E. Pervago - Profile on Academia.edu (original) (raw)

Papers by E. Pervago

3rd EEGS Meeting, 1997

Fig.3. Curves of sounding with Darray and their transformations for two models (see details in th... more Fig.3. Curves of sounding with Darray and their transformations for two models (see details in the text)

Resistivity method, old and new

The Technology of the Joint Inversion of Conventional Well Logs for Evaluation of Double Porosity Carbonate Formations; #41942 (2016)

This work presents a new technology of well log interpretation for determining lithology, pore sy... more This work presents a new technology of well log interpretation for determining lithology, pore system characteristics, and saturations of double-porosity carbonate formations. This technology includes a unified petrophysical model for calculating the effective physical properties of carbonates and joint inversion of the following conventional logs: Pand S-wave transit times, resistivity, density, neutron porosity, gamma ray, and photoelectric absorption property. The inversion procedure consists in minimizing the cost function, which contains the sum of weighted square differences between the measured and calculated logs, and the regularization functional with additional information, initial model parameters, and ranges of their variations. The following petrophysical parameters are obtained by the inversion: a) volumes of limestone, dolomite, and shale; b) porosities of matrix, fractures, and vugs; c) connectivity of fractures and vugs; and d) initial and residual oil saturations i...

The New Approach to the Analysis of the Azimuthal Resistivity Data Over Anisotropic Media

59th EAGE Conference & Exhibition, 1997

Propagation of Elastic Compressional Waves in a Porous-Fractured Medium Saturated with Immiscible Fluids

Izvestiya, Physics of the Solid Earth, 2020

Abstract The problem of calculating the reflection and transmission coefficients of elastic P -wa... more Abstract The problem of calculating the reflection and transmission coefficients of elastic P -wave incident from a porous half-space onto a fluid-filled crack is solved. The influence of capillary effects arising at the interface between a crack and a porous matrix on these coefficients is analyzed. In the first-order (single-) scattering approximation, the wave number of the effective P -wave propagating in a porous-fractured medium is calculated. It is shown that the hydrodynamic effects associated with fluid filtration at cracks’ boundaries in the field of an acoustic wave lead to significant frequency dispersion of the effective P -wave velocity.

Distortions of VES data caused by subsurface inhomogeneities

56th EAEG Meeting, 1994

The first (mainly used) model for VES method is based on horizontally layered structure. The seco... more The first (mainly used) model for VES method is based on horizontally layered structure. The second one includes different deep objects, such as faults, horsts, grabens, domes, etc. We introduce the third model, which includes horizontal layers, deep objects, and many subsurface objects of different resistivities, referred to as subsurface inhomogeneities (SSIs).

3rd EEGS Meeting, 1997

For the control of a hvdro-geological situation on the channel Oder-Spree in Brandenburg land. Oe... more For the control of a hvdro-geological situation on the channel Oder-Spree in Brandenburg land. Oerman'' a firm Umweltanal y tik Brandenburg GmbH together with MSU developed hardware and software for aquatorial electrical surve. At construction of such instrumentation the basic problern consists in management of measuring process. The measurements on aquatona are carried oul in a movement in real time and without an opportunity to re-measure of separate readings. The software is intended for work in multitask operating systems as Windows lxx, that has caused necessztv of s nchronisation of all hardware parts in the process of measurement. The hardware complex inciudes the managing Notebook computer. AiD converter. clock generator and an analog measuring part. which inciudes a measuring cable with electrodes and amplifiers. On each site of measurement signals from 32 channels were measured during two seconds. As A/D 26 channel converter was used. switclung between groups of 16 channels was made on each site. Measurements of four AUSF values (ExL Ex2. Ex3. E). water resistivit and dipole axial sounding (DAS) on 20 spacings were maid, On each channel amplification a signal and canceling of industrial noise were made. To increase of reliabilit. the measurements ori each channel were carried Out with readings' accumulation and averaging. The instrumentation at the present provides the following operauons: Self-potential (SP) measurements of Ex component on threc channels and Ey component intended for search of water outflows and discharges. SP method is based on study filtration potentials. which are raised under action of groundwater. filtered through capillanes of rocks. Thus the water outflow through aquatona bonom causes negative SP potential. and the discharge subterranean water in the river raises positive SP anomalies: Resistivimetry (R) serves for determination of an electrical resistivity of water, which depends on its ininerahzation and can speci1 places of subterranean waters' discharge and sites of aqualorial pollution: Dipole axial sounding (DAS) is carried Out ith- .

