Pub Date : 2024-02-21DOI: 10.18303/2619-1563-2023-3-17
K. Sukhorukova
During drilling, formation fluids are pushed aside by mud filtrate. As a result, the electrophysical properties of rocks near the borehole wall change. Sounding methods are used to determine the resistivity of the part of the reservoir that is remote from the well and unchanged during drilling. Among these methods, electromagnetic logging has the best spatial resolution. However, when analyzing the practical data of electromagnetic sounding, "wrong" ratios of signals from probes of different lengths are often observed, including those showing penetration in impermeable rocks. One of the reasons may be the influence of the shift of the device from the axis of symmetry of the medium. The paper considers the results of numerical simulation of signals from decentralized probes of LWD and VEMKZ instruments in some models.
{"title":"Effect of eccentricity on electromagnetic logging signals with LWD and VEMKZ instruments (numerical simulation results from some publications)","authors":"K. Sukhorukova","doi":"10.18303/2619-1563-2023-3-17","DOIUrl":"https://doi.org/10.18303/2619-1563-2023-3-17","url":null,"abstract":"During drilling, formation fluids are pushed aside by mud filtrate. As a result, the electrophysical properties of rocks near the borehole wall change. Sounding methods are used to determine the resistivity of the part of the reservoir that is remote from the well and unchanged during drilling. Among these methods, electromagnetic logging has the best spatial resolution. However, when analyzing the practical data of electromagnetic sounding, \"wrong\" ratios of signals from probes of different lengths are often observed, including those showing penetration in impermeable rocks. One of the reasons may be the influence of the shift of the device from the axis of symmetry of the medium. The paper considers the results of numerical simulation of signals from decentralized probes of LWD and VEMKZ instruments in some models.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"3 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140442870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-21DOI: 10.18303/2619-1563-2023-3-4
A. Yablokov, A. Serdyukov, R. A. Efremov
This paper discusses examples of testing a new implementation of the method of multi-channel surface wave analysis on synthetic data computed for elastic media with complex boundary geometry. The new implementation of the method includes developed algorithms for noise-resistant spectral analysis based on time-frequency domain filtering of seismograms and inversion of dispersion curves of phase velocities based on determination of ranges of possible transverse wave velocity models and application of artificial neural networks. Based on the results of synthetic data processing, the accuracy, lateral resolution limitations and applicability limits of the method under consideration are evaluated.
{"title":"Method of automated extracting dispersion curves based on time-frequency distribution of seismic data","authors":"A. Yablokov, A. Serdyukov, R. A. Efremov","doi":"10.18303/2619-1563-2023-3-4","DOIUrl":"https://doi.org/10.18303/2619-1563-2023-3-4","url":null,"abstract":"This paper discusses examples of testing a new implementation of the method of multi-channel surface wave analysis on synthetic data computed for elastic media with complex boundary geometry. The new implementation of the method includes developed algorithms for noise-resistant spectral analysis based on time-frequency domain filtering of seismograms and inversion of dispersion curves of phase velocities based on determination of ranges of possible transverse wave velocity models and application of artificial neural networks. Based on the results of synthetic data processing, the accuracy, lateral resolution limitations and applicability limits of the method under consideration are evaluated.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"22 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140444837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.18303/2619-1563-2023-2-4
A. Fomin, I. A. GubinI, S. A. Moiseev
The results of regional geological exploration at the expense of the federal budget on the territory of the Central Tunguska prospective petroleum region located in the Republic of Sakha (Yakutia) over the past 17 years are analyzed. To date, the territory of the Yakut part of the Central Tunguska PPR is closed by modern regional geological exploration by 77.9 %, which allows us to speak about the completion of the regional stage of geological exploration here. It was shown that Vendian terrigenous deposits and Vendian carbonate, subsalt deposits of the Lower Cambrian, as well as carbonates of intersalt deposits of the Cambrian have the greatest prospects for oil and gas potential. Riphean deposits have a limited distribution. Based on the results of these works, promising objects for prospecting work were identified.
