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通过数值分析,发现对应于悬浮模式、颗粒接触模式的等效介质模型A,B预测的含水合物沉积物纵波速度、横波速度及泊松比存在物理认识上的缺陷,单独考虑水合物微观模式为悬浮模式或颗粒接触模式并不合理.认为非胶结水合物的微观模式与其饱和度存在关联,并运用拉格朗日插值方法建立了新的非胶结含水合物沉积物修正等效介质速度模型.该模型体现了水合物饱和度对于水合物微观模式的影响,数值分析结果表明新模型预测结果更合理.基于新模型对非胶结含水合物沉积物的地震波场进行了数值模拟,探讨了似海底反射及空白带的形成机理,对实际水合物地震勘探中发现的不同地震波场特征对应的水合物分布模式进行了解释.
Through numerical analysis, it is found that there are physical defects in hydrate sediment P-wave velocity, shear wave velocity and Poisson’s ratio predicted by equivalent medium models A and B of suspension mode and particle contact mode. Considering hydrate micro-mode As the suspension mode or particle contact mode is not reasonable.It is considered that the non-cement hydrate microscopic mode is related to its saturation, and the use of Lagrange interpolation method to establish a new non-cement hydrate sediment correction equivalent medium velocity model The model shows the effect of hydrate saturation on the hydrate microscopic model, and the numerical analysis shows that the new model predicts a more reasonable result.The seismic wavefield of the non-hydrated hydrate sediment is numerically simulated based on the new model, Seafloor reflection and blank band formation mechanism, the hydrate distribution patterns corresponding to different seismic wavefield features found in actual hydrate seismic exploration are explained.