69th EAGE Conference and Exhibition incorporating SPE EUROPEC 2007, 2007

In this paper we present an electromagnetic technology for non destructive surface inspection of ... more In this paper we present an electromagnetic technology for non destructive surface inspection of metallic pipelines that includes the determination of pipeline position and depth, assessment of technical condition of an insulation coating, and estimation of operating state of a cathodic protection system. This technology is based on the approximation of a metallic pipeline by a heterogeneous transmission line. In the model, the pipeline with damage of the insulated coating (variations of leakage resistance) and deterioration of the tube wall thickness (changes of tube impedance) is represented by uniform transmission line segments (piecewise model). This approach reduces the problem dimensions to 1D and allows us to obtain the analytical solution for calculating the voltage, current, and magnetic field distributions for single and group interconnected pipelines. Using the transmission line model we have simulated the voltage and current distributions for two interconnected pipelines with variable insulated coating in the low frequency range. The field operations consist in measurements of (1) the magnetic field created by the current flowing in a pipeline, (2) voltages on the control posts of cathodic protection, and (3) soil resistivity. We present the example of this technology application for the practical inspection of group interconnected oil pipelines.

Metal, Ceramic and Polymeric Composites for Various Uses, 2011

Rational investor hypothesis, efficient markets hypothesis(EMH), and random walk of yield rate ar... more Rational investor hypothesis, efficient markets hypothesis(EMH), and random walk of yield rate are three basic concepts of modern capital market theory. However, it could not be proved that real capital markets are full with rational investors. The theory, which regards the price movement of capital market as random walks, and regards the yield time series as a normal distribution, is not supported by the real statistics data usually. A capital market, in essence, could be regarded as a complex system, which consists of masses of investors. Investors make investment decision basing on the public or private information inside or outside the market. The movement of price and volume is the emergency of investors' group behavior. With the sustained growth of computational capabilities and the appearance of complexity science, artificial life, multi-agent system (MAS), and cellular automata (CA) are provided for the modeling of complex system. Researchers got powerful tools to build discrete dynamics model for the capital market for the first time. The Santa Fe artificial stock market(SF-ASM), which is presented by Santa Fe institution in 1970s, is the original version of the artificial financial market(AFM). Modeling for the microstructure of the capital market, made the verification and falsification of economics theories possible. On the part of macroscopic statistical data of the market, a series non-linear dynamic analysis method, such as fractal statistics, had been applied to analysis of financial time series. New research methods, which are used both in microscopic and macroscopic aspects of capital market, help us build brand new dynamic models for capital markets. The appearance of SF-ASM has influenced this area deeply. Most successors are the variety or improvement of SF-ASM. SF-ASM is a kind of MAS, which focuses on simulating heterogeneous investors' investment behaviours. In my opinion, the investment process of an investor can be divided into 2 steps: forecasting and decision. The forecasting step is how an investor considers public or private information inside or outside of the market. And the decision step is how an investor reacts to the prediction. Rational investor hypothesis and various investment decision processes in SF-ASM are just different ways to deal with information. Basing on neoclassicism economics, EMH announce that the price in the market reflects all information, or at least all public information, and that rational investors react to these information in the same way. Multi-Agent based SF-ASM supports heterogeneous investors in reacting to information in various ways, but provides public price as the only information. The fact that information relating to the market is homogeneous and public to each investor can be compared to the gas filling the whole www.intechopen.com Cellular Automata -Simplicity Behind Complexity 360 " c o n t a i n e r o f m a r k e t " . H o w e v e r , a s w e k n o w , i n r e a l c a p i t a l m a r k e t s , e x c e p t p u b l i c information including the announcement, annual report, interest rate etc., there are also inside information, individual attitudes or predictions, and even emotions, which can influence investors' investment. What's more, information is time sensitive. Because nonpublic information may reach investors in different time, the situation of real capital market could be more complex. So SF-ASM is more "efficient" than real capital markets for it's simplifying the description of information. If we describe the non-public information in an AFM model, the interoperation among individual investors can be expressed certainly. As a result, the cellular automaton (CA) is adopted. Classical CA is a kind of large scale discrete dynamical systems. Each cell in CA can interoperate with neighbors in a local scope, which is defined by CA's neighborhood. Yiming Wei, Shang-jun Ying, Ying Fan, and Bing-Hong Wang presented a CA based AFM in 2003. In this model, the local interoperation of CA is used to describe the spread of the herd behavior in capital markets. However, the neighborhood of this CA based AFM is still classical Moore neighborhood. All the investors in this AFM have the same simple investment behavior rule. The pricing mechanism of the market is far from the realistic markets. In real capital markets, as we know, the non-public information spreads through the investors' social network, rather than 2-D lattice. The connectivity, diameter, and degree distribution of the social network can decide the speed and scope of the information spreading. Furthermore, social network is not a fix, but dynamic structure. According to the above reasons, combining the feature of multi-agent system and complex network, we extend the definition of CA in following aspects in this chapter: Neighborhood with network topology is adopted in CA; Structure of neighborhood is no more fixed, and will change following the neighborhood evolution rule; Cells in CA are no more homogeneous, and each cell has its own state transfer function with the same interoperation interface. Combining the above extensions of CA, as well as the other researchers' research on cellular automata on networks (or graph automata), we present a formal definition of CA on networks. On the basis of CA on networks, a new artificial financial market modeling framework, Emergency-AFM (E-AFM), is introduced in this chapter. E-AFM provides all standard interfaces and full functional components of AFM modeling. It includes classification and expression of information, uniform interfaces for investors' prediction and decision process, uniform interface for pricing mechanism, and analysis tools for time series. E-AFM is a modeling framework for any kind of AFM. By instantiating the investors' asset structure, neighborhood network, behavior rules of investors, and pricing mechanism, we can get a specific AFM model. After an AFM model is simulated, we can get a price and volume time series in standard format just like real capital markets. Analysis tools provided by E-AFM, such as Hurst exponent and Lyapunov exponent, can be used to measure the fluctuation feature of price/yield time series. We can compare the simulation data with the real capital market data. Also we can find the relationship between the fluctuation feature and the topology of social networks. In the rest of this chapter, an E-AFM based AFM model is introduced. This model is a simple model which is designed to find the relationship between the fluctuation feature of price time series and the degree distribution of the social network (neighborhood of CA). The statistics feature of neighbourhood structure is observed and compared with the fluctuation feature of price/yield time series. It is not a perfect model to get a new capital theory, but we can still realize how cellular automata can help us to do research in financial area.

