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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。
In 2011-2015, the marine survey of Dongsha and Shenhu hydrate drilling areas was conducted for 5 years and 7 voyages in succession. A large number of seawater hydrology, hydrochemistry and dissolved methane content data were obtained from the study area, Environmental assessment provides good baseline data and pre-harvest environmental baseline. During the investigation, the concentration of methane in the seawater ranged from 0 to 31.4nmol·L -1 with an average concentration of 6.7nmol·L -1, which was higher than the global mean methane concentration in the seawater, indicating that the methane concentration in the South China Sea The value of seawater dissolved methane concentration and its distribution in the study area are not affected by regional seawater hydrological characteristics, seawater chemical characteristics and seasons, etc., and the surface seawater-atmospheric methane exchange is not a single sink or source relationship According to the different time, the exchange of seawater and atmospheric methane exchange exists. The comprehensive survey results show that the methane leakage in the study area has no obvious effect on the seawater and atmospheric methane content, and the hydrate drilling has no obvious influence on the regional environment.