Acoustic and electrical methods are commonly used to evaluate hydrate saturation based on the P-wave velocity and resistivity, respectively. In this paper, petrophysical parameters, which are directly related to the presence of hydrates, are used to evaluate hydrate saturation. First, five petrophysical parameters sensitive to hydrate saturation are analyzed using the equivalent medium rock physical model (MBGL), logging intersection plots and petrophysical parameter inversion. Then, the simulated annealing global optimization method is used to estimate the hydrate saturation profile in the Shenhu area. The petrophysical parameters Vp, λρ and λμ, which are associated with the rock modulus (both the elastic modulus and shear modulus), are highly sensitive to hydrate saturation, with an estimated saturation range of 0.1-0.44. This range is highly consistent with that based on the original well diameter curves. However, the parameters Vs and μρ, which are only related to the shear modulus of the rock, yield high hydrate saturation estimates of 0.22-0.43 and exhibit some deviations from real data. Due to its sensitivity, Poisson's ratio (σ) is least desirable for hydrate evaluation among the studied parameters. The sensitivity of hydrate saturation depends on the petrophysical model used in studies of the physical properties of hydrate and analyses of hydrate storage.

通常使用声学和电学方法分别基于P波速度和电阻率评估水合物饱和度。在本文中，与水合物的存在直接相关的岩石物理参数用于评估水合物的饱和度。首先，使用等效介质岩石物理模型（MBGL），测井相交图和岩石物理参数反演，分析了对水合物饱和度敏感的五个岩石物理参数。然后，使用模拟退火全局优化方法估算神湖地区的水合物饱和度曲线。与岩石模量（弹性模量和剪切模量）相关的岩石物理参数Vp，λρ和λμ对水合物饱和度高度敏感，估计饱和度范围为0.1-0.44。该范围与基于原始井径曲线的范围高度一致。但是，仅与岩石的剪切模量相关的参数Vs和μρ会产生0.22-0.43的高水合物饱和度估计值，并且与实际数据有些偏差。由于其敏感性，泊松比（σ）在所研究的参数中最不希望用于水合物评估。水合物饱和度的敏感性取决于用于研究水合物物理性质和分析水合物存储的岩石物理模型。在研究的参数中，S比（σ）对于水合物评估是最不希望的。水合物饱和度的敏感性取决于用于研究水合物物理性质和分析水合物存储的岩石物理模型。在研究的参数中，S比（σ）对于水合物评估而言是最不希望的。水合物饱和度的敏感性取决于用于研究水合物物理性质和分析水合物存储的岩石物理模型。