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研究含天然气水合物沉积物的岩石物性模型与似海底反射层的振幅随入射角变化 (AVA)特征 .基于时间平均 -Wood加权方程、三相介质波传播理论模型和弹性模量模型 ,计算并阐述含天然气水合物岩石弹性参数与水合物饱和度、含游离气岩石弹性参数与游离气饱和度的关系 ;给出不同模型AVA特征 .结果表明 ,不同天然气水合物饱和度、不同游离气饱和度的各种组合呈现形态相似但反射系数值不同的AVA特征 .
The rock physics model of gas hydrate-bearing sediments and AVA-like characteristics of seafloor reflector are studied.According to time-averaged-Wood weighted equation, three-phase medium wave propagation model and elastic modulus model, The relationship between elastic parameters and hydrate saturation of gas hydrate-bearing rocks, rock elastic parameters with free gas and free gas saturation are described, and the AVA characteristics of different models are given.The results show that the gas hydrate saturation of different gas hydrates, different free gas saturation The various combinations show AVA features that are morphologically similar but reflectance values differ.