Study of Working and Projected Pipelines with Electrical Methods

60th EAGE Conference and Exhibition, 1998

Pipelines are the systems of life-support of a modern society. In pipes oil and gas, tap and tech... more Pipelines are the systems of life-support of a modern society. In pipes oil and gas, tap and technical water, water for heating are supplied; household and industrial sewage are removed. The large part of pipes is dipped in ground.

5th EEGS-ES Meeting, 1999

The stream function described is employed for the presentation of 2D DC modeling results. The 2D ... more The stream function described is employed for the presentation of 2D DC modeling results. The 2D model is understood as a 2D medium with linear current electrodes, oriented along the inhomogeneities' strike direction. In this case both the medium and the electric field depend on two space coordinates only. Modeling becomes much easier than considering point current electrodes, where the electrical field always is three-dimensional. Meanwhile the actual results of such modeling are qualitatively equivalent to 3D modeling with point electrodes, as long as the measurements are conducted across the objects. The classical modeling presentation is in apparent resistivity which reflects an electric field distribution on the earth's surface. Quite often the connection of measured anomalies with a geoelectrical model is rather complex (fig. 1, A and C). The visualization of DC current lines simplifies understanding of the electric field's structure. Current lines are used in almost each textbook, but a practical technique for their construction is usually not included. The evident way for drawing current-lines is the step by step continuation of a line from some point along the electric field direction. The practical realization of such approach is not trivial. For a 2D field it is possible to use the stream-function. This function is often used in EM field modeling [flux function, Berdichevsky, 1984]. A contour map of the streamfunction corresponds to the streamline distribution. Thus the problem of current streamlines' construction is reduced to the calculation of the streamfunction in the research area. This can be achieved by calculating secondary surface charges, which are determined at 2D modeling, using Fredholm's integral equation of the second type relatively of electric field [Escola, 1979].

