Pub Date : 2022-09-15DOI: 10.22564/16cisbgf2019.034
C. Cardoso, F. Moraes, K. Lima
This paper seeks to interpret the 4D seismic timeshifts in the overburden of a conventional turbidite sandstone reservoir in the Campos Basin and to calculate an empirical factor of sensitivity between these 4D data and the geomechanical deformations. Gaining information on how the production of the reservoir affects the surrounding rocks is of great interest for the management of oil fields, with impacts ranging from optimization of production to the safety of operations and workers. The study of timeshift anomalies are common in chalk fields and unconventional fields of high temperature or pressure. We used two techniques for timeshift calculations, cross-correlation and DTW, as well as structural attributes that are calculated to assist in interpretations. Then, we estimate the sensitivity factor, which allows the construction of synthetic 4D timeshifts from the deformations simulated by the geomechanical model. In most of the field regions there was agreement between simulated deformations and 4D anomalies, showing that it is possible to extract useful information for reservoir management. The estimate of the sensitivity factor indicates that the overburden studied is sensitive to deformations in the rocks, allowing that small deformations can be detected by the given 4D seismic.
{"title":"Analysis of 4D seismic timeshifts overburden and its relationship with the geomechanical model of reservoirs in a Campos Basin field","authors":"C. Cardoso, F. Moraes, K. Lima","doi":"10.22564/16cisbgf2019.034","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.034","url":null,"abstract":"This paper seeks to interpret the 4D seismic timeshifts in the overburden of a conventional turbidite sandstone reservoir in the Campos Basin and to calculate an empirical factor of sensitivity between these 4D data and the geomechanical deformations. Gaining information on how the production of the reservoir affects the surrounding rocks is of great interest for the management of oil fields, with impacts ranging from optimization of production to the safety of operations and workers. The study of timeshift anomalies are common in chalk fields and unconventional fields of high temperature or pressure. We used two techniques for timeshift calculations, cross-correlation and DTW, as well as structural attributes that are calculated to assist in interpretations. Then, we estimate the sensitivity factor, which allows the construction of synthetic 4D timeshifts from the deformations simulated by the geomechanical model. In most of the field regions there was agreement between simulated deformations and 4D anomalies, showing that it is possible to extract useful information for reservoir management. The estimate of the sensitivity factor indicates that the overburden studied is sensitive to deformations in the rocks, allowing that small deformations can be detected by the given 4D seismic.","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131887483","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 : 2020-09-08DOI: 10.22564/16cisbgf2019.182
J. Ribeiro, N. Okita, T. Coimbra, G. Ignácio, M. Tygel
Since the end of the 1990s, methods of imaging and inversion have been receiving systematic attention, through multiparametric traveltimes, such as the Common-Reflection-Surface (CRS) method, in its two versions zero offset (ZO) and finite offset (FO), and the Offset Continuation Trajectory (OCT). Despite its superior quality to traditional methods, OCT and CRS face the challenges of additional computation costs, which stem from the required multiparameter estimations. The problem of estimating the slope, curvature, and velocity parameters reliably and efficiently has been drawing focus in the seismic literature. Mathematically, approaches to solve that problem rely on global optimization techniques. The main challenges are robustness (small relative sensitivity to given initial values) and convergence speed. The Differential Evolution (DE) has shown promising results. That method has a welcome property of robustness, however also the drawback of undesired convergence speed. In this paper, we propose overcoming this problem upon applying the Adaptive Differential Evolution known as JADE. Qualitative results from synthetic and real datasets show, for similar execution times, the fast convergence of JADE when compared with that of DE. Therefore, JADE presents itself as a great alternative to DE, showing even more promising results regarding estimating the parameters of OCT and CRS.
