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首页> 外文期刊>Bulletin of earthquake engineering >An integrated shear-wave velocity model for the Groningen gas field, The Netherlands
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An integrated shear-wave velocity model for the Groningen gas field, The Netherlands

机译：荷兰格兰丁根气田的综合剪切波速模型

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摘要

A regional shear-wave velocity (V-S) model has been developed for the Groningen gas field in the Netherlands as the basis for seismic microzonation of an area of more than 1000 km(2). The V-S model, extending to a depth of almost 1 km, is an essential input to the modelling of hazard and risk due to induced earthquakes in the region. The detailed V-S profiles are constructed from a novel combination of three data sets covering different, partially overlapping depth ranges. The uppermost 50 m of the V-S profiles are obtained from a high-resolution geological model with representative V-S values assigned to the sediments. Field measurements of V-S were used to derive representative V-S values for the different types of sediments. The profiles from 50 to 120 m are obtained from inversion of surface waves recorded (as noise) during deep seismic reflection profiling of the gas reservoir. The deepest part of the profiles is obtained from sonic logging and V-P-V-S relationships based on measurements in deep boreholes. Criteria were established for the splicing of the three portions to generate continuous models over the entire depth range for use in site response calculations, for which an elastic half-space is assumed to exist below a clear stratigraphic boundary and impedance contrast encountered at about 800 m depth. In order to facilitate fully probabilistic site response analyses, a scheme for the randomisation of the V-S profiles is implemented.
机译：区域剪切波速度（V-S）模型是为荷兰的格罗宁根天然气领域开发的，作为地震微微型面积超过1000公里的基础（2）。延伸到近1公里的深度的V-S模型是对灾害建模和由于该地区诱导地震的风险建模的基本投入。详细的V-S配置文件由覆盖不同，部分重叠深度范围的三种数据集的新颖组合构成。 V-S型材的最高50米从具有分配给沉积物的代表性V-S值获得的高分辨率地质模型获得。 V-S的现场测量用于导出不同类型的沉积物的代表性V-S值。在气体储层的深层地震反射分析期间，从50至120μm的反转获得50至120μm的曲线。根据深层钻孔的测量，可以从声波测井和V-P-V-S关系获得型材的最深部分。建立标准，用于拼接三个部分以在整个深度范围内产生连续模型，以便在现场响应计算中使用，因此假设弹性半空间存在于明显的地层边界，并且在大约800米处遇到的阻抗对比度深度。为了促进完全概率的站点响应分析，实施了用于V-S配置文件的随机化的方案。

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