4th EEGS Meeting, 1998

Anisotropy of rocks' resistivity is a weak enough phenomenon in comparison with inhomogeneity inf... more Anisotropy of rocks' resistivity is a weak enough phenomenon in comparison with inhomogeneity influence. That is why we are trying to find an array being the most sensitive to anisotropy and to develop field survey and data processing technology for anisotropy and inhomogeneity influence estimation and separation. New step in this study gives arrow-type array. Fig.1. Spectra of arrays. Curves are marked with angle θ value.

Interpretation of Resistivity Sounding Data - Distorted by Geological Noise

61st EAGE Conference and Exhibition, 1999

The traditional resistivity sounding method deals with isolated sounding sites located casually o... more The traditional resistivity sounding method deals with isolated sounding sites located casually on profile or area and executed with logarithmic step in distante growth. This technology has very restricted possibilities.

Anisotropy Effects Investigations by Resistivity Method in Some Inhomogeneous Media

57th EAEG Meeting, 1995

Resistivity method is usually applied for horizontally-layered media investigation as sounding, a... more Resistivity method is usually applied for horizontally-layered media investigation as sounding, and for inhomogeneous media as profiling.

Transport in Porous Media, 2009

Motivated by recent numerical results, we study the quantum phase transitions between Z2 spin liq... more Motivated by recent numerical results, we study the quantum phase transitions between Z2 spin liquid, Néel ordered, and various valence bond solid (VBS) states on the honeycomb and square lattices, with emphasis on the staggered VBS. In contrast to the well-understood columnar VBS order, the staggered VBS is not described by an XY order parameter with ZN anisotropy close to these quantum phase transitions. Instead, we demonstrate that on the honeycomb lattice, the staggered VBS is more appropriately described as an O(3) or CP(2) order parameter with cubic anisotropy, while on the square lattice it is described by an O(4) or CP(3) order parameter.

Journal of Petroleum Science and Engineering, 2007

In this paper we propose a new approach of well log data interpretation for determining lithologi... more In this paper we propose a new approach of well log data interpretation for determining lithological and petrophysical characteristics of double-porosity carbonate formations containing shales. This approach is based on the theoretical calculation of rock physical properties and joint simultaneous inversion of the following conventional logs: P-and S-wave transit times, resistivity, density, neutron porosity, and gamma ray. The inversion procedure consists in minimizing a cost function that includes the sum of weighted square differences between the measured and calculated logs, and the regularization functional containing additional information (initial model parameters and ranges of their variations). The petrophysical parameters determined by the inversion are a shale volume, dolomite volume, matrix porosity, secondary porosity and secondary porosity type (aspect ratios of spheroids approximating secondary pores). To calculate the theoretical logs we use the formation model that corresponds to a transversely isotropic medium composed of intercalated layers of carbonates with secondary porosity of different types and shales. The carbonate rocks are treated as a composite material that consists of a homogeneous isotropic matrix (solid skeleton and matrix pore system) where the secondary pores represented by spheroids are embedded. The matrix physical properties are calculated taking into account the mineral composition of solid components. For computing the effective properties we apply the symmetrical self-consistent method of the effective medium approximation. The shale properties as well mineral and fluid characteristics can be considered as known and they are adjusted by the posterior analysis of error distributions for each log. The results of joint inversion obtained for various boreholes from vuggy and fractured carbonate reservoirs of the South Zone of Mexico show a good correspondence with core data, image log, and geological descriptions. Based on the experimental data we demonstrate that the output inversion parameters can be used to improve the classification of carbonate lithotypes and assessment of the secondary pore interconnections required for the permeability prediction.

Simulation of the Electrical Resistivity of Dual-Porosity Carbonate Formations Saturated with Fluid Mixtures

Preview Determination of the water saturation is the crucial point in formation evaluation. For t... more Preview Determination of the water saturation is the crucial point in formation evaluation. For this purpose the well log data are widely used. Traditional estimation of the water saturation from the resistivity logs uses models described by Archie? s law. These models consider ...

Simulation of the Electrical Resistivity of Dual-Porosity Carbonate Formations Saturated with Fluid Mixtures

Preview Determination of the water saturation is the crucial point in formation evaluation. For t... more Preview Determination of the water saturation is the crucial point in formation evaluation. For this purpose the well log data are widely used. Traditional estimation of the water saturation from the resistivity logs uses models described by Archie? s law. These models consider ...

