沉积学报2024，Vol.42Issue(4)：1229-1238,10.DOI:10.14027/j.issn.1000-0550.2022.108
海洋天然气水合物发育顶界模拟
Modeling of Sedimentary Pore Capillary Effect on the Top Occurrence of Marine Gas Hydrates
摘要
Abstract
[Objective]Capillary effects increase the solubility of methane in fluids in equilibrium with hydrate,which affects the gas-hydrate distribution.Revealing the influence of capillary effects on the distribution of hydrates can provide theoretical support for the study of hydrate accumulation and hydrate exploration.[Methods]A numeri-cal model was developed to investigate and predict the influence of capillary effects on the top occurrence of gas hydrate,and applied at site ODP994.[Results and Conclusions]The predicted top occurrence was calculated to be about 194 m,consistent with the depth determined from chloride anomalies.The top occurrence of gas hydrate tends to be located at depths where the pore radius is locally larger compared to adjacent layers.The methane concentration in hydrate zone could be increased by capillary effects by increasing solubility of methane in fluids in equilibrium with hydrate.And dissolved methane would be more readily transported upward from hydrate zone,resulting in a shallower top hydrate occurrence.Therefore,capillary effects in gas hydrate stability zones plays a important role in determining the upper boundary of gas hydrates.关键词
毛细管作用/硫酸根甲烷界面/甲烷通量/水合物发育顶界/数值模拟Key words
capillary effect/sulfate-methane interface/methane flux/top occurrence of gas hydrate/numerical simulation分类
天文与地球科学引用本文复制引用
曹运诚,周海玲,郑子涵,陈多福..海洋天然气水合物发育顶界模拟[J].沉积学报,2024,42(4):1229-1238,10.基金项目
国家自然科学基金项目(41730528,41776050) （41730528,41776050）
国家重点研发计划(2018YFC0310001)[National Natural Science Foundation of China,No.41730528,41776050 （2018YFC0310001）
National Key Research and Development Project,No.2018YFC0310001] （）