{"title":"Generalization of regional seismic results within the Central Tunguska prospective petroleum region","authors":"A. Fomin, I. A. GubinI, S. A. Moiseev","doi":"10.18303/2619-1563-2023-2-4","DOIUrl":"https://doi.org/10.18303/2619-1563-2023-2-4","url":null,"abstract":"The results of regional geological exploration at the expense of the federal budget on the territory of the Central Tunguska prospective petroleum region located in the Republic of Sakha (Yakutia) over the past 17 years are analyzed. To date, the territory of the Yakut part of the Central Tunguska PPR is closed by modern regional geological exploration by 77.9 %, which allows us to speak about the completion of the regional stage of geological exploration here. It was shown that Vendian terrigenous deposits and Vendian carbonate, subsalt deposits of the Lower Cambrian, as well as carbonates of intersalt deposits of the Cambrian have the greatest prospects for oil and gas potential. Riphean deposits have a limited distribution. Based on the results of these works, promising objects for prospecting work were identified.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114885776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.18303/2619-1563-2023-2-47
A. E. Izmaylova
The article discusses the method of petrophysical research, which was developed at the beginning of the XXI century. The study provides data related to the study of the Volga–Ural oil and gas province. Using the example of the Romashkinskoe field, it is shown how the use of petrophysical characteristics made it possible to clarify the interpretation of geophysical studies of wells. The conclusion is made about the relevance of using this method in analyzing the state of mineral reserves in the deposits of the Volga-Ural province.
{"title":"Development of methods for increasing oil recovery of hard-to-recover reserves of the Romashkinskoe field","authors":"A. E. Izmaylova","doi":"10.18303/2619-1563-2023-2-47","DOIUrl":"https://doi.org/10.18303/2619-1563-2023-2-47","url":null,"abstract":"The article discusses the method of petrophysical research, which was developed at the beginning of the XXI century. The study provides data related to the study of the Volga–Ural oil and gas province. Using the example of the Romashkinskoe field, it is shown how the use of petrophysical characteristics made it possible to clarify the interpretation of geophysical studies of wells. The conclusion is made about the relevance of using this method in analyzing the state of mineral reserves in the deposits of the Volga-Ural province.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121899669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.18303/2619-1563-2023-2-56
D. A. Neklyudov, M. I. Protasov
We present a simple and robust approach for calculating frequency-dependent rays in three dimensional media. The proposed method simulates propagation of locally plane fragment of a wavefront. Ray properties depends on velocity distribution in some sub-volume around the ray and on wavelength in each point. Numerical experiment demonstrates the applicability of the proposed method to calculate travel-times and ray-based acoustic wavefields in complex 3D environments with the presence of slat intrusion.
{"title":"3D Lomax rays and its application for acoustic wavefield simulation in complex media","authors":"D. A. Neklyudov, M. I. Protasov","doi":"10.18303/2619-1563-2023-2-56","DOIUrl":"https://doi.org/10.18303/2619-1563-2023-2-56","url":null,"abstract":"We present a simple and robust approach for calculating frequency-dependent rays in three dimensional media. The proposed method simulates propagation of locally plane fragment of a wavefront. Ray properties depends on velocity distribution in some sub-volume around the ray and on wavelength in each point. Numerical experiment demonstrates the applicability of the proposed method to calculate travel-times and ray-based acoustic wavefields in complex 3D environments with the presence of slat intrusion.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126519003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.18303/2619-1563-2023-2-16
R. A. Efremov, A. Serdyukov, A. Yablokov
An important application of the multichannel surface wave (MASW) method is seismic safety assessment. The key parameters in the calculation of increments in the input of seismic microzoning are the thickness and average velocity of the soil mass lying on the base of more rigid rocks. To determine these parameters, we propose a new method for constructing horizontally layered models of the upper part of the geological section using the features (positions of extrema of the second derivative) of the dispersion curves of phase velocities of the Rayleigh surface wave, which, as shown by numerical experiments, are associated with the position of contrasting boundaries in the medium under study. (e.g., the boundary between soils and rocks). This approach is much simpler than the problem of recovering a horizontally layered model traditionally solved in the MASW method from a set of phase velocities for a sequence of frequencies and does not require an initial approximation and/or any restrictions on the possible values of the model parameters. In the case of two-layer and three-layer media, our approach is reduced to a simple and fast application of explicit formulas.