3rd EEGS Meeting, 1997

Fig.3. Curves of sounding with Darray and their transformations for two models (see details in th... more Fig.3. Curves of sounding with Darray and their transformations for two models (see details in the text)

Resistivity method, old and new

The Technology of the Joint Inversion of Conventional Well Logs for Evaluation of Double Porosity Carbonate Formations; #41942 (2016)

This work presents a new technology of well log interpretation for determining lithology, pore sy... more This work presents a new technology of well log interpretation for determining lithology, pore system characteristics, and saturations of double-porosity carbonate formations. This technology includes a unified petrophysical model for calculating the effective physical properties of carbonates and joint inversion of the following conventional logs: Pand S-wave transit times, resistivity, density, neutron porosity, gamma ray, and photoelectric absorption property. The inversion procedure consists in minimizing the cost function, which contains the sum of weighted square differences between the measured and calculated logs, and the regularization functional with additional information, initial model parameters, and ranges of their variations. The following petrophysical parameters are obtained by the inversion: a) volumes of limestone, dolomite, and shale; b) porosities of matrix, fractures, and vugs; c) connectivity of fractures and vugs; and d) initial and residual oil saturations i...

The New Approach to the Analysis of the Azimuthal Resistivity Data Over Anisotropic Media

59th EAGE Conference & Exhibition, 1997

Propagation of Elastic Compressional Waves in a Porous-Fractured Medium Saturated with Immiscible Fluids

Izvestiya, Physics of the Solid Earth, 2020

Abstract The problem of calculating the reflection and transmission coefficients of elastic P -wa... more Abstract The problem of calculating the reflection and transmission coefficients of elastic P -wave incident from a porous half-space onto a fluid-filled crack is solved. The influence of capillary effects arising at the interface between a crack and a porous matrix on these coefficients is analyzed. In the first-order (single-) scattering approximation, the wave number of the effective P -wave propagating in a porous-fractured medium is calculated. It is shown that the hydrodynamic effects associated with fluid filtration at cracks’ boundaries in the field of an acoustic wave lead to significant frequency dispersion of the effective P -wave velocity.

Distortions of VES data caused by subsurface inhomogeneities

56th EAEG Meeting, 1994

The first (mainly used) model for VES method is based on horizontally layered structure. The seco... more The first (mainly used) model for VES method is based on horizontally layered structure. The second one includes different deep objects, such as faults, horsts, grabens, domes, etc. We introduce the third model, which includes horizontal layers, deep objects, and many subsurface objects of different resistivities, referred to as subsurface inhomogeneities (SSIs).

3rd EEGS Meeting, 1997

For the control of a hvdro-geological situation on the channel Oder-Spree in Brandenburg land. Oe... more For the control of a hvdro-geological situation on the channel Oder-Spree in Brandenburg land. Oerman'' a firm Umweltanal y tik Brandenburg GmbH together with MSU developed hardware and software for aquatorial electrical surve. At construction of such instrumentation the basic problern consists in management of measuring process. The measurements on aquatona are carried oul in a movement in real time and without an opportunity to re-measure of separate readings. The software is intended for work in multitask operating systems as Windows lxx, that has caused necessztv of s nchronisation of all hardware parts in the process of measurement. The hardware complex inciudes the managing Notebook computer. AiD converter. clock generator and an analog measuring part. which inciudes a measuring cable with electrodes and amplifiers. On each site of measurement signals from 32 channels were measured during two seconds. As A/D 26 channel converter was used. switclung between groups of 16 channels was made on each site. Measurements of four AUSF values (ExL Ex2. Ex3. E). water resistivit and dipole axial sounding (DAS) on 20 spacings were maid, On each channel amplification a signal and canceling of industrial noise were made. To increase of reliabilit. the measurements ori each channel were carried Out with readings' accumulation and averaging. The instrumentation at the present provides the following operauons: Self-potential (SP) measurements of Ex component on threc channels and Ey component intended for search of water outflows and discharges. SP method is based on study filtration potentials. which are raised under action of groundwater. filtered through capillanes of rocks. Thus the water outflow through aquatona bonom causes negative SP potential. and the discharge subterranean water in the river raises positive SP anomalies: Resistivimetry (R) serves for determination of an electrical resistivity of water, which depends on its ininerahzation and can speci1 places of subterranean waters' discharge and sites of aqualorial pollution: Dipole axial sounding (DAS) is carried Out ith- .

