摘要
从物理海洋、古气候、沉积环境和构造环境分析入手,研究了南海天然气水合物的形成条件。研究结果表明,在整个南海海域,天然气水合物生成的条件是存在差别的。南海东北部,在氧同位素2、4、6期,由于菲律宾海的高盐度海水的注入,使这里的生物生产率特别高,陆坡上沉积了丰富的有机物质,加上此期间该处的沉积速率高,为天然气水合物的生成提供了物质条件;另外,自中新世末以来,由于菲律宾海板块与欧亚板块在台湾地区发生碰撞,对南海北部产生北西向挤压,加快了流体在沉积物中的活动,为天然气水合物的生成提供了良好的构造环境。因此认为南海东北部陆坡应是南海天然气水合物最丰富的地区。
We have studied forming condition of gas hydrate in the South China Sea according to the physical oceanography, palaeo-climate, sedimentary environment, and tectonic environment. The researching results tell us that there are different forming conditions of gas hydrate in the South China Sea. In the northeast part of the South China Sea the high salinity water comes from the Philippine Sea, therefore, biologic productivity was high and there was rich organic matter in sediments during the periods of oxygen-isotopes 2,4 and 6. In these periods the sedimentation rate was very high, so there were very good material conditions for formation of gas hydrate. In addition, from the end of Miocene to present, the Philippine Sea plate collided with Asian plate in Taiwan Region,extruding the northeast part of the South China Sea along northwest direction. The extruding force made fluid in the sediments very active,and this is very good for the formation of gas hydrate.From the above reason, we believe that there should be rich gas hydrate in the northeast slope of the South China Sea.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2005年第2期81-90,共10页
Marine Geology & Quaternary Geology
基金
国家重点基础研究发展规划(973)项目(G2000046705)
国土资源部重大科技项目"中国大陆岩石圈三维结构"
