Methane hydrates are widely distributed in the soft silty-clayey soils of continental margin sediments. The resistivity method is generally used to detect their distribution state and monitor their kinetic reaction process. However, there are some major details to be elaborated on as to the occurrence state and the evolution of key characteristic parameters. Based on the kinetic reaction experiment under different lithological conditions (initial water content and pore water salinity), this research records the changing resistance of natural sand porous medium system during the cooling formation of hydrates by in-situ measurement. The Archie formula is further used to study the influencing factors of the resistance of hydrate-bearing sediments and how the resistance changes during hydrate formation. The results demonstrate that these two lithological parameters can significantly affect the resistivity of the hydrate-bearing natural sand porous media system. It is found that within a certain range, NaCl in pore water will inhibit the formation reaction of hydrates, while an increase of initial water content will enhance the hydrate production amount in the system. With the hydrate formation in the pores, the porosity and skeleton composition of the natural sand porous medium change as well, coupled with the salt-removing effect, which further changes the system resistivity. During hydrate formation, the system resistivity changes regularly in the cooling stage, hydrate nucleation stage, and hydrate formation stage. Our study systematically considers the influence of these geological parameters on resistivity characterization at different reaction stages during the formation of natural hydrates. Thus, it can serve as a technical reference for hydrate reservoir logging and other related issues.

中文翻译：

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初始孔隙水含量和盐度对含甲烷水合物细粒沉积物电阻率的影响

甲烷水合物广泛分布于大陆边缘沉积物的软粉质粘土中。一般采用电阻率法来检测它们的分布状态并监测它们的动力学反应过程。然而，关于其发生状态和关键特征参数的演变，还有一些重大细节需要详细阐述。本研究基于不同岩性条件（初始含水量和孔隙水矿化度）下的动力学反应实验，通过原位测量记录了天然砂多孔介质体系在水合物冷却形成过程中阻力的变化。进一步利用阿尔奇公式研究了含水合物沉积物阻力的影响因素以及水合物形成过程中阻力的变化。结果表明，这两个岩性参数可以显着影响含水合物天然砂多孔介质系统的电阻率。研究发现，在一定范围内，孔隙水中的NaCl会抑制水合物的形成反应，而初始含水量的增加会增加系统中水合物的生成量。随着孔隙中水合物的形成，天然砂多孔介质的孔隙度和骨架组成也发生变化，加上脱盐作用，进一步改变了系统电阻率。水合物形成过程中，系统电阻率在冷却阶段、水合物成核阶段、水合物形成阶段有规律地变化。我们的研究系统地考虑了这些地质参数对天然水合物形成过程中不同反应阶段电阻率表征的影响。可为水合物储层测井及其他相关问题提供技术参考。