69th EAGE Conference and Exhibition incorporating SPE EUROPEC 2007, 2007

In this paper we present an electromagnetic technology for non destructive surface inspection of ... more In this paper we present an electromagnetic technology for non destructive surface inspection of metallic pipelines that includes the determination of pipeline position and depth, assessment of technical condition of an insulation coating, and estimation of operating state of a cathodic protection system. This technology is based on the approximation of a metallic pipeline by a heterogeneous transmission line. In the model, the pipeline with damage of the insulated coating (variations of leakage resistance) and deterioration of the tube wall thickness (changes of tube impedance) is represented by uniform transmission line segments (piecewise model). This approach reduces the problem dimensions to 1D and allows us to obtain the analytical solution for calculating the voltage, current, and magnetic field distributions for single and group interconnected pipelines. Using the transmission line model we have simulated the voltage and current distributions for two interconnected pipelines with variable insulated coating in the low frequency range. The field operations consist in measurements of (1) the magnetic field created by the current flowing in a pipeline, (2) voltages on the control posts of cathodic protection, and (3) soil resistivity. We present the example of this technology application for the practical inspection of group interconnected oil pipelines.

Metal, Ceramic and Polymeric Composites for Various Uses, 2011

Rational investor hypothesis, efficient markets hypothesis(EMH), and random walk of yield rate ar... more Rational investor hypothesis, efficient markets hypothesis(EMH), and random walk of yield rate are three basic concepts of modern capital market theory. However, it could not be proved that real capital markets are full with rational investors. The theory, which regards the price movement of capital market as random walks, and regards the yield time series as a normal distribution, is not supported by the real statistics data usually. A capital market, in essence, could be regarded as a complex system, which consists of masses of investors. Investors make investment decision basing on the public or private information inside or outside the market. The movement of price and volume is the emergency of investors' group behavior. With the sustained growth of computational capabilities and the appearance of complexity science, artificial life, multi-agent system (MAS), and cellular automata (CA) are provided for the modeling of complex system. Researchers got powerful tools to build discrete dynamics model for the capital market for the first time. The Santa Fe artificial stock market(SF-ASM), which is presented by Santa Fe institution in 1970s, is the original version of the artificial financial market(AFM). Modeling for the microstructure of the capital market, made the verification and falsification of economics theories possible. On the part of macroscopic statistical data of the market, a series non-linear dynamic analysis method, such as fractal statistics, had been applied to analysis of financial time series. New research methods, which are used both in microscopic and macroscopic aspects of capital market, help us build brand new dynamic models for capital markets. The appearance of SF-ASM has influenced this area deeply. Most successors are the variety or improvement of SF-ASM. SF-ASM is a kind of MAS, which focuses on simulating heterogeneous investors' investment behaviours. In my opinion, the investment process of an investor can be divided into 2 steps: forecasting and decision. The forecasting step is how an investor considers public or private information inside or outside of the market. And the decision step is how an investor reacts to the prediction. Rational investor hypothesis and various investment decision processes in SF-ASM are just different ways to deal with information. Basing on neoclassicism economics, EMH announce that the price in the market reflects all information, or at least all public information, and that rational investors react to these information in the same way. Multi-Agent based SF-ASM supports heterogeneous investors in reacting to information in various ways, but provides public price as the only information. The fact that information relating to the market is homogeneous and public to each investor can be compared to the gas filling the whole www.intechopen.com Cellular Automata -Simplicity Behind Complexity 360 " c o n t a i n e r o f m a r k e t " . H o w e v e r , a s w e k n o w , i n r e a l c a p i t a l m a r k e t s , e x c e p t p u b l i c information including the announcement, annual report, interest rate etc., there are also inside information, individual attitudes or predictions, and even emotions, which can influence investors' investment. What's more, information is time sensitive. Because nonpublic information may reach investors in different time, the situation of real capital market could be more complex. So SF-ASM is more "efficient" than real capital markets for it's simplifying the description of information. If we describe the non-public information in an AFM model, the interoperation among individual investors can be expressed certainly. As a result, the cellular automaton (CA) is adopted. Classical CA is a kind of large scale discrete dynamical systems. Each cell in CA can interoperate with neighbors in a local scope, which is defined by CA's neighborhood. Yiming Wei, Shang-jun Ying, Ying Fan, and Bing-Hong Wang presented a CA based AFM in 2003. In this model, the local interoperation of CA is used to describe the spread of the herd behavior in capital markets. However, the neighborhood of this CA based AFM is still classical Moore neighborhood. All the investors in this AFM have the same simple investment behavior rule. The pricing mechanism of the market is far from the realistic markets. In real capital markets, as we know, the non-public information spreads through the investors' social network, rather than 2-D lattice. The connectivity, diameter, and degree distribution of the social network can decide the speed and scope of the information spreading. Furthermore, social network is not a fix, but dynamic structure. According to the above reasons, combining the feature of multi-agent system and complex network, we extend the definition of CA in following aspects in this chapter: Neighborhood with network topology is adopted in CA; Structure of neighborhood is no more fixed, and will change following the neighborhood evolution rule; Cells in CA are no more homogeneous, and each cell has its own state transfer function with the same interoperation interface. Combining the above extensions of CA, as well as the other researchers' research on cellular automata on networks (or graph automata), we present a formal definition of CA on networks. On the basis of CA on networks, a new artificial financial market modeling framework, Emergency-AFM (E-AFM), is introduced in this chapter. E-AFM provides all standard interfaces and full functional components of AFM modeling. It includes classification and expression of information, uniform interfaces for investors' prediction and decision process, uniform interface for pricing mechanism, and analysis tools for time series. E-AFM is a modeling framework for any kind of AFM. By instantiating the investors' asset structure, neighborhood network, behavior rules of investors, and pricing mechanism, we can get a specific AFM model. After an AFM model is simulated, we can get a price and volume time series in standard format just like real capital markets. Analysis tools provided by E-AFM, such as Hurst exponent and Lyapunov exponent, can be used to measure the fluctuation feature of price/yield time series. We can compare the simulation data with the real capital market data. Also we can find the relationship between the fluctuation feature and the topology of social networks. In the rest of this chapter, an E-AFM based AFM model is introduced. This model is a simple model which is designed to find the relationship between the fluctuation feature of price time series and the degree distribution of the social network (neighborhood of CA). The statistics feature of neighbourhood structure is observed and compared with the fluctuation feature of price/yield time series. It is not a perfect model to get a new capital theory, but we can still realize how cellular automata can help us to do research in financial area.

