Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

A method for initializing grain mass and maintaining dry condition of a core sample has been suggested. It is validated by effective porosity and resistivity measurements of cement core samples. Injection of noble gas such as nitrogen gas during the drying process of a core sample can ignore the environmental factors of the core beforehand and initialize the grain mass and sustain the core in dry condition for a while by keeping the pore space from infiltrating the humidity in the air. Injection of nitrogen gas into the dried cement cores effectively block or delay the humidity invasion into the pore space, so that one can get grain mass with minimum humidity in its pore space, and can perform an long term resistivity monitoring of the dry sample. Based on the suggested method and experiment results, it is suggested to modify the standard test method for effective porosity and density of rocks.