«Geology, geophysics and development of oil and gas fields»

Assessment of carbonate core permeability based on fractal analysis: a comparative approach of different models

UDC: 622.276.7
DOI: -

Authors:

¹ Empress Catherine II Saint-Petersburg Mining University, Saint Petersburg, Russia

Keywords: deposit carbonates, permeability, fractal theory, tortuosity, nuclear magnetic resonance

Annotation:

The article addresses the problem of permeability assessment in carbonate rocks, which are characterized by a complex pore structure. The aim of the study is to establish quantitative relationships between the fractal parameters of the pore space and the filtration-capacity properties of various types of carbonate core. The methodological framework is based on experimental investigations using nuclear magnetic resonance (NMR), microscopic analysis of thin sections and the application of fractal analysis. As a result, quantitative characteristics of the fractal dimension and tortuosity of pore channels were obtained for porous, cavernous and fracture-cavernous core types. It was established that an increase in the fractal dimension correlates with improved permeability and porosity of the rock. A comparative analysis of existing analytical models was carried out, confirming the effectiveness of fractal models, particularly those incorporating the fractal tortuosity index and capillary channel length. The findings validate the potential of fractal analysis for improving the accuracy of predicting filtration-capacity properties and optimizing the development of complex carbonate reservoirs.

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