Study of Working and Projected Pipelines with Electrical Methods

60th EAGE Conference and Exhibition, 1998

Pipelines are the systems of life-support of a modern society. In pipes oil and gas, tap and tech... more Pipelines are the systems of life-support of a modern society. In pipes oil and gas, tap and technical water, water for heating are supplied; household and industrial sewage are removed. The large part of pipes is dipped in ground.

5th EEGS-ES Meeting, 1999

The stream function described is employed for the presentation of 2D DC modeling results. The 2D ... more The stream function described is employed for the presentation of 2D DC modeling results. The 2D model is understood as a 2D medium with linear current electrodes, oriented along the inhomogeneities' strike direction. In this case both the medium and the electric field depend on two space coordinates only. Modeling becomes much easier than considering point current electrodes, where the electrical field always is three-dimensional. Meanwhile the actual results of such modeling are qualitatively equivalent to 3D modeling with point electrodes, as long as the measurements are conducted across the objects. The classical modeling presentation is in apparent resistivity which reflects an electric field distribution on the earth's surface. Quite often the connection of measured anomalies with a geoelectrical model is rather complex (fig. 1, A and C). The visualization of DC current lines simplifies understanding of the electric field's structure. Current lines are used in almost each textbook, but a practical technique for their construction is usually not included. The evident way for drawing current-lines is the step by step continuation of a line from some point along the electric field direction. The practical realization of such approach is not trivial. For a 2D field it is possible to use the stream-function. This function is often used in EM field modeling [flux function, Berdichevsky, 1984]. A contour map of the streamfunction corresponds to the streamline distribution. Thus the problem of current streamlines' construction is reduced to the calculation of the streamfunction in the research area. This can be achieved by calculating secondary surface charges, which are determined at 2D modeling, using Fredholm's integral equation of the second type relatively of electric field [Escola, 1979].

