摘要
讨论了南海的地形地貌特征，以及中新生代的构造运动历程；认识到中中新世之前，这里经历了一系列构造运动，但在中中新世之后，这里无构造运动，只是发生了区域沉降。由此认为南海应有丰富的天然气水合物矿藏，进而估算了南海天然气水合物的总资源量达643．5亿──772．2亿t油当量。
The area where water depths are more than 400m is 93 ×104 km2, there may ex-ist gas hydrates. The topography on the slopes and rises is complex,there are a lot ofsea mounts, sea hills,troughs, sea valleys, submerged reefs and shoals. There were a se-ries of tectonic movements in Mesozoic and Cenozoic in the area, but there was no move-ment since end of middle Miocene. There was regional subsidence, and a sub--horizontalsediments were deposited in a stable environment since end of middle Miocene. Underthese sub--horizontal sediments there were many faults formed by the movements. This isfavourable for the up--going fluid from below sediments. The sediments since end of mid-dle Miocene have been in the stable zone of gas hydrate,the gases in the fluid from belowsediments flowed up along the faults into the sediments since middle Miocene as a gassource forming the gas hydrate,including the gases formed in the sediments since middleMiocene. Therefore, we believe that there is abundant gas hydrate in the slopes and risesof the South China Sea. We calculated the gas hydrate resources in the area according tothe data obtained from the South China Sea area and world's parameters on the gas hy-drate. The total resources are 6. 435 ×1013 --7. 722 ×l0l3 m3 gases.
出处
《热带海洋学报》
CAS
CSCD
北大核心
2001年第2期20-28,共9页
Journal of Tropical Oceanography
基金
国家重点基础研究项目(G2000046705)资助
关键词
地形地貌
构造运动
天然气水合物
资源量
南海
topography and geomorphology
tectonic movement
gas hydrate
resources
South China Sea
