Research Progress on the Electrical Properties of Gas Hydrate-bearing Sediments  

作　　者：TAN Kui ZHANG Qi HE Tao 

机构地区：[1]Key Laboratory of Orogenic Belts and Crustal Evolution(Ministry of Education),School of Earth and Space Sciences,Peking University,Beijing 100871,China [2]Beijing International Center for Gas Hydrate,Peking University,Beijing 100871,China

出　　处：《Acta Geologica Sinica(English Edition)》2023年第3期816-827,共12页地质学报（英文版）

基　　金：the financial support provided by the National Natural Science Foundation of China(Grant Nos.42174133 and 41676032);China Geological Survey(Grant No.DD20190234)。

摘　　要：Electrical properties are important physical parameters of natural gas hydrate,and,specifically,resistivity has been widely used in the quantitative estimation of hydrate saturation.There are three main methods to study the electrical properties of gas hydrate-bearing sediments:experimental laboratory measurements,numerical simulation,and resistivity logging.Experimental measurements can be divided into three categories:normal electrical measurement,complex resistivity measurement,and electrical resistivity tomography.Experimental measurements show that the resistivity of hydrate-bearing sediment is affected by many factors,and its distribution as well as the hydrate saturation is not uniform;there is a distinct non-Archie phenomenon.The numerical method can simulate the resistivity of sediments by changing the hydrate occurrence state,saturation,distribution,etc.However,it needs to be combined with X-ray CT,nuclear magnetic resonance,and other imaging techniques to characterize the porous characteristics of the hydrate-bearing sediments.Resistivity well logging can easily identify hydrate layers based on their significantly higher resistivity than the background,but the field data of the hydrate layer also has a serious non-Archie phenomenon.Therefore,more experimental measurements and numerical simulation studies are needed to correct the parameters of Archie’s formula.

关 键 词：resource exploration gas hydrate RESISTIVITY hydrate saturation numerical simulation well logging Archie's formula 

分 类 号：P744.4[天文地球—海洋科学]