南海北部陆坡天然气水合物区海水甲烷浓度分布特征及其影响因素探讨

发布时间：2018-03-19 22:37

本文选题：海水甲烷浓度　切入点：分布特征　出处：《地学前缘》2017年04期 　论文类型：期刊论文

【摘要】：2011—2015年对东沙和神狐水合物钻探区进行了连续5年7个航次的海上调查工作,获取了大量研究区海水水文、水化学及溶解甲烷含量数据,为天然气水合物勘查与试采环境评价提供了良好的基础数据及采前环境基线。调查期间,研究区海水甲烷浓度范围为0~31.4nmol·L~(-1),平均浓度为6.7nmol·L~(-1),高于全球平均海水甲烷浓度,表明南海海水甲烷浓度本底值高于全球平均水平;研究区海水溶解甲烷浓度及其分布特征不受区域海水水文特征、海水化学特征及季节等因素影响,且表层海水-大气甲烷交换并非单一的汇或者源的关系,而是根据时间的不同,海水-大气甲烷交换存在汇源转换;综合调查结果表明,研究区甲烷渗漏对海水、大气甲烷含量没有明显影响,且水合物钻探对区域环境没有明显的影响。
[Abstract]:From 2011 to 2015, 7 sea surveys were carried out on Dongsha and Shenhu hydrate drilling areas for 5 consecutive years. A large number of hydrological, hydrochemical and dissolved methane content data were obtained in the study area. During the investigation period, the concentration range of sea water methane in the study area is 0 ~ 31.4 nmol 路L ~ (-1) N ~ (-1), the average concentration is 6.7 nmol 路L ~ (-1) ~ (-1), which is higher than the global average concentration of sea water methane. The results show that the background value of sea water methane concentration in the South China Sea is higher than that of the global average, and the concentration and distribution of dissolved methane in seawater in the study area are not affected by the hydrological characteristics, sea water chemistry characteristics and seasons in the study area. Moreover, the surface seawater to atmosphere methane exchange is not a single sink or source relationship, but according to the time difference, the sea water atmosphere methane exchange exists the sink source conversion, the comprehensive investigation result shows that the methane leakage in the study area has the effect on the sea water. There is no obvious effect on atmospheric methane content, and hydrate drilling has no obvious effect on the regional environment.
【作者单位】：国土资源部海底矿产资源重点实验室;中国地质调查局广州海洋地质调查局;国家海洋局第三海洋研究所;
【基金】：中国地质调查局项目(GZH201100311) 国土资源部海底矿产资源重点实验室开放基金项目(KLMMR-2013-A-35) 国家自然科学基金项目(91228201)
【分类号】：P618.13

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