Pub Date : 1900-01-01DOI: 10.22564/16cisbgf2019.342
D. Diller, P. Richter
Two recent changes in Distributed Acoustic Sensing (DAS) hydraulic fracture and VSP monitoring are, in the authors’ opinions, worthy of the term transformative. Firstly, engineered fibers provide an improvement in DAS acoustic sensitivity of 20 dB or more, and commonly allow detection on the order of thousands of microseismic events per stage in the Wolfcamp Formation of the Permian Basin, USA, and a typical listening distance of 1,000-1,300 meters depending on the definition of listening distance. Secondly, it is no longer necessary to go to the expense and risk of cementing fibers behind casing to get good quality DAS data. Fibers in wirelines that are simply lying inside the casing of a horizontal well, coupled only by gravity and friction, produce good data quality for both DAS acoustic waves and slow strain data. The deployment and use of temporary DAS fibers is far less expensive than that of permanent fibers.
{"title":"Transformative changes in Distributed Acoustic Sensing (DAS) hydraulic fracture and VSP monitoring","authors":"D. Diller, P. Richter","doi":"10.22564/16cisbgf2019.342","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.342","url":null,"abstract":"Two recent changes in Distributed Acoustic Sensing (DAS) hydraulic fracture and VSP monitoring are, in the authors’ opinions, worthy of the term transformative. Firstly, engineered fibers provide an improvement in DAS acoustic sensitivity of 20 dB or more, and commonly allow detection on the order of thousands of microseismic events per stage in the Wolfcamp Formation of the Permian Basin, USA, and a typical listening distance of 1,000-1,300 meters depending on the definition of listening distance. Secondly, it is no longer necessary to go to the expense and risk of cementing fibers behind casing to get good quality DAS data. Fibers in wirelines that are simply lying inside the casing of a horizontal well, coupled only by gravity and friction, produce good data quality for both DAS acoustic waves and slow strain data. The deployment and use of temporary DAS fibers is far less expensive than that of permanent fibers.","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"1 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":"128729937","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: 10.22564/16cisbgf2019.109
Uilli Freitas, Igor L. S. Braga, Pedro Canhaço, Renzo Francia
{"title":"Stochastic seismic anisotropy sequential inversion for geomechanical properties and in-situ stress estimation","authors":"Uilli Freitas, Igor L. S. Braga, Pedro Canhaço, Renzo Francia","doi":"10.22564/16cisbgf2019.109","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.109","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":"129330905","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: 10.22564/16cisbgf2019.338
Gilberto Lima, E. Urasaki, A. Triques, F. Apolônio, Ana C.L. Azedias, Nathalia Soares da Cruz, J. Cruz
{"title":"Influência do sentido de detonação da Fonte no piloto 4D Nodes do Campo de Lula","authors":"Gilberto Lima, E. Urasaki, A. Triques, F. Apolônio, Ana C.L. Azedias, Nathalia Soares da Cruz, J. Cruz","doi":"10.22564/16cisbgf2019.338","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.338","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":"127546961","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: 10.22564/16cisbgf2019.220
D. Pérez, L. Hardanto
{"title":"Use of Electrofacies, Spectral Decomposition and Neural Network seismic inversion technique to analyze a fluvial channel system, Browse Basin, Western Australia","authors":"D. Pérez, L. Hardanto","doi":"10.22564/16cisbgf2019.220","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.220","url":null,"abstract":"","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"30 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":"126997188","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: 10.22564/16cisbgf2019.101
A. Reis, J. Costa
{"title":"CSEM Forward and Adjoint Modeling Using Correspondence Principle","authors":"A. Reis, J. Costa","doi":"10.22564/16cisbgf2019.101","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.101","url":null,"abstract":"","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":"130755192","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: 10.22564/16cisbgf2019.343
C. Déplanté, Mylla Spirandelli da Costa, M. R. D. Santos, R. S. Dias, V. Mello, Bruno Meirelles, Silvan Silva de Araujo, Dorotéa Vilanova Garcia, R. Sansonowsk