{"title":"Using Adaptive Differential Evolution algorithm to improve parameter estimation in seismic processing","authors":"J. Ribeiro, N. Okita, T. Coimbra, G. Ignácio, M. Tygel","doi":"10.22564/16cisbgf2019.182","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.182","url":null,"abstract":"Since the end of the 1990s, methods of imaging and inversion have been receiving systematic attention, through multiparametric traveltimes, such as the Common-Reflection-Surface (CRS) method, in its two versions zero offset (ZO) and finite offset (FO), and the Offset Continuation Trajectory (OCT). Despite its superior quality to traditional methods, OCT and CRS face the challenges of additional computation costs, which stem from the required multiparameter estimations. The problem of estimating the slope, curvature, and velocity parameters reliably and efficiently has been drawing focus in the seismic literature. Mathematically, approaches to solve that problem rely on global optimization techniques. The main challenges are robustness (small relative sensitivity to given initial values) and convergence speed. The Differential Evolution (DE) has shown promising results. That method has a welcome property of robustness, however also the drawback of undesired convergence speed. In this paper, we propose overcoming this problem upon applying the Adaptive Differential Evolution known as JADE. Qualitative results from synthetic and real datasets show, for similar execution times, the fast convergence of JADE when compared with that of DE. Therefore, JADE presents itself as a great alternative to DE, showing even more promising results regarding estimating the parameters of OCT and CRS.","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134492020","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 : 2019-04-01DOI: 10.3997/2214-4609.201900026
D. Lecerf
Summary Reservoir monitoring studies need distinctive consideration when it comes to the removal of undesirable artefacts caused by variations in seismic data acquisition. By attempting to repeat the source and receiver geometries, and parameters, between surveys as precisely as possible, any subsequent 4D noise is minimized. However, in some cases it is uneconomic or not possible to repeat the survey geometries between vintages. This is the case when different OBN seabed layout is used or a towed streamer survey is combined with an OBS acquisition.
{"title":"New 4D imaging approaches with atypical sparse seismic acquisitions for reservoir monitoring","authors":"D. Lecerf","doi":"10.3997/2214-4609.201900026","DOIUrl":"https://doi.org/10.3997/2214-4609.201900026","url":null,"abstract":"Summary Reservoir monitoring studies need distinctive consideration when it comes to the removal of undesirable artefacts caused by variations in seismic data acquisition. By attempting to repeat the source and receiver geometries, and parameters, between surveys as precisely as possible, any subsequent 4D noise is minimized. However, in some cases it is uneconomic or not possible to repeat the survey geometries between vintages. This is the case when different OBN seabed layout is used or a towed streamer survey is combined with an OBS acquisition.","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128365103","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}
This work is focused on processing, and imaging of the selected L2140266 line of the Jequitinhonha Basin, Bahia, based on the NMO and CRS stacking methodologies and the Inversion of the NIP wave, where the of post-stacking Kirchhoff migration in time is in depth, and common to all techniques. Beyond in addition, the partial-CRS stack was applied to densification of CMPs. Several tests were performed to optimize parameters, operator openings, minimize the objective function and regularize the parameters of the model, and as a result the flowchart of generated better visual quality of the sections, the main results compared in the course of the work for both methodologies.
{"title":"Processing, Inversion and Imaging of Seismic Marine Data of Basin of Jequitinhonha","authors":"W. Vieira, L. Leite, R. N. Carneiro, I. M. Silva","doi":"10.1190/SBGF2017-255","DOIUrl":"https://doi.org/10.1190/SBGF2017-255","url":null,"abstract":"This work is focused on processing, and imaging of the selected L2140266 line of the Jequitinhonha Basin, Bahia, based on the NMO and CRS stacking methodologies and the Inversion of the NIP wave, where the of post-stacking Kirchhoff migration in time is in depth, and common to all techniques. Beyond in addition, the partial-CRS stack was applied to densification of CMPs. Several tests were performed to optimize parameters, operator openings, minimize the objective function and regularize the parameters of the model, and as a result the flowchart of generated better visual quality of the sections, the main results compared in the course of the work for both methodologies.","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127488545","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 : 1900-01-01DOI: 10.22564/16cisbgf2019.045
Júlia Amorim, L. Prado, Elder Yokoyama
The study of natural signals demands robust techniquest to allow comprehension of active physical mechanisms. However, many of these signals show non-stationary characteristics, whose average rate varies over time, preventing the applications of classic spectral methods, such as the periodogram. The wavelet transform is a robust tool for non-stationary time series analysis and its use has spread in this field due to its ease of application through subroutines in several softwares. In this work, we present wavelet transform applied to two series of natural signals: number of sunspots and precipitation in Brasilia, Central Brazil. The goal was to identify cycles in both series and relate them to phenomena described in the literature, through the wavelet transform. Results showed a spectral peak at 11 years in Sunspot Series, related to Schwabe's cycle. For the Precipitation Series, a primary spectral peak of 21 years was identified, probably related to the temperature variance in the Pacific Ocean, and secondary cyclicity in 10-16 months. These results confirm the wavelet transform as a robust and satisfactory tool in the spectral study of non-stationary series.
