A new technique for electrical rock typing and estimation of cementation factor in carbonate rocks

In this paper, Electrical Quality Index (EQI) is proposed as a new parameter for classification of F data in an attempt to improve estimation of cementation factor. Rock samples with similar EQIs have similar electrical behavior. In other words, EQI can be used to group rock samples into distinctive groups with specific equations of formation resistivity and cementation factors versus porosity. The proposed technique was applied to the 112 carbonate rock samples reported in Ragland's work. EQI divided these samples into 9 groups which have different equations of F versus porosity with high values of determination coefficients. Also, cementation factor versus porosity plots showed linear trends with high determination coefficients for all of the EQI groups.