In the scope of the development of the MERO (Libra NW) project, Libra Joint Project Team and Petrobras are preparing a project of 4D acquisition on MERO based on a permanent reservoir monitoring (PRM) network to be installed at the seabed in early production phase (less than 2 years after first oil). With more than 6500 4C stations planned, such a pre-salt PRM is a novel and ambitious project, the first of its kind in a pre-salt setting. Pre-salt 4D signal is weak and 4D repeatability noise in particular can be affected by complex salt propagation effects. Considering these challenges, the costs and reservoir stakes of the project, an extensive full wave acoustic and elastic 4D seismic modeling program has been designed to study geometric repeatability issues as well as prepare future estimation of gas-sensitive 4D attributes and integrate 4D workflow. Preliminary results are discussed Introduction Libra pre-salt field, located in Santos basin, contains large resources to be produced over more than two decades, over a relatively compact area a priori favorable to a PRM setup. Pre-salt reservoirs contains distinct carbonate rocks – stromatolites, grainstones and coquinas, all from Aptian age. Reservoirs are thick yet interspersed with igneous rock. Overall, the reservoir units exhibit four orders of magnitude of permeability variations. A key challenge is the very high GOR in Libra NW, with a CO2-rich gas that poses a great challenge for exporting the HC gas due to restricted economic conditions. A first Extended Well Test already proved excellent pressure communication but its matching reinforced the role of potentially extended multi-darcyan layers, a potential pathways for early gas breakthroughs and a challenge for gas management. Gas capacity will therefore be the main bottleneck to production and efficient gas management key to project NPV. The motivations for investing in a frequenct high density/high repeatability 4D scheme on Libra, stems from the anticipated added value of 4D information to directly assist a production drive, based on WAG alternating water and gas reinjection perhaps combined with other mechanisms. An important aspect of Libra reservoir management is the flexibility of drive obtained using Intelligent Completions Valves (ICVs) with two to three independent levels on injectors and producers. On the 4D side, this implies that on top of the conventional added value of 4D associated to second wave or infill drilling, the vision of fluid fronts via high quality 4D seismic would also be a key enabler to a more efficient reservoir management via better reservoir understanding and more proactive use of ICVs, with the main objective of preventing or delaying early gas breakthroughs. But one needs to see gas fronts. 4D signal is not bound by 3D resolution that is solely dependent on useful signal bandwidth: it is equally modulated by 4D noise. It can detect very subtle dynamic features, on condition of being above 4D noise, that i
{"title":"Using full wave seismic modeling to test 4D repeatability for Libra pre-salt field","authors":"C. Déplanté, Mylla Spirandelli da Costa, M. R. D. Santos, R. S. Dias, V. Mello, Bruno Meirelles, Silvan Silva de Araujo, Dorotéa Vilanova Garcia, R. Sansonowsk","doi":"10.22564/16cisbgf2019.343","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.343","url":null,"abstract":"In the scope of the development of the MERO (Libra NW) project, Libra Joint Project Team and Petrobras are preparing a project of 4D acquisition on MERO based on a permanent reservoir monitoring (PRM) network to be installed at the seabed in early production phase (less than 2 years after first oil). With more than 6500 4C stations planned, such a pre-salt PRM is a novel and ambitious project, the first of its kind in a pre-salt setting. Pre-salt 4D signal is weak and 4D repeatability noise in particular can be affected by complex salt propagation effects. Considering these challenges, the costs and reservoir stakes of the project, an extensive full wave acoustic and elastic 4D seismic modeling program has been designed to study geometric repeatability issues as well as prepare future estimation of gas-sensitive 4D attributes and integrate 4D workflow. Preliminary results are discussed Introduction Libra pre-salt field, located in Santos basin, contains large resources to be produced over more than two decades, over a relatively compact area a priori favorable to a PRM setup. Pre-salt reservoirs contains distinct carbonate rocks – stromatolites, grainstones and coquinas, all from Aptian age. Reservoirs are thick yet interspersed with igneous rock. Overall, the reservoir units exhibit four orders of magnitude of permeability variations. A key challenge is the very high GOR in Libra NW, with a CO2-rich gas that poses a great challenge for exporting the HC gas due to restricted economic conditions. A first Extended Well Test already proved excellent pressure communication but its matching reinforced the role of potentially extended multi-darcyan layers, a potential pathways for early gas breakthroughs and a challenge for gas management. Gas capacity will therefore be the main bottleneck to production and efficient gas management key to project NPV. The motivations for investing in a frequenct high density/high repeatability 4D scheme on Libra, stems from the anticipated added value of 4D information to directly assist a production drive, based on WAG alternating water and gas reinjection perhaps combined with other mechanisms. An important aspect of Libra reservoir management is the flexibility of drive obtained using Intelligent Completions Valves (ICVs) with two to three independent levels on injectors and producers. On the 4D side, this implies that on top of the conventional added value of 4D associated to second wave or infill drilling, the vision of fluid fronts via high quality 4D seismic would also be a key enabler to a more efficient reservoir management via better reservoir understanding and more proactive use of ICVs, with the main objective of preventing or delaying early gas breakthroughs. But one needs to see gas fronts. 