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我国东海冲绳海槽是一个年轻弧后盆地,发育高沉积速率、富有机质的新生代陆源沉积,其高热流值和多构造裂隙环境有利于烃类转化和运移,适合海底天然气水合物的形成。相关地质构造分析、底层水温实测以及地球物理调查等工作表明,冲绳海槽具有丰富的天然气水合物资源远景(范德江和杨作升,2004;方银霞等,2005;陈建文,2014)。相对于在海槽中部和南部发现了反映天然气水合物存在的BSR(拟海底反射层)地震反射特征(唐勇等,2003;2005),冲绳海槽北部缺乏天然气水合物的详细实测研究资料。
The Okinawa Trough in the East China Sea is a young back-arc basin with high depositional rate and organic-rich Cenozoic terrigenous sediments. Its high heat flux and multi-structural fissure environment are favorable for the hydrocarbon transformation and migration and are suitable for the formation of gas hydrate in the seabed . The analysis of related geological tectonics, measurements of groundwater temperature and geophysical surveys indicate that the Okinawa Trough is rich in natural gas hydrate resources (Van Dejung and Yang Zusheng 2004; Fang Yinxia et al 2005; Chen Jianwen 2014). In contrast to the seismic reflection characteristics of BSR (Quasi-Seabed Reflecting Layer) reflecting the presence of gas hydrates in the central and southern troughs (Tang et al., 2003; 2005), detailed experimental data on the lack of gas hydrate in the northern Okinawa Trough were found.