Irina Bayuk - Academia.edu (original) (raw)
Papers by Irina Bayuk
Journal of Marine Science and Engineering
The paper discusses the problem of localizing zones of high pore pressure in sub-bottom sediments... more The paper discusses the problem of localizing zones of high pore pressure in sub-bottom sediments (first tens of meters under the seafloor). Prediction of the overpressure zones in the near-surface is required for the mitigation of risks at the early stages of the offshore hydrocarbon field exploration and development. The results of seismic data interpretation generally serve as the main source of information for this kind of problems, yet there are other methods to predict overpressure zones in the subsurface. The paper presents the results of the overpressure zone prediction using a set of methods including empirical ones, and the approach based on rock-physics modeling that features the soft-sand model of unconsolidated media effective properties. While the rock-physics modeling grants the most reliable result, it is also the most demanding method to the input data. Hence, it can be used to verify other methods of the overpressure zone prediction. We present the results of the o...
FIELD: measuring equipment. SUBSTANCE: for determining the characteristics of pore volume and the... more FIELD: measuring equipment. SUBSTANCE: for determining the characteristics of pore volume and thermal conductivity of matrix of samples of porous materials, the sample of porous material is alternately saturated with at least two fluids with different known thermal conductivity. As at least one saturating fluid a mixture of fluids from at least two fluids with different known thermal conductivity is used. After each saturation of the sample the thermal conductivity of the saturated sample of the porous material is measured, and the characteristics of pore volume and thermal conductivity of the matrix of the sample of porous material is determined taking into account the results of thermal conductivity measurements. EFFECT: increased accuracy and stability of determining the characteristics of the pore volume and the thermal conductivity of the test samples. 14 cl, 2 dwg
Applied Sciences, 2022
The study is focused on the problem of using geophysical data to estimate brittleness of rock mas... more The study is focused on the problem of using geophysical data to estimate brittleness of rock masses for the needs of petroleum industry. Three main developed ways to estimate brittleness—mineral-based, log-based, and elastic-based brittleness indices—are discussed from the perspective of scaling factor. The study highlights the contradictions between brittleness indices calculated from the same data using various ways of introducing brittleness. These contradictions are explained by scaling factor, as geophysical data used for brittleness estimation are typically obtained at different spatial and temporal scales. A model based on the effective medium theory is used to understand the relationships between inner structure of inhomogeneous rocks and their brittleness indices estimated from laboratory tests on core samples as well as log data analysis.
Journal of Geophysical Research, 2003
The elastic properties of rocks are influenced by several microstructural variables, including th... more The elastic properties of rocks are influenced by several microstructural variables, including the lattice preferred orientation and grain shape fabric of the mineral phases, variations in the spatial distribution of the mineral phases, the properties of the grain boundaries, and the ...
SPE Russian Petroleum Technology Conference, 2017
The study is devoted to preparing data for three- and four-dimensional geomechanical modeling. Th... more The study is devoted to preparing data for three- and four-dimensional geomechanical modeling. The main focus remains on the problem of predicting the physical and mechanical properties of the medium at the scale of the reservoir based on the logging data and laboratory studies. The predicted properties are further used to prepare a three-dimensional geomechanical model of the reservoir. The model is complemented by the boundary conditions for solving the poroelastisity problem formulated in terms of stresses. The question of obtaining these boundary conditions remains a distinctive point of investigation. The main approaches of estimating in-situ stress state from logging data are considered with further choice of the method of reconstructing stresses from special well-logging techniques’ data. The stress profiles are reconstructed for the wells added to the geomechanical model.
7th EAGE Saint Petersburg International Conference and Exhibition, 2016
Geomechanical modeling is of great importance for different tasks of prospecting geophysics. This... more Geomechanical modeling is of great importance for different tasks of prospecting geophysics. This modeling requires knowledge on geomechanical characteristics including the static moduli (Young modulus and Poisson coefficient), the uniaxial compression strength and internal friction angle. The only way to get reliable geomechanical parameters is laboratory tests providing “stress-strain” curves. However, this way is time consuming and should be performed for many representative samples of all stratigraphic units penetrated by a well. Many empirical relations exist that allow one to relate the dynamic moduli provided by logging with the geomechanical parameters. However these relations work only locally. In this work we propose an approach based on classification of rocks with respect to their macrostructure controlling the both dynamic moduli and geomechanical characteristics. The microstructure is described by the rock’s model parameters inverted from the experimental data with the help of the Rock Physics modeling. This makes it possible to group different rocks into classes with respect to the model parameters. As a result this allows one to find relations between the dynamic elastic parameters measured in field and geomechanical and other physical parameters (not measured) for different rock groups via the rock microstructure parameters specific of each rock group.
