Widespread subseafloor gas hydrate in the Barents Sea and Norwegian Margin

Widespread subseafloor gas hydrate in the Barents Sea and Norwegian Margin
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巴伦支海和挪威边缘广泛分布的海底天然气水合物

DOI:
10.1016/j.epsl.2023.117993
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发表时间:
2023
影响因子:
5.3
通讯作者:
Bünz, S.
Bünz, S.
中科院分区:
地球科学1区
文献类型:
--
作者:
Cook, A.E.;Portnov, A.;Heber, R.C.;Vadakkepuliyambatta, S.;Bünz, S.

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海底下天然气水合物在边缘的分布和浓度尚不清楚,因为这些系统很难远程成像和量化。此外,尚不清楚浅层水合物系统是否与深层油气藏有关。在这里,我们分析了石油工业测井数据在天然气水合物稳定区,发现低浓度的水合物通常发生在巴伦支海和挪威边缘的海底以下。我们使用一套保守的标准,要求电阻率增加至少0.5 Ωm以上的背景电阻率,在一半的分析工业威尔斯井中观察到水合物。水合物的积聚主要发生在水合物稳定带底部之上,厚度从几十厘米到几十米不等。此外,我们发现水合物聚集的威尔斯井与更深的油气藏之间没有关系;水合物就像在有干孔的地区一样可能出现在已确定的油气藏上方(即,没有油气藏)。我们认为,低浓度的水合物,水合物的发生显着高于天然气水合物稳定区的基础上,水合物的发生和更深的油气藏之间缺乏关联意味着这些水合物系统中的气体可能是通过扩散运输,主要是微生物的起源。
The distribution and concentration of subseafloor natural gas hydrate across margins is not well understood, because these systems are challenging to image and quantify remotely. Furthermore, it is unknown if shallow hydrate systems are linked to deeper oil and gas reservoirs. Herein, we analyze petroleum industry well logs with data in the gas hydrate stability zone and find that low concentrations of hydrate commonly occur below the seafloor in the Barents Sea and the Norwegian Margin. We observe hydrate in half of analyzed industry wells using a set of conservative criteria that requires a resistivity increase of at least 0.5 Ωm above background resistivity. Hydrate accumulations occur significantly above the base of the hydrate stability zone, in layers with thicknesses ranging from tens of centimeters to tens of meters. Moreover, we find that there is no relationship between wells with hydrate accumulations and deeper oil and gas reservoirs; hydrate is just as likely to occur above identified oil and gas reservoirs as in areas with dry holes (i.e., no oil or gas reservoir). We argue the low concentration of hydrate, the occurrence of hydrate significantly above the base of the gas hydrate stability zone, and the lack of association between hydrate occurrence and deeper oil and gas reservoirs implies that the gas in these hydrate systems is likely transported via diffusion and is primarily microbial in origin.
以巴伦支海为例的被动大陆边缘的冰川沉积物
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