{"title":"Análise espectral do sinal geofísico - exemplos de aplicação da transformada de ondeleta","authors":"Júlia Amorim, L. Prado, Elder Yokoyama","doi":"10.22564/16cisbgf2019.045","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.045","url":null,"abstract":"The study of natural signals demands robust techniquest to allow comprehension of active physical mechanisms. However, many of these signals show non-stationary characteristics, whose average rate varies over time, preventing the applications of classic spectral methods, such as the periodogram. The wavelet transform is a robust tool for non-stationary time series analysis and its use has spread in this field due to its ease of application through subroutines in several softwares. In this work, we present wavelet transform applied to two series of natural signals: number of sunspots and precipitation in Brasilia, Central Brazil. The goal was to identify cycles in both series and relate them to phenomena described in the literature, through the wavelet transform. Results showed a spectral peak at 11 years in Sunspot Series, related to Schwabe's cycle. For the Precipitation Series, a primary spectral peak of 21 years was identified, probably related to the temperature variance in the Pacific Ocean, and secondary cyclicity in 10-16 months. These results confirm the wavelet transform as a robust and satisfactory tool in the spectral study of non-stationary series.","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115682343","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 : 1900-01-01DOI: 10.22564/16cisbgf2019.005
D. Michelon, R. Ribeiro, João L. Caldeira, Carlos Siedschlag, F. Miranda, Heron A. Schots
Seismic imaging improvement have driven most of the efforts in the search of solutions as well as research and technology development. Paleozoic basins are in evidence in Brazil due to the great territorial area and lack of available information. These basins have a great potential for oil and gas accumulations. The existing discoveries have been mainly developed for power generation in the last years. Development of new technologies or techniques in the oil and gas sector usually requires high investment therefore cost reduction can be considered as a major improvement along enhance in seismic imaging quality. In this work we will discuss the results of a 2D seismic acquisition test using multi-weight source and the quality of the data with the different source sizes. The improvement associated to the stack of all the sources sizes together is also a significant result of this test.
{"title":"2D seismic acquisition using different source weights integrated in the stack","authors":"D. Michelon, R. Ribeiro, João L. Caldeira, Carlos Siedschlag, F. Miranda, Heron A. Schots","doi":"10.22564/16cisbgf2019.005","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.005","url":null,"abstract":"Seismic imaging improvement have driven most of the efforts in the search of solutions as well as research and technology development. Paleozoic basins are in evidence in Brazil due to the great territorial area and lack of available information. These basins have a great potential for oil and gas accumulations. The existing discoveries have been mainly developed for power generation in the last years. Development of new technologies or techniques in the oil and gas sector usually requires high investment therefore cost reduction can be considered as a major improvement along enhance in seismic imaging quality. In this work we will discuss the results of a 2D seismic acquisition test using multi-weight source and the quality of the data with the different source sizes. The improvement associated to the stack of all the sources sizes together is also a significant result of this test.","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116659280","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 : 1900-01-01DOI: 10.22564/16cisbgf2019.015
Julián L. Gómez, D. Velis
We introduce a novel dictionary learning strategy for removal of footprint patterns and random noise in seismic data. To this end, we construct an augmented dictionary based solely on the atoms learned from the coherenceconstrained dictionary learning (CDL), a method that is very effective on attenuating random noise. It turns out that when seismic data is contaminated with acquisition and/or processing footprint, the atoms of the learned dictionary are contaminated by coherent noise patterns. Hence, it is necessary to carry out a morphological and/or texture attribute classification of the atoms for effective footprint removal. Instead, the method that we propose relies on an augmented dictionary that is constructed using a simple data-driven empirical mode decomposition (EMD) algorithm, which leads to a dictionary that contains signal atoms and a residual dictionary that contains footprint atoms. This avoids the use of complex statistical classifications strategies to segregate the atoms of the learned dictionary. As in CDL, the proposed method does not require the user to know or adjust the noise level or the sparsity of the solution for each data set. Further, it only requires one pass of CDL dictionary learning and is shown to produce successful transfer learning results in field data. This leads to a speed-up of the denoising processing, since random and coherent noise can be removed without calculating the augmented dictionary for each time slice of the 3D data volume. Results on field data demonstrate effective footprint removal with accurate edge preservation on time slices of 3D seismic poststack data.
