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为了更好地研究水合物的展布形态和赋存情况,对西沙海域天然气水合物的准三维地震资料进行无井波阻抗反演。详细论证针对水合物无井波阻抗反演的处理方法:根据水合物的地球物理特征对地震资料进行零相位化处理;根据地震资料本身特征,在工区多个构造稳定区提取地震子波,对求取的子波平均化保证子波的稳定性;根据叠加速度,通过网格插值、平滑、滤波、转换求取三维低频阻抗模型。最终得到的反演结果地质现象清楚,能够较准确地反映水合物的空间展布情况,利于后续水合物的综合分析研究。
In order to better study the distribution and occurrence of hydrate, quasi-3D seismic data of gas hydrate in the Xisha area are retrieved without well impedance. Demonstration of well hydrate-free well wave impedance inversion processing method: According to the hydrate geophysical characteristics of the seismic data zero phase processing; According to the characteristics of the seismic data, multiple structural stability areas in the work area to extract seismic wavelet, Take the average of the wavelet to ensure the stability of the wavelet; According to the stacking speed, through the grid interpolation, smoothing, filtering, conversion to obtain three-dimensional low-frequency impedance model. The final result of the inversion shows that the geological phenomenon is clear, which can reflect the spatial distribution of hydrate more accurately and is conducive to the comprehensive analysis of subsequent hydrates.