地质论评2024，Vol.70Issue(3)：1205-1220,16.DOI:10.16509/j.georeview.2023.11.061
南海北部神狐海域细粒储层矿物组分对天然气水合物储集赋存的影响
Influence of mineral fraction of fine-grained reservoir on gas hydrate storage and deposition in the Shenhu area,northern South China Sea
摘要
Abstract
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 hydrate reservoir section and 127～156 meters below sea floor is the non-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 mineral components and high-quality hydrate reservoirs,and reveals the potential genesis links between the two,with a view to enriching the basic theory of hydrate enrichment and reservoir formation,and supporting the future commercial development of natural gas hydrates in the northern part of the South China Sea.关键词
南海北部/神狐海域/GMGS4/天然气水合物/黏土矿物Key words
north South China Sea/Shenhu sea area/GMGS4/gas hydrates/clay minerals引用本文复制引用
徐小蕾,白辰阳,苏丕波,马倩,张宇,梁金强..南海北部神狐海域细粒储层矿物组分对天然气水合物储集赋存的影响[J].地质论评,2024,70(3):1205-1220,16.基金项目
本文为南海重点海域天然气水合物资源勘查项目(编号:DD20230064)和崂山实验室科技创新项目(编号:LSKJ202203501)的成果. （编号:DD20230064）