4th EEGS Meeting, 1998

Anisotropy of rocks' resistivity is a weak enough phenomenon in comparison with inhomogeneity inf... more Anisotropy of rocks' resistivity is a weak enough phenomenon in comparison with inhomogeneity influence. That is why we are trying to find an array being the most sensitive to anisotropy and to develop field survey and data processing technology for anisotropy and inhomogeneity influence estimation and separation. New step in this study gives arrow-type array. Fig.1. Spectra of arrays. Curves are marked with angle θ value.

Interpretation of Resistivity Sounding Data - Distorted by Geological Noise

61st EAGE Conference and Exhibition, 1999

The traditional resistivity sounding method deals with isolated sounding sites located casually o... more The traditional resistivity sounding method deals with isolated sounding sites located casually on profile or area and executed with logarithmic step in distante growth. This technology has very restricted possibilities.

Anisotropy Effects Investigations by Resistivity Method in Some Inhomogeneous Media

57th EAEG Meeting, 1995

Resistivity method is usually applied for horizontally-layered media investigation as sounding, a... more Resistivity method is usually applied for horizontally-layered media investigation as sounding, and for inhomogeneous media as profiling.

Transport in Porous Media, 2009

Motivated by recent numerical results, we study the quantum phase transitions between Z2 spin liq... more Motivated by recent numerical results, we study the quantum phase transitions between Z2 spin liquid, Néel ordered, and various valence bond solid (VBS) states on the honeycomb and square lattices, with emphasis on the staggered VBS. In contrast to the well-understood columnar VBS order, the staggered VBS is not described by an XY order parameter with ZN anisotropy close to these quantum phase transitions. Instead, we demonstrate that on the honeycomb lattice, the staggered VBS is more appropriately described as an O(3) or CP(2) order parameter with cubic anisotropy, while on the square lattice it is described by an O(4) or CP(3) order parameter.

Journal of Petroleum Science and Engineering, 2007

In this paper we propose a new approach of well log data interpretation for determining lithologi... more In this paper we propose a new approach of well log data interpretation for determining lithological and petrophysical characteristics of double-porosity carbonate formations containing shales. This approach is based on the theoretical calculation of rock physical properties and joint simultaneous inversion of the following conventional logs: P-and S-wave transit times, resistivity, density, neutron porosity, and gamma ray. The inversion procedure consists in minimizing a cost function that includes the sum of weighted square differences between the measured and calculated logs, and the regularization functional containing additional information (initial model parameters and ranges of their variations). The petrophysical parameters determined by the inversion are a shale volume, dolomite volume, matrix porosity, secondary porosity and secondary porosity type (aspect ratios of spheroids approximating secondary pores). To calculate the theoretical logs we use the formation model that corresponds to a transversely isotropic medium composed of intercalated layers of carbonates with secondary porosity of different types and shales. The carbonate rocks are treated as a composite material that consists of a homogeneous isotropic matrix (solid skeleton and matrix pore system) where the secondary pores represented by spheroids are embedded. The matrix physical properties are calculated taking into account the mineral composition of solid components. For computing the effective properties we apply the symmetrical self-consistent method of the effective medium approximation. The shale properties as well mineral and fluid characteristics can be considered as known and they are adjusted by the posterior analysis of error distributions for each log. The results of joint inversion obtained for various boreholes from vuggy and fractured carbonate reservoirs of the South Zone of Mexico show a good correspondence with core data, image log, and geological descriptions. Based on the experimental data we demonstrate that the output inversion parameters can be used to improve the classification of carbonate lithotypes and assessment of the secondary pore interconnections required for the permeability prediction.

Simulation of the Electrical Resistivity of Dual-Porosity Carbonate Formations Saturated with Fluid Mixtures

Preview Determination of the water saturation is the crucial point in formation evaluation. For t... more Preview Determination of the water saturation is the crucial point in formation evaluation. For this purpose the well log data are widely used. Traditional estimation of the water saturation from the resistivity logs uses models described by Archie? s law. These models consider ...

Simulation of the Electrical Resistivity of Dual-Porosity Carbonate Formations Saturated with Fluid Mixtures

Preview Determination of the water saturation is the crucial point in formation evaluation. For t... more Preview Determination of the water saturation is the crucial point in formation evaluation. For this purpose the well log data are widely used. Traditional estimation of the water saturation from the resistivity logs uses models described by Archie? s law. These models consider ...