{"title":"Determination of the contrast boundaries of the low velocity zone by analyzing the features of the dispersion curves of the Rayleigh wave velocities based on empirical dependencies","authors":"R. A. Efremov, A. Serdyukov, A. Yablokov","doi":"10.18303/2619-1563-2023-2-16","DOIUrl":"https://doi.org/10.18303/2619-1563-2023-2-16","url":null,"abstract":"An important application of the multichannel surface wave (MASW) method is seismic safety assessment. The key parameters in the calculation of increments in the input of seismic microzoning are the thickness and average velocity of the soil mass lying on the base of more rigid rocks. To determine these parameters, we propose a new method for constructing horizontally layered models of the upper part of the geological section using the features (positions of extrema of the second derivative) of the dispersion curves of phase velocities of the Rayleigh surface wave, which, as shown by numerical experiments, are associated with the position of contrasting boundaries in the medium under study. (e.g., the boundary between soils and rocks). This approach is much simpler than the problem of recovering a horizontally layered model traditionally solved in the MASW method from a set of phase velocities for a sequence of frequencies and does not require an initial approximation and/or any restrictions on the possible values of the model parameters. In the case of two-layer and three-layer media, our approach is reduced to a simple and fast application of explicit formulas.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129765053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.18303/2619-1563-2023-2-29
N. K. Vasilenko, T. Nefedkina, G. A. Dugarov, R. K. Bekrenyov
The paper considers PP-wave attenuation in an anisotropic fractured medium covering the target layer. Azimuthal and offset variations of inverse quality factor (QVOA) were estimated from 3D seismic data by a software module developed in IPGG SB RAS. Spectral ratio method was used to estimate attenuation. We used developed QVOA inversion module on 3D CDP data from one of the fields in the Republic of Serbia. The distributions of fracturing orientation and attenuation anisotropy degree in the layer of Neogene rock are presented as results. This layer covers Paleozoic basement, which is the main target layer for oil exploration in this area. The obtained distributions should be considered during AVAZ inversion interpretation of reflections from Paleozoic basement due to possible footprints.
{"title":"Azimuthal analysis of pp-wave attenuation in a fractured medium covering a target layer using wide-azimuth seismic survey data","authors":"N. K. Vasilenko, T. Nefedkina, G. A. Dugarov, R. K. Bekrenyov","doi":"10.18303/2619-1563-2023-2-29","DOIUrl":"https://doi.org/10.18303/2619-1563-2023-2-29","url":null,"abstract":"The paper considers PP-wave attenuation in an anisotropic fractured medium covering the target layer. Azimuthal and offset variations of inverse quality factor (QVOA) were estimated from 3D seismic data by a software module developed in IPGG SB RAS. Spectral ratio method was used to estimate attenuation. We used developed QVOA inversion module on 3D CDP data from one of the fields in the Republic of Serbia. The distributions of fracturing orientation and attenuation anisotropy degree in the layer of Neogene rock are presented as results. This layer covers Paleozoic basement, which is the main target layer for oil exploration in this area. The obtained distributions should be considered during AVAZ inversion interpretation of reflections from Paleozoic basement due to possible footprints.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133460173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-26DOI: 10.18303/2619-1563-2023-1-54
A. M. Kamashev, A. Duchkov
This work is devoted to the development and testing of an algorithm for adaptive subtraction of multiple reflected waves using a convolutional neural network. The algorithm is one of the main steps in the method of suppression of multiple reflected waves based on the separation of wave forms in the Radon region. The paper considers the formulation of a problem for a neural network, the preparation of training and test data sets and the testing of the algorithm. Using a convolutional neural network allows to automate and speed up the adaptive subtraction procedure. The algorithm was tested on synthetic data. Testing shows the effective adaptation of multiple waves, as well as the importance of correctly constructing a model of multiples.
