Pub Date : 1900-01-01DOI: 10.22564/16cisbgf2019.359
F. Marpeau, V. Belz
{"title":"Status of salt interpretation for velocity model building in Brazilian basins","authors":"F. Marpeau, V. Belz","doi":"10.22564/16cisbgf2019.359","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.359","url":null,"abstract":"","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"45 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":"116459415","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: 10.22564/16cisbgf2019.150
A. Camargo, J. Ribeiro, T. Coimbra, G. Ignácio, M. Tygel
The estimation of geophysical attributes for a better understanding of subsurface geological structures is essential in many stages of seismic exploration and production. As a powerful seismic inversion tool, the full waveform inversion (FWI) has been widely used to estimate many of such attributes (e.g., seismic velocities) with high resolution. In many cases, however, real acquisitions are unable to provide the quantity and density of traces required for optimal inversion results. As a consequence, schemes to produce (simulate) new traces by interpolation/extrapolation of neighboring available traces, play a crucial role. In this paper, we use the offset-continuation-trajectory (OCT) stacking method to generate new (non-recorded) traces and include them in an ocean-bottom node (OBN) acquisition. We next test the FWI inversion on the enhanced dataset and analyze the results. As proof-of-concept, our approach is applied to the synthetic dataset obtained for an OBN acquisition carried out on the 2D Marmousi model for which several additional traces, simulated by the OCT procedure, have been included. In spite of the recognized complexities of the Marmousi model, we have obtained very encouraging results.
{"title":"Full-wave inversion (FWI) to a 2D-ocean-bottom node (OBN) dataset after offset-continuation-trajectory (OCT) data regularization","authors":"A. Camargo, J. Ribeiro, T. Coimbra, G. Ignácio, M. Tygel","doi":"10.22564/16cisbgf2019.150","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.150","url":null,"abstract":"The estimation of geophysical attributes for a better understanding of subsurface geological structures is essential in many stages of seismic exploration and production. As a powerful seismic inversion tool, the full waveform inversion (FWI) has been widely used to estimate many of such attributes (e.g., seismic velocities) with high resolution. In many cases, however, real acquisitions are unable to provide the quantity and density of traces required for optimal inversion results. As a consequence, schemes to produce (simulate) new traces by interpolation/extrapolation of neighboring available traces, play a crucial role. In this paper, we use the offset-continuation-trajectory (OCT) stacking method to generate new (non-recorded) traces and include them in an ocean-bottom node (OBN) acquisition. We next test the FWI inversion on the enhanced dataset and analyze the results. As proof-of-concept, our approach is applied to the synthetic dataset obtained for an OBN acquisition carried out on the 2D Marmousi model for which several additional traces, simulated by the OCT procedure, have been included. In spite of the recognized complexities of the Marmousi model, we have obtained very encouraging results.","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"10 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":"122661877","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: 10.22564/16cisbgf2019.163
Rafael Siqueira, Leandro Di Bartolo, B. Souza
{"title":"Um Tutorial de Implementação da FWI e Avaliação da Influência do Uso da Diagonal da Pseudo-Hessiana","authors":"Rafael Siqueira, Leandro Di Bartolo, B. Souza","doi":"10.22564/16cisbgf2019.163","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.163","url":null,"abstract":"","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"42 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":"124225614","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: 10.22564/16cisbgf2019.120
Gabriela Serejo de Oliveira, J. Porsani, M. Couto
{"title":"Modeling HTEM Data Anomalies for Mineral Exploration in the Quadrilatero Ferrifero","authors":"Gabriela Serejo de Oliveira, J. Porsani, M. Couto","doi":"10.22564/16cisbgf2019.120","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.120","url":null,"abstract":"","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"297 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":"121100630","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: 10.22564/16cisbgf2019.232
Moara de Matos, W. R. Borges, V. Pinto, Ciro Calachibete, Maria Clara Lopes Paula, I. Almeida
{"title":"Resitividade Elétrica Aplicada à Mineralizações Manganesíferas em Castanheira, MT","authors":"Moara de Matos, W. R. Borges, V. Pinto, Ciro Calachibete, Maria Clara Lopes Paula, I. Almeida","doi":"10.22564/16cisbgf2019.232","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.232","url":null,"abstract":"","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"191 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":"114209256","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: 10.22564/16cisbgf2019.197
B. C. Araújo, Maria da Gama, Flávio Junior, Tatiane do Nascimento, Luis Fernando da Silva, Guilherme dos Santos, L. Borghi, M. A. Braga, J. Figueiredo
{"title":"Refining Structural Interpretation by Using the Composite Map of the Vertical Derivatives of Aeromagnetic Anomaly Data","authors":"B. C. Araújo, Maria da Gama, Flávio Junior, Tatiane do Nascimento, Luis Fernando da Silva, Guilherme dos Santos, L. Borghi, M. A. Braga, J. Figueiredo","doi":"10.22564/16cisbgf2019.197","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.197","url":null,"abstract":"","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"45 6-7 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":"116507657","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: 10.22564/16cisbgf2019.142.143
