Rock-physics models of hydrate-bearing sediments in permafrost, Qilian Mountains, China
Rock-physics models of hydrate-bearing sediments in permafrost, Qilian Mountains, China
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DOI：
10.1007/s11770-017-0608-y
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发表时间：
2017-03-01
影响因子：
0.7
通讯作者：
Liu Xiao-Xiao
中科院分区：
文献类型：
--
作者：
Liu Jie;Liu Jiang-Ping;Liu Xiao-Xiao
利用K-T方程模型、有效介质模型的模式I和模式II，建立了祁连山多年冻土区水合物沉积物的岩石物理模型。K-T方程模拟了地震波在两相介质中的传播，以确定复合介质的弹性模量。在有效介质模型中，模式I，水合物是一个组成部分的孔隙包裹体在模式I和模式II，它是一个组成部分的矩阵。首先，从测井数据中提取沉积物基质的P波速度、S波速度、密度、体积模量和剪切模量。其次，根据沉积物主要组分的物理性质，利用K-T方程建立了岩石物理模型，并在假设有效介质为不同的水合物充填模式的基础上，建立了两个附加的岩石物理模型。将水合物沉积物的模型和实际速度数据进行了比较，发现水合物充填模式II的岩石物理模型很好地再现了实际数据。
Rock-physics models are constructed for hydrate-bearing sediments in the Qilian Mountains permafrost region using the K-T equation model, and modes I and II of the effective medium model. The K-T equation models the seismic wave propagation in a twophase medium to determine the elastic moduli of the composite medium. In the effective medium model, mode I, the hydrate is a component of the pore inclusions in mode I and in mode II it is a component of the matrix. First, the P-wave velocity, S-wave velocity, density, bulk modulus, and shear modulus of the sediment matrix are extracted from logging data.. Second, based on the physical properties of the main components of the sediments, rockphysics model is established using the K-T equation, and two additional rock-physics models are established assuming different hydrate-filling modes for the effective medium. The model and actual velocity data for the hydrate-bearing sediments are compared and it is found that the rock-physics model for the hydrate-filling mode II well reproduces the actual data.