{"title":"Application of machine learning for adaptive subtraction of multiple reflected waves","authors":"A. M. Kamashev, A. Duchkov","doi":"10.18303/2619-1563-2023-1-54","DOIUrl":"https://doi.org/10.18303/2619-1563-2023-1-54","url":null,"abstract":"This work is devoted to the development and testing of an algorithm for adaptive subtraction of multiple reflected waves using a convolutional neural network. The algorithm is one of the main steps in the method of suppression of multiple reflected waves based on the separation of wave forms in the Radon region. The paper considers the formulation of a problem for a neural network, the preparation of training and test data sets and the testing of the algorithm. Using a convolutional neural network allows to automate and speed up the adaptive subtraction procedure. The algorithm was tested on synthetic data. Testing shows the effective adaptation of multiple waves, as well as the importance of correctly constructing a model of multiples.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116670280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-26DOI: 10.18303/2619-1563-2023-1-4
A. Manstein, P. Sokolov
A description of the hardware–software complex designed and manufactured for the operational assessment of the concentration of a dissolved substance in a water stream on the lower surface of metal pipes in various technological lines without sampling is presented. At the Trofimuk Institute of Petroleum Geology and Geophysics SB RAS the dependences of the electrical conductivity of aqueous solutions on temperature were studied under specific conditions – in an electrically conductive cell. Physical experiments were performed using solutions of different mineralization (from 0.5 to 300 g/L), in a measuring cell made of steel of small volume (8.14 cm3). Mathematical modeling of solution mineralization assessment has been performed.
{"title":"Method for measuring the mineralization of aqueous solutions in pipeline flows","authors":"A. Manstein, P. Sokolov","doi":"10.18303/2619-1563-2023-1-4","DOIUrl":"https://doi.org/10.18303/2619-1563-2023-1-4","url":null,"abstract":"A description of the hardware–software complex designed and manufactured for the operational assessment of the concentration of a dissolved substance in a water stream on the lower surface of metal pipes in various technological lines without sampling is presented. At the Trofimuk Institute of Petroleum Geology and Geophysics SB RAS the dependences of the electrical conductivity of aqueous solutions on temperature were studied under specific conditions – in an electrically conductive cell. Physical experiments were performed using solutions of different mineralization (from 0.5 to 300 g/L), in a measuring cell made of steel of small volume (8.14 cm3). Mathematical modeling of solution mineralization assessment has been performed.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117185870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-26DOI: 10.18303/2619-1563-2023-1-13
V. Plotkin
When solving inverse problems of magnetotelluric sounding (MTS), equivalent solutions appear, noticeably different from each other. But the solution of a direct problem under a given medium model and boundary conditions is the only one, the response of the medium to the source of the electromagnetic field is unique. An algorithm is considered that leads to an accurate solution of the test problem when striving for zero inconsistencies in input and model data. Several starting medium models and two optimization methods are used: a nonlinear least squares method with calculations of the sensitivity matrix and a method based on metaheuristic algorithms used when target functions have several local minima. Using numerical calculations, a stable solution of the inverse MTS problem for the 3D-medium model was obtained.
{"title":"Algorithm for stable solution of inverse problem of magnetotelluric sounding","authors":"V. Plotkin","doi":"10.18303/2619-1563-2023-1-13","DOIUrl":"https://doi.org/10.18303/2619-1563-2023-1-13","url":null,"abstract":"When solving inverse problems of magnetotelluric sounding (MTS), equivalent solutions appear, noticeably different from each other. But the solution of a direct problem under a given medium model and boundary conditions is the only one, the response of the medium to the source of the electromagnetic field is unique. An algorithm is considered that leads to an accurate solution of the test problem when striving for zero inconsistencies in input and model data. Several starting medium models and two optimization methods are used: a nonlinear least squares method with calculations of the sensitivity matrix and a method based on metaheuristic algorithms used when target functions have several local minima. Using numerical calculations, a stable solution of the inverse MTS problem for the 3D-medium model was obtained.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"625 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114095918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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