P-T stability conditions of methane hydrate in sediment from South China Sea

• 作 者: Shicai Sun Yuguang Ye Changlin
• 机 构: Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Qingdao I
• 出 处: 天然气化学（英文版）
• 发表日期: 2004年期
• 关键词: sediment from South China Sea seafloor water methane hydrate stability condition
• 基金项目: 国家重点基础研究发展规划(973计划);the Special Fund for Ministry of Land and Resources research of China in the Public Interest;the Natural Science Foundation of Shandong Province of China

For reasonable assessment and safe exploitation of marine gas hydrate resource,it is important to determine the stability conditions of gas hydrates in marine sediment.In this paper,the seafloor water sample and sediment sample (saturated with pore water) from Shenhu Area of South China Sea were used to synthesize methane hydrates,and the stability conditions of methane hydrates were investigated by multi-step heating dissociation method.Preliminary experimental results show that the dissociation temperature of methane hydrate both in seafloor water and marine sediment,under any given pressure,is depressed by approximately -1.4 K relative to the pure water system.This phenomenon indicates that hydrate stability in marine sediment is mainly affected by pore water ions.