High-resolution resistivity imaging of marine gas hydrate structures by combined inversion of CSEM towed and ocean-bottom receiver data
High-resolution resistivity imaging of marine gas hydrate structures by combined inversion of CSEM towed and ocean-bottom receiver data
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DOI：
10.1093/gji/ggy227
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发表时间：
2018-06
影响因子：
2.8
通讯作者：
Eric Attias;K. Weitemeyer;S. Hölz;S. Naif;T. Minshull;A. Best;A. Haroon;M. Jegen-Kulcsar;C. Berndt
中科院分区：
文献类型：
--
作者：
Eric Attias;K. Weitemeyer;S. Hölz;S. Naif;T. Minshull;A. Best;A. Haroon;M. Jegen-Kulcsar;C. Berndt
我们介绍了天然气水合物管状结构的高分辨率电阻率成像，该成像来自海洋可控源电磁(CSEM)反演，该反演结合了从挪威近海Nyegga地区获得的拖曳和海底电场接收器数据。应用于拖曳接收器数据的二维CSEM反演发现了四个新的突出的垂直电阻特征，它们可能是天然气水合物结构，位于一个主要的天然气水合物管状结构附近，被称为CNE03麻点。由CSEM数据反演得到的电阻率模型高分辨率地解析了CNE03水合物的结构，这是通过与地震约束反演的比较得出的。我们的结果表明，通过同时反演海底和拖曳接收器CSEM数据，可以有效地圈定浅层天然气水合物的垂直特征。这里采用的方法可用于绘制和监测海底矿化、淡水水库、二氧化碳封存地点和近地表地热系统。
We present high-resolution resistivity imaging of gas hydrate pipe-like structures, as derived from marine controlled-source electromagnetic (CSEM) inversions that combine towed and ocean-bottom electric field receiver data, acquired from the Nyegga region, offshore Norway. Two-dimensional CSEM inversions applied to the towed receiver data detected four new prominent vertical resistive features that are likely gas hydrate structures, located in proximity to a major gas hydrate pipe-like structure, known as the CNE03 pockmark. The resistivity model resulting from the CSEM data inversion resolved the CNE03 hydrate structure in high resolution, as inferred by comparison to seismically constrained inversions. Our results indicate that shallow gas hydrate vertical features can be delineated effectively by inverting both ocean-bottom and towed receiver CSEM data simultaneously. The approach applied here can be utilised to map and monitor seafloor mineralisation, freshwater reservoirs, CO2 sequestration sites and near-surface geothermal systems.