KFU. Card publication. Carbonate Pore Shape Evaluation Using Digital Image Analysis, Tomography, and Effective Medium Theory

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FEDERAL UNIVERSITY

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CARBONATE PORE SHAPE EVALUATION USING DIGITAL IMAGE ANALYSIS, TOMOGRAPHY, AND EFFECTIVE MEDIUM THEORY

Form of presentation

Articles in international journals and collections

Year of publication

2023

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Authors, employees of KFU

Ziganshin Eduard Rishadovich, author

Kadyrov Rail Ilgizarovich, author

Nguen Tkhan Khyng , author

Nurgaliev Danis Karlovich, author

Other authors

Bayuk Irina Olegovna, author

Bibliographic description in the original language

Ziganshin, E.; Nourgaliev, D.; Bayuk, I.; Kadyrov, R.; Nguyen, T.H. Carbonate Pore Shape Evaluation Using Digital Image Analysis, Tomography, and Effective Medium Theory. Appl. Sci. 2023, 13, 2696. https://doi.org/10.3390/app13042696

Annotation

Carbonate rocks have a wide variety of pore shapes and different types of grains, which greatly affect the elastic properties and characteristics of the reservoir. This causes certain difficulties in petroelastic modeling. One of the problems is the scale of the input data, which is then used to build the rock physics model. The paper presents the results of studying three core samples of carbonate rocks of the Upper Devonian and Lower Carboniferous age, which are located in the South Tatar arch (Volga-Ural oil and gas basin (Russia)). To evaluate the structural characteristics of the pore space, the effective medium theory is used. The input data are the results of laboratory studies that include measurements of the velocities of longitudinal and transverse waves, porosity, and thin section and computed tomography analysis. When using the computed tomography, the core samples are analyzed at different resolution (12–37 ?m/voxel). The tomography studies of pore space at different scales provide rather different values of porosity and pore aspect ratio. The tomography-based porosity estimations also differ from the experimentally measured porosity (up to 10%). The pore space characteristics provided by different datasets are used to build a rock physics model for the studied rocks that helps to estimate the elastic wave velocities with three different methods of effective medium theory (self-consistent approximation, differential effective medium (DEM), and the Kuster–Toksöz method). A comparison of the velocity estimations with their experimental analogs for dry rocks may indicate the presence of microcracks whose size is beyond the tomography resolution. Improved rock physics models incorporating both pores and microcracks are then used to predict the elastic wave velocities of fluid-saturated rock in a wide porosity range. It is demonstrated that the predicted values significantly differ (up to 30%) from those provided by the rock physics (RP) models constructed without the support of the tomography results. Moreover, other types of models are considered in which the difference in experimental and theoretical velocities is attributed to changes in the host matrix properties as compared to the calcite polycrystal, which are caused by various reasons.

Keywords

carbonate rock; rock physics; elastic properties; pore space shape; effective medium theory

The name of the journal

Applied Sciences (Switzerland)

On-line resource for training course

http://dspace.kpfu.ru/xmlui/bitstream/handle/net/173832/F_applsci_13_02696.pdf?sequence=1&isAllowed=y

URL

https://doi.org/10.3390/app13042696

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=276796&p_lang=2

Resource files

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F_applsci_13_02696.pdf	8,93	pdf	show / download

Full metadata record

Field DC	Value	Language
dc.contributor.author	Ziganshin Eduard Rishadovich	ru_RU
dc.contributor.author	Kadyrov Rail Ilgizarovich	ru_RU
dc.contributor.author	Nguen Tkhan Khyng	ru_RU
dc.contributor.author	Nurgaliev Danis Karlovich	ru_RU
dc.contributor.author	Bayuk Irina Olegovna	ru_RU
dc.date.accessioned	2023-01-01T00:00:00Z	ru_RU
dc.date.available	2023-01-01T00:00:00Z	ru_RU
dc.date.issued	2023	ru_RU
dc.identifier.citation	Ziganshin, E.; Nourgaliev, D.; Bayuk, I.; Kadyrov, R.; Nguyen, T.H. Carbonate Pore Shape Evaluation Using Digital Image Analysis, Tomography, and Effective Medium Theory. Appl. Sci. 2023, 13, 2696. https://doi.org/10.3390/app13042696	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=276796&p_lang=2	ru_RU
dc.description.abstract	Applied Sciences (Switzerland)	ru_RU
dc.description.abstract	Carbonate rocks have a wide variety of pore shapes and different types of grains, which greatly affect the elastic properties and characteristics of the reservoir. This causes certain difficulties in petroelastic modeling. One of the problems is the scale of the input data, which is then used to build the rock physics model. The paper presents the results of studying three core samples of carbonate rocks of the Upper Devonian and Lower Carboniferous age, which are located in the South Tatar arch (Volga-Ural oil and gas basin (Russia)). To evaluate the structural characteristics of the pore space, the effective medium theory is used. The input data are the results of laboratory studies that include measurements of the velocities of longitudinal and transverse waves, porosity, and thin section and computed tomography analysis. When using the computed tomography, the core samples are analyzed at different resolution (12–37 ?m/voxel). The tomography studies of pore space at different scales provide rather different values of porosity and pore aspect ratio. The tomography-based porosity estimations also differ from the experimentally measured porosity (up to 10%). The pore space characteristics provided by different datasets are used to build a rock physics model for the studied rocks that helps to estimate the elastic wave velocities with three different methods of effective medium theory (self-consistent approximation, differential effective medium (DEM), and the Kuster–Toksöz method). A comparison of the velocity estimations with their experimental analogs for dry rocks may indicate the presence of microcracks whose size is beyond the tomography resolution. Improved rock physics models incorporating both pores and microcracks are then used to predict the elastic wave velocities of fluid-saturated rock in a wide porosity range. It is demonstrated that the predicted values significantly differ (up to 30%) from those provided by the rock physics (RP) models constructed without the support of the tomography results. Moreover, other types of models are considered in which the difference in experimental and theoretical velocities is attributed to changes in the host matrix properties as compared to the calcite polycrystal, which are caused by various reasons.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject		ru_RU
dc.title	Carbonate Pore Shape Evaluation Using Digital Image Analysis, Tomography, and Effective Medium Theory	ru_RU
dc.type	Articles in international journals and collections	ru_RU