论,对未来南海北部天然气水合物的商业化开发提供支持。
Objectives:As a new type of clean energy to replace conventional fossil energy,natural gas hydrate research has been increasingly emphasized by the academic community.In the past 40 years,western countries have carried out a large number of investigations and studies on natural gas hydrates,and systematic research has been carried out on the mineralization conditions,distribution law,formation mechanism,exploration technology,economic evaluation and environmental effects of natural gas hydrates.In order to investigate the effect of mineral type on gas hydrate formation,the following studies are carried out in this paper.Methods:Whole rock and clay mineral XRD test analysis,specific surface area analysis,and comprehensive analysis of irreducible water capacity were carried out using the samples from site W07 and their hydrate saturation data in Shenhu Sea,northern South China Sea.Results:The results show that 110~127 meters below sea floor is the non-hydrate reservoir section and 127~156 meters below sea floor is the hydrate reservoir section.The XRD analysis shows that the layers with high quantity of quartz and feldspar and low quantity of I/S mixed-layer mineral have lower specific surface area and irreducible water capacity,which indicates that they have relatively good pore permeability conditions,providing good spatial conditions for hydrate transport and storage,and therefore forming hydrate reservoir sections;while in the layers with high quantity of I/S mixed-layer mineral,the specific surface area is larger,the irreducible water capacity is stronger,and its adsorption and irreducible capacity of methane gas and fluid are stronger,and its adsorption and irreducible capacity for hydrate are stronger irreducible capacity,which plays a potential sealing role for hydrate formation and becomes non-reservoir section.Reservoir and non-reservoir section vertical stacking sequence is conducive to the formation of high-quality hydrate reservoirs.Conclusions:The present study summarizes the relationship between mine
作者
徐小蕾
白辰阳
苏丕波
马倩
张宇
梁金强
XU Xiaolei;BAI Chenyang;SU Pibo;MA Qian;ZHANG Yu;LIANG Jinqiang(School of Ocean Sciences,China University of Geosciences,Beijing,100083;Key Laboratory of Marine Mineral Resources and Polar Geology(China University of Geosciences,Beijing),Beijing,100083;Academy of South China Sea Geological Science,China Geological Survey,Sanya,Hainan,572000;Natural Gas Hydrate Engineering Technology Center,China Geological Survey,Beijing,100037;Guangzhou Marine Geological Survey,China Geological Survey,Guangzhou,510075;PetroChina Changqing Oilfield Company,Jingbian,Shaanxi,718500)
出处
《地质论评》
CAS
CSCD
北大核心
2024年第3期1205-1220,共16页
Geological Review
基金
南海重点海域天然气水合物资源勘查项目(编号:DD20230064)
崂山实验室科技创新项目(编号:LSKJ202203501)的成果。
