Pore Space Connectivity in Different Rock-Physics Methods—Similarity and Differences

Berezina, I.; Bayuk, I.

Авторы: Berezina Irina, Bayuk Irina
Журнал: Applied Sciences
Том: 12
Номер: 19
Год издания: 2022
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Первая страница: 1
Последняя страница: 21
Номер статьи: 10185
DOI: 10.3390/app121910185
Аннотация: This study is focused on the analysis of pore space connectivity in reservoir rocks. Thisparameter is of vital importance for the oil and gas industry since it controls hydraulic permeability.Five methods of rock physics are used for this goal. Three of these methods (self-consistent versionof generalized singular approximation, Berryman self-consistent method, and differential scheme)take into account the pore space connectivity implicitly. The other two methods, the f -model of thegeneralized singular approximation and a similar modification of the Berryman method suggested inthis work, allow for quantifying the connectivity via a special parameter (f -parameter). In order toreveal a physical meaning of this parameter, two simple models of carbonate rock (porous-crackedlimestone) are considered. The first model is a double porosity model containing spherical poresand cracks. The second model contains only spherical pores, and their connectivity is expressed viathe f -parameter. The pores and cracks are filled with brine and gas. Application of the two groupsof methods for modeling the effective elastic properties of the carbonate rock gives a possibility ofrelating the f -parameter to the characteristics of the cracks and pores. The f -parameter is shown tobe controlled by the relative crack volume in the total pore space. An increase in crack porosity andcrack density leads to an increase in the f -parameter. A good correlation of the f -parameter withcrack density is demonstrated. It is shown that for the porosity range 2–20%, a relationship betweenthe f -parameter and crack density eps, in general, has the form f = a log10 (eps)2 + b log10 (eps) + c for eps <= eps_min. For the crack density less than eps_min the f -parameter can be approximated by a constantvalue fmin. The values of eps_min and fmin and coefficients a, b, and c depend on the porosity of sphericalpores, saturation type, and pair of methods used for finding the link. These results give f -models anadvantage in searching zones of the enhanced permeability and quantifying the ability of these zonesto filtrate fluids.
Добавил в систему: Баюк Ирина Олеговна

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Pore Space Connectivity in Different Rock-Physics Methods—Similarity and Differencesстатья

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