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首页> 外文期刊>Earth, planets and space: EPS >Three-component OBS-data processing for lithology and fluid prediction in the mid-Norway margin, NE Atlantic
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Three-component OBS-data processing for lithology and fluid prediction in the mid-Norway margin, NE Atlantic

机译：用于大西洋中北部大西洋中部岩性和流体预测的三成分OBS数据处理

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In 1992, a comprehensive three-component ocean bottom seismic survey was performed in the central and northern area of the Voring Basin, offshore mid-Norway, NE Atlantic. An important part of the data acquisition program consisted of a local survey with 20 Ocean Bottom Seismographs (OBS) dropped at approximately 200 m interval in 1300 m water depth. The main purpose of the local survey was to acquire densely sampled P- and S-wave reflection data above a seismic flatspot anomaly observed earlier, in order to more accurately predict if hydrocarbons could be related to it. The conventional reflection data processing methods applied to the vertical components included predictive deconvolution in order to attenuate low frequency ringing, near offset mute and a series of constant velocity stacks in order to obtain the optimal velocity function. The final result is a "trouser" shaped, high resolution V_z stacked section with minor influence of water multiples. The inline (V_x) component contains no strong multiples, and extensive near trace muting was hence not necessary to apply for this component. Velocity analysis together with ray-tracing modelling indicate the P-S-converted shear waves (reflections) represent the dominant mode. The results of the interpretation and modelling indicated a V_p/V_s-ratio of approximately 2.6 in the overburden, which suggests domination of partly unconsolidated shale, while the V_p/V_s-ratio in the assumed reservoir was approximately 1.8, which indicates a more sand dominated facies. Outside the flatspot area a higher V_p/V_s-ratio ratio (approximately 2.0) was estimated, indicating that hydrocarbons could be present in the assumed reservoir.
机译：1992年，在北大西洋东北部中途挪威Voring盆地的中部和北部进行了一次全面的三部分海底地震调查。数据采集​​计划的重要组成部分包括对当地的20处海洋底部地震仪（OBS）进行的局部勘测，它们分别在1300 m的水深中以200 m的间隔下落。局部调查的主要目的是获取早先观测到的地震平斑异常上方的密集采样的P波和S波反射数据，以便更准确地预测碳氢化合物是否与它有关。应用于垂直分量的常规反射数据处理方法包括预测性去卷积，以减弱低频振铃，近偏移静噪和一系列等速堆栈，以获得最佳速度函数。最终结果是“裤子”形的高分辨率V_z堆叠部分，水倍数的影响较小。内联（V_x）组件不包含强倍数，因此无需对此组件应用广泛的近迹屏蔽。速度分析和射线追踪模型表明，P-S转换的剪切波（反射）代表了主导模式。解释和建模的结果表明，上覆岩层的V_p / V_s比率约为2.6，表明部分未固结页岩占主导地位，而假定储层的V_p / V_s比率约为1.8，这表明以砂土为主相。在平斑区域之外，估计了较高的V_p / V_s比率（约2.0），表明假定的储层中可能存在碳氢化合物。

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