{"title":"A residual dictionary learning method for footprint removal from seismic data","authors":"Julián L. Gómez, D. Velis","doi":"10.22564/16cisbgf2019.015","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.015","url":null,"abstract":"We introduce a novel dictionary learning strategy for removal of footprint patterns and random noise in seismic data. To this end, we construct an augmented dictionary based solely on the atoms learned from the coherenceconstrained dictionary learning (CDL), a method that is very effective on attenuating random noise. It turns out that when seismic data is contaminated with acquisition and/or processing footprint, the atoms of the learned dictionary are contaminated by coherent noise patterns. Hence, it is necessary to carry out a morphological and/or texture attribute classification of the atoms for effective footprint removal. Instead, the method that we propose relies on an augmented dictionary that is constructed using a simple data-driven empirical mode decomposition (EMD) algorithm, which leads to a dictionary that contains signal atoms and a residual dictionary that contains footprint atoms. This avoids the use of complex statistical classifications strategies to segregate the atoms of the learned dictionary. As in CDL, the proposed method does not require the user to know or adjust the noise level or the sparsity of the solution for each data set. Further, it only requires one pass of CDL dictionary learning and is shown to produce successful transfer learning results in field data. This leads to a speed-up of the denoising processing, since random and coherent noise can be removed without calculating the augmented dictionary for each time slice of the 3D data volume. Results on field data demonstrate effective footprint removal with accurate edge preservation on time slices of 3D seismic poststack data.","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125777334","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 : 1900-01-01DOI: 10.22564/16cisbgf2019.263
Leonides Guireli Netto, O. Gandolfo, W. M. Filho, J. C. Dourado
{"title":"INTEGRAÇÃO DOS MÉTODOS DE SÍSMICA DE REFRAÇÃO DE ONDA S E ANÁLISE MULTICANAL DE ONDAS SUPERFICIAIS (MASW) EM BARRAGEM DE TERRA","authors":"Leonides Guireli Netto, O. Gandolfo, W. M. Filho, J. C. Dourado","doi":"10.22564/16cisbgf2019.263","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.263","url":null,"abstract":"","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125853920","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 : 1900-01-01DOI: 10.22564/16cisbgf2019.058
A. Baibatsha, Sandugash Satibekova, Zakira Baibatchayeva
{"title":"APPLICATION OF GEOPHYSICAL WELL LOGGING DATA TO ASSESS THE PHYSICALMECHANICAL PROPERTIES OF ROCKS","authors":"A. Baibatsha, Sandugash Satibekova, Zakira Baibatchayeva","doi":"10.22564/16cisbgf2019.058","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.058","url":null,"abstract":"","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123263773","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 : 1900-01-01DOI: 10.22564/16cisbgf2019.111
A. Oliva, C. L. Melo, Lia Weigert Bressan, F. S. Goudinho, M. J. Constant, W. Nakaema, F. D. Rosário, A. P. S. Musse
The implementation of the first CO2 MMV field lab in Brazil, located in Florianópolis, Santa Catarina state, offered an excellent opportunity for running controlled release experiments in a real open air environment. After three CO2-controlled release experiments run from 2011 up to 2015, PETROBRAS, the national oil company that is sponsoring the project, has launched a new challenge. The company stimulated the implementation of a new Brazilian experimental site located in a geologically more complex conditions and more challenging from a technological point of view. The choice of an area inside PUCRS campus, in Viamão Rio Grande do Sul state, was motivated by a predominantly clay subsoil and the privileged location of the site in terms of logistics and security, as the project houses high-tech equipments with significant cost. The purpose of this work is to present the results obtained by the geoelectrical remote time lapse using 3D electrical imaging technique to the monitoring of CO2 migration in both saturated and unsaturated clay-rich sediments in Viamão site, which is lithologically different from the Florianópolis field lab, composed of sandrich sediments. The CO2-controlled release occurred in 2016, covering an subsurface area of approximately 2.925 m. The CO2 was continuously injected through an injection well, at 3 m deep, in a period of 31 days (24 hours/day), at a rate ranging from 5 to 20 kg / day, totalizing 346 kg of injected CO2. While the CO2 was been injected, 3D electrical images using dipole-dipole array, were acquired in a daily base, totalizing 46 consecutive days (including periods before and after injection have been suspended). 