Control of the geomorphology and gas hydrate extent on widespread gas emissions offshore Romania
Control of the geomorphology and gas hydrate extent on widespread gas emissions offshore Romania
复制标题
控制地貌和天然气水合物范围对罗马尼亚近海广泛气体排放的影响
DOI：
10.1051/bsgf/2017182
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发表时间：
2016
影响因子：
--
通讯作者：
S. Ker
中科院分区：
文献类型：
--
作者：
V. Riboulot;A. Cattaneo;C. Scalabrin;A. Gaillot;G. Jouet;Grégory Ballas;T. Marsset;S. Garziglia;S. Ker
黑海的罗马尼亚部分值得注意，因为多瑙河深海扇是世界上最大的沉积物沉积系统之一，被认为是世界上最孤立的海洋，地球上最大的缺氧水体和独特的能源丰富的海洋。多瑙河三角洲近岸黑海沉积物由于高沉积速率、有机质的存在和缺氧条件，具有富气特征，具有模拟底反射（BSR）特征。近20年来BSR的地形图显示其分布广泛，表明水合物聚集发育广泛，天然气水合物潜力巨大。结合2015年GHASS考期获取的新老数据集，对多瑙河峡谷东北部大陆坡进行了地貌分析，并与水柱中天然气渗漏的空间分布和天然气水合物稳定带的预测范围进行了比较。这一分析提供了新的证据，证明了地貌环境和天然气水合物程度在控制观测到的天然气喷出和天然气火炬在水柱中的位置方面的作用。如今，气体燃烧被认为是海洋碳收支的重要来源，也可能是大气碳收支的重要来源。
The Romanian sector of the Black Sea deserves attention because the Danube deep-sea fan is one of the largest sediment depositional systems worldwide and is considered the world's most isolated sea, the largest anoxic water body on the planet and a unique energy-rich sea. Due to the high sediment accumulation rate, presence of organic matter and anoxic conditions, the Black sea sediments offshore the Danube delta is rich in gas and thus shows Bottom Simulating Reflectors (BSR). The cartography of the BSR over the last 20 years, exhibits its widespread occurrence, indicative of extensive development of hydrate accumulations and a huge gas hydrate potential. By combining old and new datasets acquired in 2015 during the GHASS expedition, we performed a geomorphological analysis of the continental slope north-east of the Danube canyon compared with the spatial distribution of gas seeps in the water column and the predicted extent of the gas hydrate stability zone. This analysis provides new evidence of the role of geomorphological setting and gas hydrate extent in controlling the location of the observed gas expulsions and gas flares in the water column. Gas flares are today considered an important source of the carbon budget of the oceans and, potentially, of the atmosphere.