Resistivity characteristics of natural gas hydrate-bearing sediments and the application progress of the Archie equation
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摘要: 天然气水合物饱和度的评价以阿尔奇(Archie)公式为核心、岩电参数为应用基础。针对不同的地质环境匹配相应的岩电参数值,尤其是孔隙度指数(m)和饱和度指数(n),是准确计算饱和度的关键。在电阻率测井中,如何使m、n值更适合于天然气水合物的评价仍是一个难题。为了厘清天然气水合物电阻率的相关规律和Archie公式中岩电参数值的确定方法,本文系统调研了相关文献资料,对天然气水合物的电阻率影响因素进行了总结梳理,并对如何利用Archie公式精准评价天然气水合物的饱和度进行了影响因素的分析。在此基础上,总结了天然气水合物沉积物的电阻率特性,提出了Archie公式的应用研究方向。Abstract: Studying the occurrence of natural gas hydrates (NGHs) is of profound significance for NGH exploration. The evaluation of the NGH saturation mainly relies on the Archie equation using the electrical parameters of rocks. The key to accurately calculating the NGH saturation is to select corresponding values of rock electrical parameters for different geological environments, especially the porosity index (m) and the saturation index (n). However, it is still a challenge to select the optimal m and n values for NGH evaluation in resistivity logging. To ascertain the relevant resistivity regularity of NGHs and the determination method of rock electrical parameter values in the Archie equation, this study systematically reviewed relevant references and summarized the resistivity influencing factors of NGHs. Moreover, this study analyzed the influencing factors for the accurate evaluation of the NGH saturation based on the Archie equation. Accordingly, this study generalized the resistivity characteristics of NGH-bearing sediments and proposed the application research direction of the Archie equation.
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Key words:
- natural gas hydrate /
- resistivity logging /
- Archie equation /
- rock electrical parameter /
- saturation
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