GOMCRUST - The crustal-scale extension of the 2004 BP velocity model for long-offset OBN acquisition setting

A. Górszczyk, S. Sambolian, S. Operto
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Abstract

Summary We present an extension of the 2004 BP velocity model which is suitable for the assessment of cutting-edge seismic imaging methods as FWI applied to ultra long-offset ocean-bottom node (OBN) acquisitions. The 2004 BP model is routinely utilized to benchmark various velocity-model building approaches - in particular those developed to tackle the challenges encountered in geological settings comprising salt structures. Those challenges are typically related to the correct reconstruction of the subsalt structures or the sharp velocity contrasts between the salt bodies and the surrounding sediments. To make this model suitable for testing the emerging long-offset OBN acquisitions, we embed the original 2004 BP model within a crustal-scale velocity model inspired by the structural interpretation of the tomographic results from the GUMBO experiment (Gulf of Mexico). The resulting model allows for wavefield propagation within the rifted continental crust and the upper mantle and therefore for the undershooting of the salt and subsalt structures. Consequently, there is no need for extrapolation of the original BP model boundaries or resizing/resampling of its spatial dimensions. The GOMCRUST can therefore be seen as a geologically consistent evolution of the 2004 BP model, which allows to benchmark various seismic imaging workflow with long-offset OBN surveys.
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GOMCRUST - 2004年BP速度模型在长偏移OBN采集背景下的地壳尺度扩展
我们提出了2004年BP速度模型的扩展,该模型适用于评估前沿地震成像方法,如FWI应用于超长偏移海底节点(OBN)采集。2004年BP模型通常用于各种速度模型构建方法的基准测试,特别是那些为解决包含盐构造的地质环境中遇到的挑战而开发的模型。这些挑战通常与正确重建盐下结构或盐体与周围沉积物之间的急剧速度对比有关。为了使该模型适用于测试新出现的长偏移OBN获取,我们将原始的2004年BP模型嵌入到地壳尺度速度模型中,该模型的灵感来自GUMBO实验(墨西哥湾)层析成像结果的结构解释。由此得出的模型考虑了波场在断裂的大陆地壳和上地幔内的传播,因此考虑了盐层和盐下构造的下冲。因此,不需要对原始BP模型边界进行外推,也不需要对其空间维度进行调整/重新采样。因此,GOMCRUST可以被视为2004年BP模型的地质一致性演化,该模型允许使用长偏移OBN调查基准各种地震成像工作流程。
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