Methodological studies on imaging the pre-Cenozoic in the South Yellow Sea based on seismic numerical modeling data
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摘要:
分析了南黄海前新生代地震勘探地质条件，认为该区地下地震反射界面速度反差可高达1.5~3.0倍。在建立了南黄海前新生代地震勘探1D和2D地震波传播模型的基础上，通过对模拟采集数据进行分析，提出了该区前新生代地震成像的主要问题。通过对模拟采集数据进行成像处理发现，通常的叠加方法在一定程度上能够压制多次波，但前新生代地层反射波不能成像；在不考虑速度模型建立的情况下，在压制鬼波、SRME+高精度拉动变换压制自由表面多次波后，Kirchhoff积分叠前深度偏移方法能够使前新生代复杂地质构造基本成像，而叠前逆时深度偏移方法能够使前新生代复杂地质构造精确成像。
Abstract:The analysis of pre-Cenozoic seismic geological settings in the South Yellow Sea suggests that the ratio of seismic velocity contrast of subsurface reflectors reaches as high as 1.5 to 3.0. In the case, 1D and 2D seismic wave velocity models are established with logging and seismic data. After analyzing the modelling data, we found the main problems of imaging pre-Cenozoic deposits in the South Yellow Sea. By processing the modelling data, it is realized that although the conventional stack can attenuate multiples but pre-Cenozoic reflections cannot be imaged. If we did not consider velocity model building, after deghosting and attenuating free surface-related and interbedded multiples by SRME and high resolution Radon transform, Kirchhoff integral prestack depth migration can essentially make pre-Cenozoic complex geological structures well imaged, and prestack reverse-time depth migration method can precisely image the complex pre-Cenozoic geological structures. The studies have provided an important guidance for seismic exploring pre-Cenozoic complex structures in the South Yellow Sea.
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Key words:
- pre-Cenozoic /
- numerical modelling /
- multiples /
- seismic imaging /
- South Yellow Sea
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表 1 南黄海盆地地层、速度与生储盖组合
Table 1. Stratigraphy, seismic velocity, sources, seas and reservoirs in the South Yellow Sea basin
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