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南海北部甲烷渗漏活动存在的证据:近底层海水甲烷高浓度异常

, PP. 69-75

Keywords: 天然气水合物,近底层海水,甲烷羽流

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Abstract:

用吹扫-捕集法对东沙群岛西南和西沙海槽附近海域5个站位水柱中的甲烷浓度进行了测定,在其中的3个站位发现了甲烷高浓度异常。在东沙群岛西南海域的E105A和E106两站位近底层海水中甲烷浓度均出现异常增加,其值分别为4.25和10.64nmol/dm3。在西沙海槽附近的E413站位甲烷异常出现在1750,1900和2050m深的近底层水中,浓度分别达5.17,8.48和8.70nmol/dm3。在近底层海水中出现的甲烷高浓度异常是由于沉积物下部甲烷渗漏活动造成的,结合前人在这两个海域沉积物的地球物理和化学调查资料,认为可能是与冷泉渗漏或天然气水合物分解有关。2007年5月在探测到甲烷高浓度明显异常的东沙群岛西南神弧海域,获得了天然气水合物的实物样品,但是西沙海槽附近海域近底层水的甲烷高浓度异常是来源于天然气水合物还是来源于冷泉需要进一步加以确认。

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