关键词: 孔隙, 岩样, 电学性质, 孔隙结构, 地层因素

Abstract:

It was found that in double logarithmic coordinates,the relationship of formation factor and porosity is a second order function and no longer the linear formula proposed by Archie in 1940's.The function can be simplified as two linear formulae.They represent different electrical properties which relate to the two predominant pore structures of sandstone,netted and pseudo capillary bundle like structure.It was also concluded in the paper that the electircal characteristics should be same if the pore structure of the reservoirs is not significantly different.Both the cementation factor m and the constant a are controlled by pore structure,and they are related to each other among the various sandstone with different pore structures.The verified prediction of values of m and a showed that the porosity,permeability and their distributions can be used to characterize qualitatively the pore structure and to predict the values of m and a.The modified Archie's formation factor vs porosity formula proposed in this paper is suite for reservoirs with different pore structures of reservoirs

Key words: pore, rock sample, electrical property, pore structure, formation factor