This paper demonstrates new possibilities provided by a combination of effective medium theory (E... more This paper demonstrates new possibilities provided by a combination of effective medium theory (EMT) with laboratory experiment on thermal properties of porouscracked rocks. Such a combination can solve many actual problems in petrophysics and prospecting geophysics including EMT-based inversion of pore/crack geometry and thermal conductivity (TC) of mineral matrix from TC measurements on samples saturated with different fluids. The inverted geometry is used for EMT-based prediction of the other physical properties (elastic wave velocities and coefficient of linear thermal expansion). The opposite procedure is also applied — TC prediction from measurements of elastic wave velocities and electrical resistivity. An example is presented of reconstructing the TC distribution along a well from sonic, density, and porosity logs. The theoretical modeling is shown to be a useful tool in solving the ‘oil-in-place’ problem from measurements on density, volumetric heat capacity, and porosity. ...
Seismic Instruments
The article presents a complex of laboratory core analyses conducted at the Center for Petrophysi... more The article presents a complex of laboratory core analyses conducted at the Center for Petrophysical and Geomechanical Research, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences (CPGR IPE RAS). The complex provides for multiscale studies of the elastic properties, microstructure, composition, and porosity and permeability properties of rocks. The laboratory studies determine the dynamic and static elastic moduli, rock strength and creep parameters, and acoustic emission characteristics; 2D and 3D microstructure analysis is also performed. Dynamic elastic moduli are determined both under normal and reservoir-simulating conditions. Under normal conditions, multilevel ultrasound examination of samples is carried out; its results, together with those of microstructure analysis, are then used to determine the degree of inhomogeneity of the elastic properties of a sample, to reveal the anisotropy of these properties, and to compare the elastic properties of rocks at different scales. The results of geomechanical rock tests are necessary for constructing geomechanical models of reservoirs. The elastic parameters determined under normal and reservoir conditions are the basis for constructing correlation dependences that allow the geomechanical properties and principal stresses under reservoir conditions to be forecasted from well log data. Data on the elastic properties and microstructure of samples are used to construct different-scale models of the elastic properties of rocks under normal and reservoir conditions using petrophysical methods; these models further serve as a basis for petroelastic modeling of hydrocarbon fields and for predicting the viscoelastic behavior of rocks.
First International Meeting for Applied Geoscience & Energy Expanded Abstracts
This paper demonstrates how analysis of elastic wave velocities can help in solving problems rela... more This paper demonstrates how analysis of elastic wave velocities can help in solving problems related to recognizing oriented fractures. We consider fractures saturated with different fluids at different scales including core, logging, and seismic scales. To solve this problem, we calculate the elastic wave velocities propagating in different directions in fractured anisotropic rocks and then, compare them with the velocities in solid matrix without fractures in order to estimate the fracture effect. For the analysis we use the three most popular methods of Rock Physics-Hudson's, Eshelby-Cheng's, and self-consistent scheme. The results obtained with different methods are compared and applicability of each method for calculating the effective properties of fractured rocks is discussed. Specifically, it is shown that the Eshelby-Cheng method cannot be applied for the low-frequency fluid substitution. A possibility to recognize oriented fractures and estimate their orientation using cross-plots of seismic attributes is demonstrated.
Physics of the Earth and Planetary Interiors, 1999
In thermodynamic equilibrium, a fluid forms isolated inclusions in the grain corners, because of ... more In thermodynamic equilibrium, a fluid forms isolated inclusions in the grain corners, because of a low wettability of rocks. The influence of the isolated fluid inclusions on the physical properties of rocks at small fluid concentrations typical of the deep horizons of the crust must be small. However, there is a clear evidence of the considerable effect of the fluid component on the physical properties of rocks. Such an inconsistency may be explained assuming that, in some zones of the Ž. crust, the fluid phase is in a nonequilibrium state at least occasionally with a hierarchic interconnected microcrack structure. In order to model the macroscopic elastic properties and the electric conductivity of rocks with the various pore Ž. structures, we use the general singular approximation method GSA , combined with a procedure of the sequential addition of cracks. This paper is concerned with the method and results of modeling, which confirm the aforesaid suggestion on the medium structure in equilibrium and nonequilibrium state. The observed anomalies in elastic properties and electric conductivity of lower crust are explained on the basis on the numerical results.
