海洋地质与第四纪地质2023，Vol.43Issue(6)：112-121,10.DOI:10.16562/j.cnki.0256-1492.2022091402
杭州湾沉积物中甲烷的垂向分布及控制因素
Vertical distribution and controlling factors of methane in sediments of Hangzhou Bay
摘要
Abstract
A large amount of methane is trapped in the sediments of estuarine delta.As a factor of greenhouse gas and a marine geological hazard,the occurrence features of methane in marine sediments can provide theoretical support for shallow gas prevention measures and eco-environmental effects.Based on the test results and geochemical parameters of cores YS3,YS4,YS6,and YS7 in Hangzhou Bay,the methane vertical distribution and the controlling factors were studied.We found one layer of methane gas in 1.5～22.5 mbsf in YS3 and 8～42 mbsf in YS6,and two layers of methane gas in 5～11 mbsf in YS4 and 23～47 mbsf in YS7.Methane in each core was buried in silt and clay-dominated sedimentary layers;the highest contents of CH4 in the YS3,YS4,YS6,and YS7 cores were 5.66 mM,1.73 mM,1.96 mM,and 2.12 mM,respectively,and generated through CO2/H2 reduction pathway.The diffusion migration and anaerobic oxidation of methane reached a dynamic equilibrium in the in-situ marine sediment layer.Sediment porosity,clay content,and organic carbon content were important influencing factors on the contents,distribution layers,buried depth,and thickness of methane in the Hangzhou Bay marine sediments.关键词
甲烷/垂向分布/沉积物/杭州湾Key words
methane/vertical distribution/sediments/Hangzhou Bay分类
海洋科学引用本文复制引用
李凤,段晓勇,贺行良,张媛媛,印萍,谢永清,杨磊,董超..杭州湾沉积物中甲烷的垂向分布及控制因素[J].海洋地质与第四纪地质,2023,43(6):112-121,10.基金项目
中国地质调查局项目(DD20160145,DD20190263,DD20221775) （DD20160145,DD20190263,DD20221775）
浙江省基础性公益性战略性地质工作项目专项资金(GZH201200506,[省资]2017006,[省资]2020007) （GZH201200506,[省资]2017006,[省资]2020007）
国家自然科学基金"舟山近海浅层气形成的关键控制因素和机理"(42176091) （42176091）
亚洲合作专项"长江三角洲与红河三角洲海洋地质环境与地质灾害对比研究" （）
