【摘要】 天然气水合物是甲烷等天然气在高压、低温条件下形成的冰状固体物质。据估算,全球天然气水合物中碳的含量等于石油、煤等化石能源中碳含量的2倍。在人类面临化石能源即将枯竭的时候,各国科学家和政府都把目光投向这一未来能替代化石能源的新能源。新生代构造演化历史、沉积条件、沉积环境等显示,南海具有生成和蕴藏巨大天然气水合物资源的条件;南海海域的地震反射剖面多处显示存在BSR反射波;2007年已钻探见到水合物样品。东海冲绳海槽在第四纪的沉积速率高(10~40cm/ka),槽坡存在泥底辟构造和断裂活动,从上新世以来发生过两次构造运动,这些对天然气水合物的形成是十分有利的;因此,中国海域的天然水合物资源是十分丰富的,在不远的将来它可能成为新的替代能源。更多还原

【Abstract】 The forming conditions of gas hydrate in the China seas according to the physicaloceanography,palaeo-climate,sedimentary environment,and tectonic environment are discussed in this paper.The researching results show that the organism producibility is high and there are rich organic matters in sediments of the period 2,4,6 of oxygen-isotope in the South China Sea.In these periods the sedimentary velocity was very high,and there are very good material conditions for the formation of gas hydrate.In addition,since Pliocene,the Philippine Sea plate has collided with Asian plate in Taiwan area,extruding the northeast part of the South China Sea along northwest direction.Owning to the extruding force in the sediments the fluid is very active and it is benefit for the formation of the gas hydrate.We have collected the sedimentary samples containing the gas hydrates through the drilling on the northern slope of the South China Sea in 2007.In the Okinawa Trough of the East China Sea,some mud volcanoes or mud diapir structures and the active faults were found in the west slope of the trough.The sedimentary rates are high in Quaternary in the trough,from 10 cm/ka to 40 cm/ka.The BSRs in the seismic profiles show that there should exist the gas hydrates in the Okinawa Trough.For above reasons,we infer that gas hydrates are rich in the China seas.更多还原