SEG Technical Program Expanded Abstracts 2020
Geophysical Journal International
SEG Technical Program Expanded Abstracts 2018
SEG Technical Program Expanded Abstracts 2018
SPE Russian Petroleum Technology Conference
SEG Technical Program Expanded Abstracts 2017
SEG Technical Program Expanded Abstracts 2017
SEG Technical Program Expanded Abstracts 2016, 2016
Journal of Marine Science and Engineering
The paper discusses the problem of localizing zones of high pore pressure in sub-bottom sediments... more The paper discusses the problem of localizing zones of high pore pressure in sub-bottom sediments (first tens of meters under the seafloor). Prediction of the overpressure zones in the near-surface is required for the mitigation of risks at the early stages of the offshore hydrocarbon field exploration and development. The results of seismic data interpretation generally serve as the main source of information for this kind of problems, yet there are other methods to predict overpressure zones in the subsurface. The paper presents the results of the overpressure zone prediction using a set of methods including empirical ones, and the approach based on rock-physics modeling that features the soft-sand model of unconsolidated media effective properties. While the rock-physics modeling grants the most reliable result, it is also the most demanding method to the input data. Hence, it can be used to verify other methods of the overpressure zone prediction. We present the results of the o...
FIELD: measuring equipment. SUBSTANCE: for determining the characteristics of pore volume and the... more FIELD: measuring equipment. SUBSTANCE: for determining the characteristics of pore volume and thermal conductivity of matrix of samples of porous materials, the sample of porous material is alternately saturated with at least two fluids with different known thermal conductivity. As at least one saturating fluid a mixture of fluids from at least two fluids with different known thermal conductivity is used. After each saturation of the sample the thermal conductivity of the saturated sample of the porous material is measured, and the characteristics of pore volume and thermal conductivity of the matrix of the sample of porous material is determined taking into account the results of thermal conductivity measurements. EFFECT: increased accuracy and stability of determining the characteristics of the pore volume and the thermal conductivity of the test samples. 14 cl, 2 dwg
Applied Sciences, 2022
The study is focused on the problem of using geophysical data to estimate brittleness of rock mas... more The study is focused on the problem of using geophysical data to estimate brittleness of rock masses for the needs of petroleum industry. Three main developed ways to estimate brittleness—mineral-based, log-based, and elastic-based brittleness indices—are discussed from the perspective of scaling factor. The study highlights the contradictions between brittleness indices calculated from the same data using various ways of introducing brittleness. These contradictions are explained by scaling factor, as geophysical data used for brittleness estimation are typically obtained at different spatial and temporal scales. A model based on the effective medium theory is used to understand the relationships between inner structure of inhomogeneous rocks and their brittleness indices estimated from laboratory tests on core samples as well as log data analysis.
Journal of Geophysical Research, 2003
The elastic properties of rocks are influenced by several microstructural variables, including th... more The elastic properties of rocks are influenced by several microstructural variables, including the lattice preferred orientation and grain shape fabric of the mineral phases, variations in the spatial distribution of the mineral phases, the properties of the grain boundaries, and the ...
SPE Russian Petroleum Technology Conference, 2017
The study is devoted to preparing data for three- and four-dimensional geomechanical modeling. Th... more The study is devoted to preparing data for three- and four-dimensional geomechanical modeling. The main focus remains on the problem of predicting the physical and mechanical properties of the medium at the scale of the reservoir based on the logging data and laboratory studies. The predicted properties are further used to prepare a three-dimensional geomechanical model of the reservoir. The model is complemented by the boundary conditions for solving the poroelastisity problem formulated in terms of stresses. The question of obtaining these boundary conditions remains a distinctive point of investigation. The main approaches of estimating in-situ stress state from logging data are considered with further choice of the method of reconstructing stresses from special well-logging techniques’ data. The stress profiles are reconstructed for the wells added to the geomechanical model.
7th EAGE Saint Petersburg International Conference and Exhibition, 2016
Geomechanical modeling is of great importance for different tasks of prospecting geophysics. This... more Geomechanical modeling is of great importance for different tasks of prospecting geophysics. This modeling requires knowledge on geomechanical characteristics including the static moduli (Young modulus and Poisson coefficient), the uniaxial compression strength and internal friction angle. The only way to get reliable geomechanical parameters is laboratory tests providing “stress-strain” curves. However, this way is time consuming and should be performed for many representative samples of all stratigraphic units penetrated by a well. Many empirical relations exist that allow one to relate the dynamic moduli provided by logging with the geomechanical parameters. However these relations work only locally. In this work we propose an approach based on classification of rocks with respect to their macrostructure controlling the both dynamic moduli and geomechanical characteristics. The microstructure is described by the rock’s model parameters inverted from the experimental data with the help of the Rock Physics modeling. This makes it possible to group different rocks into classes with respect to the model parameters. As a result this allows one to find relations between the dynamic elastic parameters measured in field and geomechanical and other physical parameters (not measured) for different rock groups via the rock microstructure parameters specific of each rock group.