S. Guimarães, F. P. Vieira, V. Hamza
{"title":"Thermomagnetic Features of Central Brazil, between regions of Trans-Brazilian Lineament (TBL) and São Francisco Craton (SFC)","authors":"S. Guimarães, F. P. Vieira, V. Hamza","doi":"10.22564/16cisbgf2019.142.143","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.142.143","url":null,"abstract":"","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"194 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":"121467708","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: 10.22564/16cisbgf2019.076
G. Soares, K. Pinheiro, J. Matzka, A. Morschhauser, Cristiano Martins
{"title":"Brazilian geomagnetic observatories - recent improvements and data availability","authors":"G. Soares, K. Pinheiro, J. Matzka, A. Morschhauser, Cristiano Martins","doi":"10.22564/16cisbgf2019.076","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.076","url":null,"abstract":"","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"26 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":"114798641","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: 10.22564/16cisbgf2019.294
Grazielle Oliveira, M. Ceia, R. Misságia, I. L. Neto, V. Santos
{"title":"The influence of microporosity on porosity-permeability correlation in carbonate rocks","authors":"Grazielle Oliveira, M. Ceia, R. Misságia, I. L. Neto, V. Santos","doi":"10.22564/16cisbgf2019.294","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.294","url":null,"abstract":"","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"40 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":"114863139","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: 10.22564/16cisbgf2019.255
M. M. Zago, Maximilian Fries, I. Clemente, A. Nummer, R. Pinheiro
Geophysics is widely recognized tool in indirect subsurface and non-invasive investigation. It is applied in different near-surface and geotechnical studies. As an example, we can mention ground investigations for structures, cables, fractures, cavities and water infiltration. In geotechnics, lithologies heterogeneities, fault/joints and basement rocks soil (altered zone) investigations have been producing significant results with low costs, less time and simple logistics. This study proposes the use of direct current resistivity profiles to detect and characterize altered rocks layers limits (regolith), water saturated areas and depth as an auxiliary aid to characterize a collapsed asphalt paved road (ERS-149). The area is located between Faxinal do Soturno and Nova Palma cities, Rio Grande do Sul State, Brazil. Locally, on the road side, several cracks occurred due the ground instability leading to an asphalt and material below collapse. We performed two DC-resistivity profiles perpendicular to the road integrated with a high-resolution digital elevation model. The results presented a large amount of unconsolidated material (soil and rocks fragments) and a significant inpore water filling zones. These features, associated with the gravitational action in the area are interpreted as the main sliding, cracking and collapsing causes. The use of geophysics in this context was a valuable and effective method as an aid to conduct and locate direct subsurface investigations as detail geological and soil mapping and drill-holes to better describes the lithology/materials refining the subsurface modeling.
{"title":"Fissuras no pavimento da rodovia ERS-149 - Geofísica aplicada como auxílio na caracterização do terreno","authors":"M. M. Zago, Maximilian Fries, I. Clemente, A. Nummer, R. Pinheiro","doi":"10.22564/16cisbgf2019.255","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.255","url":null,"abstract":"Geophysics is widely recognized tool in indirect subsurface and non-invasive investigation. It is applied in different near-surface and geotechnical studies. As an example, we can mention ground investigations for structures, cables, fractures, cavities and water infiltration. In geotechnics, lithologies heterogeneities, fault/joints and basement rocks soil (altered zone) investigations have been producing significant results with low costs, less time and simple logistics. This study proposes the use of direct current resistivity profiles to detect and characterize altered rocks layers limits (regolith), water saturated areas and depth as an auxiliary aid to characterize a collapsed asphalt paved road (ERS-149). The area is located between Faxinal do Soturno and Nova Palma cities, Rio Grande do Sul State, Brazil. Locally, on the road side, several cracks occurred due the ground instability leading to an asphalt and material below collapse. We performed two DC-resistivity profiles perpendicular to the road integrated with a high-resolution digital elevation model. The results presented a large amount of unconsolidated material (soil and rocks fragments) and a significant inpore water filling zones. These features, associated with the gravitational action in the area are interpreted as the main sliding, cracking and collapsing causes. The use of geophysics in this context was a valuable and effective method as an aid to conduct and locate direct subsurface investigations as detail geological and soil mapping and drill-holes to better describes the lithology/materials refining the subsurface modeling.","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"53 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":"124507608","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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