中文摘要：

南海琼东南盆地发现的高压泥底辟构造、海底“气烟囱”和天然气冷泉表明该地区可能存在着渗漏系统天然气水合物藏．假定在该区直径为1500m的甲烷渗漏区内，甲烷渗漏通量为1000kmol／a，甲烷水合物沉积层的温度范围为3～20℃，根据水合物条形移动界面理论建立传热模型，选取0mbsf、100mbsf、200mbsf和425mbsf分别计算在渗漏和扩散情况下的温度和生长速度变化曲线．结果表明甲烷水合物在沉积层骨架里的固结速度约为0．2nm／s，经过约35000年后渗漏系统将演变成扩散系统．同时，甲烷水合物在渗漏系统里比在扩散系统里的生长速度快约20～40倍．

英文摘要：

The occurrences of diapirs, gas-filled zones and gas plumes in seawater in Qiongdongnan Basin of South China Sea indicate that there may exist seepage system gas-hydrate reservoirs. Assuming there has a methane venting zone of 1500 m in diameter, and the methane flux is 1000 kmol/a, and the temperature of methane hydrate-bearing sediments ranges from 3 ℃ to 20 ℃, then according to the hydrate film growth theory, by numerical simulation, this paper computes the temperatures and velocities in 0 mbsf, 100 mbsf, 200 mbsf, 425 mbsf over discrete length, and gives the change charts. The results show that the cementation velocity in sediments matrix system system of methane hydrate is about 0. 2 nm/s, and the seepage system will evolve into diffusion over probably 35000 years. Meanwhile, the methane hydrate growth velocity in leakage is 20-40 times faster than in diffusion system.