This paper demonstrates new possibilities provided by a combination of effective medium theory (E... more This paper demonstrates new possibilities provided by a combination of effective medium theory (EMT) with laboratory experiment on thermal properties of porouscracked rocks. Such a combination can solve many actual problems in petrophysics and prospecting geophysics including EMT-based inversion of pore/crack geometry and thermal conductivity (TC) of mineral matrix from TC measurements on samples saturated with different fluids. The inverted geometry is used for EMT-based prediction of the other physical properties (elastic wave velocities and coefficient of linear thermal expansion). The opposite procedure is also applied — TC prediction from measurements of elastic wave velocities and electrical resistivity. An example is presented of reconstructing the TC distribution along a well from sonic, density, and porosity logs. The theoretical modeling is shown to be a useful tool in solving the ‘oil-in-place’ problem from measurements on density, volumetric heat capacity, and porosity. ...
Seismic Instruments
The article presents a complex of laboratory core analyses conducted at the Center for Petrophysi... more The article presents a complex of laboratory core analyses conducted at the Center for Petrophysical and Geomechanical Research, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences (CPGR IPE RAS). The complex provides for multiscale studies of the elastic properties, microstructure, composition, and porosity and permeability properties of rocks. The laboratory studies determine the dynamic and static elastic moduli, rock strength and creep parameters, and acoustic emission characteristics; 2D and 3D microstructure analysis is also performed. Dynamic elastic moduli are determined both under normal and reservoir-simulating conditions. Under normal conditions, multilevel ultrasound examination of samples is carried out; its results, together with those of microstructure analysis, are then used to determine the degree of inhomogeneity of the elastic properties of a sample, to reveal the anisotropy of these properties, and to compare the elastic properties of rocks at different scales. The results of geomechanical rock tests are necessary for constructing geomechanical models of reservoirs. The elastic parameters determined under normal and reservoir conditions are the basis for constructing correlation dependences that allow the geomechanical properties and principal stresses under reservoir conditions to be forecasted from well log data. Data on the elastic properties and microstructure of samples are used to construct different-scale models of the elastic properties of rocks under normal and reservoir conditions using petrophysical methods; these models further serve as a basis for petroelastic modeling of hydrocarbon fields and for predicting the viscoelastic behavior of rocks.
First International Meeting for Applied Geoscience & Energy Expanded Abstracts
This paper demonstrates how analysis of elastic wave velocities can help in solving problems rela... more This paper demonstrates how analysis of elastic wave velocities can help in solving problems related to recognizing oriented fractures. We consider fractures saturated with different fluids at different scales including core, logging, and seismic scales. To solve this problem, we calculate the elastic wave velocities propagating in different directions in fractured anisotropic rocks and then, compare them with the velocities in solid matrix without fractures in order to estimate the fracture effect. For the analysis we use the three most popular methods of Rock Physics-Hudson's, Eshelby-Cheng's, and self-consistent scheme. The results obtained with different methods are compared and applicability of each method for calculating the effective properties of fractured rocks is discussed. Specifically, it is shown that the Eshelby-Cheng method cannot be applied for the low-frequency fluid substitution. A possibility to recognize oriented fractures and estimate their orientation using cross-plots of seismic attributes is demonstrated.
Physics of the Earth and Planetary Interiors, 1999
In thermodynamic equilibrium, a fluid forms isolated inclusions in the grain corners, because of ... more In thermodynamic equilibrium, a fluid forms isolated inclusions in the grain corners, because of a low wettability of rocks. The influence of the isolated fluid inclusions on the physical properties of rocks at small fluid concentrations typical of the deep horizons of the crust must be small. However, there is a clear evidence of the considerable effect of the fluid component on the physical properties of rocks. Such an inconsistency may be explained assuming that, in some zones of the Ž. crust, the fluid phase is in a nonequilibrium state at least occasionally with a hierarchic interconnected microcrack structure. In order to model the macroscopic elastic properties and the electric conductivity of rocks with the various pore Ž. structures, we use the general singular approximation method GSA , combined with a procedure of the sequential addition of cracks. This paper is concerned with the method and results of modeling, which confirm the aforesaid suggestion on the medium structure in equilibrium and nonequilibrium state. The observed anomalies in elastic properties and electric conductivity of lower crust are explained on the basis on the numerical results.
SEG Technical Program Expanded Abstracts 2020
Geophysical Journal International
SEG Technical Program Expanded Abstracts 2018
SEG Technical Program Expanded Abstracts 2018
SPE Russian Petroleum Technology Conference
SEG Technical Program Expanded Abstracts 2017
SEG Technical Program Expanded Abstracts 2017
SEG Technical Program Expanded Abstracts 2016, 2016