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根据岩石物理的分析方法,针对青藏高原木里地区DK1井孔143.40~144.20m含水合物层段和DK4井孔165.80~166.35m含水合物层段,分析水合物在岩层孔隙中的填充模式。首先采用时间平均公式估算含水合物粉砂岩的物性参数,然后依据弹性模量模型方法构建岩石物理模型,其中模式一是将水合物看作孔隙充填物的一部分,模式二是将水合物看作岩石骨架的一部分,分别基于不同的模式计算含水合物岩层的纵波速度和横波速度,并比较2种模式的速度差异。最后通过理论计算的曲线与实际采样点数据对比,推测该地区岩层中水合物的填充赋存方式符合模式二,认为将该层段水合物作为骨架的一部分进行分析,更能反映真实含水合物地层的物性特征。
According to the petrophysical analysis method, the hydrate reservoir interval of 143.40 ~ 144.20m in DK1 well bore and DK5 well of 16.580 ~ 166.35m in DK4 wellbore of Muli, Qinghai-Tibet Plateau are analyzed, and the filling mode of hydrate in pore of rock is analyzed. First, the time-averaged formula is used to estimate the physical parameters of the hydrate-bearing siltstone. Then, the petrophysical model is constructed based on the elastic modulus model. The first model considers the hydrate as part of the pore filling. The second model considers the hydrate as A part of the rock skeleton calculates the longitudinal and shear wave velocities of hydrate-bearing rock formations based on different modes, and compares the velocity differences between the two modes. Finally, by comparing the calculated curve with the actual sampling data, it is speculated that the filling pattern of hydrate in the rock strata of this area complies with the second pattern. It is considered that the hydrate in the interval is analyzed as part of the skeleton to better reflect the real hydrate Physical characteristics of strata.