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GIS Analysis Of Pockmarks From 3D Seismic Exploration Surveys

机译：基于3D地震勘探调查的麻点的GIS分析

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Today Geographical Information Systems (GIS) are present at all stages of Exploration and Productionprocess. Its strength is the ability to combine datasets from each specialty of Geosciences: geology,geophysical, geochemistry, geotechnic, metocean. GIS are widely known for being a powerful tool togather and archive all geographical data but one of the major strength of a GIS is its capacity to be usedfor analyzing the data. The proposed GIS approach is a real added value for seabed geohazards assessmentfor subsea layout validation. The semi-automatic method of seabed pockmarks characterization using GISand multibeam datasets established by the British Geological Survey in 2012 (Gafeira et al. 2012) hasbeen re-used and improved on exploration 3D seismic data. 1688 seabed pockmarks are mapped over aparticular area of interest offshore West Africa. Geomorphologic characteristics are extracted andcross-correlated with 3D seismic amplitude for each pockmark. Correlation coefficients are calculated tohighlight the link between pockmark shape and amplitude (indirectly pockmark activity).A second horizon extracted from 3D seismic data has been used to map buried pockmarks, allowinga comparison with seabed pockmarks. The migration path of each pockmark is automatically generated.Orientation of the migration line is found to be consistent with seabed currents, confirming the influenceof seabed currents on pockmark migration. Density maps set up for the seabed and buried pockmarksshow particular areas with a strong increase of pockmark density, other areas more stable and some areaswith a decline of activity.
机译：如今，地理信息系统（GIS）处于勘探和生产的各个阶段 过程。它的优势在于能够整合来自各个地球科学专业的数据集：地质， 地球物理，地球化学，岩土工程，海洋。 GIS以其强大的功能而广为人知 收集和存档所有地理数据，但是GIS的主要优势之一是其使用能力 用于分析数据。提议的GIS方法是海床地质灾害评估的真正附加值 用于海底布局验证。基于GIS的海床麻点刻画半自动方法。 英国地质调查局（Gafeira et al。2012）在2012年建立的多波束和多波束数据集 已在勘探3D地震数据中重复使用和改进。 1688个海底麻点被映射到一个 西非近海特别感兴趣的地区。提取地貌特征并 每个麻点与3D地震振幅互相关。计算相关系数为 突出显示麻点形状和幅度之间的联系（间接麻点活动）。 从3D地震数据中提取的第二层视线已被用于绘制掩埋的麻点，从而 与海底麻点的比较。每个麻袋的迁移路径是自动生成的。 发现迁移线的方向与海床洋流一致，证实了其影响 海床洋流对痘痕迁移的影响。为海床和地下麻点建立密度图 显示特定区域的麻点密度显着增加，其他区域更稳定，而某些区域 活动减少。

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