On Petrophysical Interrelations of Diffusion-Adsorption (Membrane) Potential with Porosity and Transport Properties
Event name: Geomodel 2019
Session: Петрофизика и ГИС
Publication date: 17 September 2019
Info: Extended abstract, PDF ( 1.19Mb )
Price: € 20
For several decades, Russia has been successfully trying to eliminate its own polarization method from quantitative interpretation of logging. There are a lot of objective reasons for this (cunning drilling muds, inaccessibility of reliable corrections in the section with differentiated resistance, low cost method, lack of petrophysical substantiation). As a result, it is often proposed to use relationships (diffusion-adsorption activity) with either porosity, now with clay content, then with bound water content. At the same time, the varied variants of the theoretical substantiation of the method that pretend to seriousness usually associate indications with the ratio of clay content (specific surface) of rocks to their porosity or with the ratio of the conductivities of the clay and sand components. The author saw his task in collecting the most plausible relationships for assessing the relationship with other physical properties and in assessing the significance of a parameter when building petrophysical relationships. F=(1 + (Ada/Ada,sh)*(rsh/Rw-1))/(PHI^m) Statistical data processing using the Ephroimson method made it possible to choose the best regression equation. The simplest equation of communication (sample length is 470 lines, and coefficient of determinism = 0.85) has the form: LgKpr = 2.16 + 0.132 * PHI - 3.18 * Lg Ада (3) Thus, the parameter LgАда actually differentiates the connection between the PHI and the Kperm according to different hydraulic units. At the same time, further increasing the number and type of regressors does not lead to a significant increase in the coefficient of determination.