THE EFFECT OF MONTMORILLONITE CONTENT IN THE CLAYEY CEMENT OF CENOMANIAN SEDIMENTS ON A PRODUCTION WATERING FORECAST
The clayey cement composition of Cenomanian sediments in Bolshekhetskaya depression has been analyzed. It has been shown that montmorillonite leads to substantial changes in the dependencies of electrical resistivity on porosity and water saturation. It is caused by a greater pore-channel tortuosity and thicker bound-water film. Filtration models and a productive-formation saturation one have been compared (with and without correction for the content of swelling minerals in the clayey cement). The targeted use of the petrophysical relationships would provide the convergence of the actual data with the production-watering forecast.