Numerical studies of gas hydrate evolution time in Shenhu area in the northern South China Sea
Numerical studies of gas hydrate evolution time in Shenhu area in the northern South China Sea
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DOI：
10.31035/cg2018054
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发表时间：
2019-03
期刊：
影响因子：
4.5
通讯作者：
Yunxin Fang;Jing’an Lu;Jinqiang Liang;Z. Kuang;Yuncheng Cao;Duofu Chen
中科院分区：
文献类型：
--
作者：
Yunxin Fang;Jing’an Lu;Jinqiang Liang;Z. Kuang;Yuncheng Cao;Duofu Chen
虽然神狐海域一直是中国海相天然气水合物勘探研究的热点和热点，但该海域天然气水合物的成藏机制仍存在争议。天然气水合物的形成速率和演化时间是研究神狐海域天然气水合物形成的重要依据。本文基于GMGS3-W19钻井现场实测氯离子浓度高于海水值的正异常特征，对GMGS3-W19钻井现场天然气水合物形成时间进行了数值模拟。模拟结果表明，当水合物达到实测饱和度时，天然气水合物的形成速率与氯化物浓度呈正相关。GMGS3-W19位点天然气水合物形成时间约为30 ka。此外，实测氯化物浓度与原位氯化物浓度基本一致，表明GMGS3-W19位点天然气水合物形成速度非常快，演化时间相对较短。©2019中国地质编辑部
ABSTRACT Although the Shenhu sea area has been a topic and focus of intense research for the exploration and study of marine gas hydrate in China, the mechanism of gas hydrate accumulation in this region remains controversial. The formation rate and evolution time of gas hydrate are the critical basis for studying the gas hydrate formation of the Shenhu sea area. In this paper, based on the positive anomaly characteristics of chloride concentration that measured in the GMGS3-W19 drilling site is higher than the seawater value, we numerically simulated the gas hydrate formation time of GMGS3-W19 site. The simulation results show that the gas hydrate formation rate positively correlates with the chloride concentration when the hydrate reaches the measured saturation. The formation time of gas hydrate in the GMGS3-W19 site is approximately 30 ka. Moreover, the measured chloride concentration is consistent with the in-situ chloride concentration, indicating that the formation rate of gas hydrate at the GMGS3-W19 site is very fast with a relatively short evolution time. ©2019 China Geology Editorial Office.