3D (tridimensional) and 4D (time-lapsed) electrical imaging produced images up to 17 m below the surface. Remote monitoring has been used for the continuous characterization of the soil/sediment geoelectric responses, significantly increasing the accuracy with respect to the external effects that interfere in the geoelectric responses, such as excessive precipitation and changes in the injection rate. Comparison of post-injection electrical imaging results with pre-injection images
位于巴西圣卡塔琳娜州Florianópolis的首个CO2 MMV现场实验室的实施，为在真实的露天环境中进行控制释放实验提供了绝佳的机会。在2011年至2015年进行了三次二氧化碳控制释放实验之后，赞助该项目的巴西国家石油公司(PETROBRAS)发起了一项新的挑战。该公司在巴西建立了一个新的试验场，该试验场的地质条件更为复杂，从技术角度来看更具挑战性。选择位于南viam o Rio Grande do Sul州的PUCRS校园内的区域，主要是由于粘土底土和场地在物流和安全方面的优越位置，因为该项目容纳了成本高昂的高科技设备。本文的目的是利用三维电成像技术，利用地电远程时移技术监测viam站点中饱和和非饱和富粘土沉积物中的CO2迁移，该站点的岩性与Florianópolis野外实验室不同，由富砂沉积物组成。二氧化碳控制的释放发生在2016年，覆盖了大约2925米的地下面积。在31天(24小时/天)的时间里，通过一口3米深的注水井连续注入二氧化碳，注入速率从5到20千克/天不等，总共注入了346千克二氧化碳。在注入二氧化碳的同时，利用偶极子-偶极子阵列每天获取连续46天的三维电图像(包括暂停注入前后的时间)。3D(三维)和4D(延时)电成像产生了地表以下17米的图像。远程监测已被用于土壤/沉积物地电响应的连续表征，大大提高了干扰地电响应的外部影响的准确性，例如过度降水和注入速率的变化。注射后与注射前的电成像结果比较
{"title":"Geoelectrical Remote System for Monitoring Shallow Subsurface CO2 Migration","authors":"A. Oliva, C. L. Melo, Lia Weigert Bressan, F. S. Goudinho, M. J. Constant, W. Nakaema, F. D. Rosário, A. P. S. Musse","doi":"10.22564/16cisbgf2019.111","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.111","url":null,"abstract":"The implementation of the first CO2 MMV field lab in Brazil, located in Florianópolis, Santa Catarina state, offered an excellent opportunity for running controlled release experiments in a real open air environment. After three CO2-controlled release experiments run from 2011 up to 2015, PETROBRAS, the national oil company that is sponsoring the project, has launched a new challenge. The company stimulated the implementation of a new Brazilian experimental site located in a geologically more complex conditions and more challenging from a technological point of view. The choice of an area inside PUCRS campus, in Viamão Rio Grande do Sul state, was motivated by a predominantly clay subsoil and the privileged location of the site in terms of logistics and security, as the project houses high-tech equipments with significant cost. The purpose of this work is to present the results obtained by the geoelectrical remote time lapse using 3D electrical imaging technique to the monitoring of CO2 migration in both saturated and unsaturated clay-rich sediments in Viamão site, which is lithologically different from the Florianópolis field lab, composed of sandrich sediments. The CO2-controlled release occurred in 2016, covering an subsurface area of approximately 2.925 m. The CO2 was continuously injected through an injection well, at 3 m deep, in a period of 31 days (24 hours/day), at a rate ranging from 5 to 20 kg / day, totalizing 346 kg of injected CO2. While the CO2 was been injected, 3D electrical images using dipole-dipole array, were acquired in a daily base, totalizing 46 consecutive days (including periods before and after injection have been suspended). 3D (tridimensional) and 4D (time-lapsed) electrical imaging produced images up to 17 m below the surface. Remote monitoring has been used for the continuous characterization of the soil/sediment geoelectric responses, significantly increasing the accuracy with respect to the external effects that interfere in the geoelectric responses, such as excessive precipitation and changes in the injection rate. Comparison of post-injection electrical imaging results with pre-injection images","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116444365","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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