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在GD油田复杂油藏描述中应用叠前纵横波弹性阻抗反演,精确地进行了油藏岩性的划分。利用三个或三个以上部分叠加数据,进行纵横波弹性阻抗联立反演,既克服了因叠后地震反演结果单一而不能满足复杂储层描述的需求,又避免了由于叠前道集信噪比低造成反演结果不稳定的缺陷。本文论述了叠前弹性波阻抗反演的基本原理,结合GD地区实际资料,对反演过程中涉及的角道集子波提取、层位标定、横波速度预测、弹性参数提取与解释等关键步骤进行了详细研究,指出基于测井资料分析的多种弹性参数综合解释是提高叠前地震反演应用效果的关键。
The application of prestack shear wave elastic impedance inversion in the description of complex reservoirs in the GD oilfield has accurately separated the reservoir lithology. Using three or more partial superposition data, simultaneous inversion of S-wave elastic impedance not only overcomes the need of complex reservoir description due to the single result of post-stack seismic inversion, but also avoids the problem that the pre- The low signal-to-noise ratio causes the instability of inversion results. In this paper, the basic principle of prestack elastic wave impedance inversion is discussed. Combined with the actual data of GD region, the key steps of wavelet extraction, horizon calibration, shear wave velocity prediction, elastic parameter extraction and interpretation involved in the inversion process are carried out The detailed study shows that the comprehensive interpretation of multiple elastic parameters based on well data analysis is the key to improve the application of prestack seismic inversion.