4D signal is not bound by 3D resolution that is solely dependent on useful signal bandwidth: it is equally modulated by 4D noise. It can detect very subtle dynamic features, on condition of being above 4D noise, that i","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"141 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":"129200993","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: 10.22564/16cisbgf2019.201
R. Santos, Jose Ricardo Bastos, E. Alves, Marcelo Alvarenga
{"title":"Seismic Data Qualifying for Fracture Detection Along E&P Interpretation Processes","authors":"R. Santos, Jose Ricardo Bastos, E. Alves, Marcelo Alvarenga","doi":"10.22564/16cisbgf2019.201","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.201","url":null,"abstract":"","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"11 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":"125488274","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: 10.22564/16cisbgf2019.292
Lucas Carvalho, A. Carrasquilla
{"title":"Sonic log simulations in wells of Campos and Santos Basins using Gardner, multiple linear regression, geological differential method and artificial intelligence approaches","authors":"Lucas Carvalho, A. Carrasquilla","doi":"10.22564/16cisbgf2019.292","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.292","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":"126686460","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: 10.22564/16cisbgf2019.026
M. Redaelli, R. Victor, C. Beneduzi, Pablo Batista
Shear sonic wave velocities can be obtained by monopole sources in logging tools only for fast formations, namely where formation shear velocity is higher than wave velocity in the drilling mud. The dipole source is used for estimating shear velocity in slow formations, by indirectly processing the flexural mode excited in the borehole. The dispersive characteristic of the flexural mode, nevertheless, renders useless the Slowness-Time Coherence method, the traditional algorithm used for processing non-dispersive sonic waveforms from monopole sources. We report the application of Dispersive Slowness-Time Coherence to process sonic log waveforms acquired using dipole sources. This method uses modeled dispersive curves created from classic wave propagation theory and can overcome the previously mentioned limitations. We tested our implementation using real data from four wells drilled in formations with distinct elastic characteristics and found our results compatible to the ones offered by service companies.
{"title":"Algorithm for processing dispersive waves from dipole sonic tool","authors":"M. Redaelli, R. Victor, C. Beneduzi, Pablo Batista","doi":"10.22564/16cisbgf2019.026","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.026","url":null,"abstract":"Shear sonic wave velocities can be obtained by monopole sources in logging tools only for fast formations, namely where formation shear velocity is higher than wave velocity in the drilling mud. The dipole source is used for estimating shear velocity in slow formations, by indirectly processing the flexural mode excited in the borehole. The dispersive characteristic of the flexural mode, nevertheless, renders useless the Slowness-Time Coherence method, the traditional algorithm used for processing non-dispersive sonic waveforms from monopole sources. We report the application of Dispersive Slowness-Time Coherence to process sonic log waveforms acquired using dipole sources. This method uses modeled dispersive curves created from classic wave propagation theory and can overcome the previously mentioned limitations. We tested our implementation using real data from four wells drilled in formations with distinct elastic characteristics and found our results compatible to the ones offered by service companies.","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"189 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":"123209281","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: 10.22564/16cisbgf2019.328
M. Henriques, G. Corso, J. Freitas, F. Moura, L. Lucena
{"title":"The acoustic 2-D wave equation in multi-scale transform domains","authors":"M. Henriques, G. Corso, J. Freitas, F. Moura, L. Lucena","doi":"10.22564/16cisbgf2019.328","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.328","url":null,"abstract":"","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"93 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":"126206038","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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