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矿床地质  2002 

南海潜在天然气水合物藏的成因及形成模式初探

Keywords: 南海,天然气水合物藏,成因,形成模式

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Abstract:

文章分析了南海部分地区浅表层沉积物酸脱气烃类气体的组成及ODP184航次部分岩屑样品罐顶气的组成与同位素特征,总结了南海部分气苗的烃类气体与同位素组成特征,并根据它们的同位素值估算了这些气体源的深度,估算值与实际值较吻合。在此基础上对这些烃类气体的成因进行了判别,结果为:北部陆坡的烃类主要来源于深部的裂解气,可能还有浅部生物气的混合;南部陆坡的烃类主要以浅部的生物气为主,还有热解气的混合。文中还对南海潜在天然气水合物藏的形成模式进行了初步的探讨。这些认识将有助于对南海天然气水合物的形成过程及与同一构造背景下油气藏的关系的理解,对今后的普查勘探具有一定的意义。

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