海底水合物冰丘的特征及意义

发布时间：2018-01-23 03:42

本文关键词： 海底水合物冰丘水合物似海底反射运移通道热流　出处：《海洋地质与第四纪地质》2017年01期 　论文类型：期刊论文

【摘要】：海底水合物冰丘是一种特殊的海底构造,外观表现从平滑浑圆的陡峭丘状体变化到粗糙不平的缓斜丘状体。地震剖面上,内部常表现为空白反射,并与似海底反射(BSR)紧密相关。归纳了前人对海底水合物冰丘的研究。综合分析认为规模较大的海底水合物冰丘通常形成于高通量汇聚型流体运移通道附近;海底水合物冰丘的出现可能指示了下部水合物及油气藏的赋存和大陆边缘汇聚型流体的运移;同时,在汇聚型流体运移条件下,伴随着流体向上运移的深部热流和高盐度水可能导致BSR深度变浅;此外,水合物冰丘的形成与发育为动态过程,其形成过程可分为水合物成核、聚集/冰丘型以及分解/冰丘垮塌3个阶段。开放型流动系统中形成的水合物丘的气体来源于"深部"沉积物渗滤的外部流体,可形成规模较大、高饱和度的水合物矿产,具有勘探价值。为更好地认识海底水合物冰丘演化史以及其与汇聚型运移通道、BSR分布位置等之间的关系,需要进一步开展海底调查、高精度多道地震调查,并结合地球化学等方法进行综合评价研究。
[Abstract]:Hydrate ice mound is a kind of special submarine structure, its appearance changes from smooth and round steep dome to rough slowly inclined mound. On seismic profile, the interior is often reflected by blank. And BSRs are similar to those of sea floor reflectors. It is concluded that the large scale submarine hydrate ice mound is usually formed near the high-flux convergent fluid migration channel. The occurrence of submarine hydrate ice dunes may indicate the occurrence of lower hydrates and oil and gas reservoirs and the migration of convergent fluids on the continental margin. At the same time, under the convergent fluid migration condition, the deep heat flow and the high salinity water accompanied by the upward migration of the fluid may lead to the shallowness of the BSR depth. In addition, the formation and development of hydrate ice mound is a dynamic process, which can be divided into hydrate nucleation. The gas of hydrate mound formed in the open flow system comes from the external fluid of "deep" sediment infiltration and can be formed on a large scale. High saturation hydrate minerals are of exploration value. In order to better understand the evolution history of submarine hydrate ice dunes and its relationship with the distribution of BSR in convergent migration channels. It is necessary to further carry out submarine survey, high precision multi-channel seismic survey and comprehensive evaluation study with geochemical methods.
【作者单位】：中国地质大学(北京)海洋学院;中国石油勘探开发研究院廊坊分院;中国科学院广州能源研究所中国科学院天然气水合物重点实验室;中国科学院广州天然气水合物研究中心;
【基金】：中国石油-中国科学院科技合作项目(2015A-4813) 中国石油油气勘探科技项目(2016B-4901)
【分类号】：P736.1;P618.13
【正文快照】： 3.中国科学院广州能源研究所,中国科学院天然气水合物重点实验室,广州510640;4.中国科学院广州天然气水合物研究中心,广州510640)海域天然气水合物主要赋存在大陆边缘的斜坡地带、隆起等水深大于300m的深水环境[1]。海底水合物在特定的温度、压力和盐度条件下保持稳定[2],通常

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