基于岩石物理敏感参数的神狐海域天然气水合物饱和度估算

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摘要基于纵波速度和电阻率资料的声学、电学方法是评价水合物饱和度的基本方法。本文将与天然气水合物储集层物性特征直接相关的岩石物理参数用于评估水合物饱和度。首先基于等效介质岩石物理模型、测井交会图以及岩石物理参数反演结果，分析了5种岩石物理参数对水合物饱和度的敏感程度。然后采用模拟退火全局优化方法获取神狐海域水合物饱和度剖面。与岩石弹性模量（体积模量和剪切模量）有关的岩石物理参数Vp，λρ和λμ对水合物饱和度敏感度较高，水合物饱和度估算范围为0.1-0.44。该结果与基于原始测井曲线的饱和度范围基本一致。然而，由仅与岩石的剪切模量相关的参数Vs和μρ估算所得的水合物饱和度值相对较高：0.22-0.43，其与实际数据偏差较大。在各岩石物理参数中，泊松比（σ）对水合物饱和度评价结果最不理想。此外，水合物饱和度的敏感性取决于岩石物理模型以及水合物的储集形式。

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Abstract： 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.

Key words： natural gas hydrate saturation sensitive parameters petrophysical properties

收稿日期: 2017-11-15; 出版日期: 2020-04-03

基金资助:

本研究由（编号：2017YFC0307401，KY10500180118，41304096）资助。

通讯作者: 邢磊(Email: xingleiouc@ouc.edu.cn). 秦志亮(Email: qin_zhiliang@126.com) E-mail: xingleiouc@ouc.edu.cn;qin_zhiliang@126.com

作者简介: 刘雪芹，女，中国海洋大学博士研究生，导师：刘怀山教授；主要研究方向：地震数据处理与解释，以及天然气水合物的属性研究；邮箱：liuxq@hrbeu.edu.cn 邢磊，男，博士，中国海洋大学副教授；主要研究方向：地震数据处理与解释；邮箱：xingleiouc@ouc.edu.cn 秦志亮，男，博士，哈尔滨工程大学教授；主要研究方向：海洋应急技术、海底边界层探测、岛礁战场环境信息保障；邮箱：qin_zhiliang@126.com

引用本文:

. 基于岩石物理敏感参数的神狐海域天然气水合物饱和度估算[J]. 应用地球物理, 2018, 15(3-4（2）): 571-581.

. Sensitivity Analysis of Petrophysical Parameters for Estimating Hydrate Saturation in the Shenhu Area*[J]. APPLIED GEOPHYSICS, 2018, 15(3-4（2）): 571-581.