Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef最新文献_第3页

Updating velocity models for complex pre-salt targets in Santos basin 桑托斯盆地复杂盐下目标速度模型更新

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.164

Sergio Barragan, D. Donno, F. Jouno, Adriano Martinez, A. Khalil

{"title":"Updating velocity models for complex pre-salt targets in Santos basin","authors":"Sergio Barragan, D. Donno, F. Jouno, Adriano Martinez, A. Khalil","doi":"10.22564/16cisbgf2019.164","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.164","url":null,"abstract":"Pre-salt oil discoveries in the Santos basin have made it one of the most prospective petroleum provinces in the world. The prospects that these plays provide are not without challenge. Complex geological features and deep targets complicate the exploration and evaluation process. Limited illumination of available narrow-azimuth (NAZ) seismic data further add to the challenge. Full waveform inversion (FWI) is a natural choice to update complex overburdens. The recently proposed formulation by Zhang et al. (2018) provides a reliable approach for the complex geologies of the Santos basin. For deeper updates, waveequation migration velocity analysis (WEMVA) relies on reflections through the wave-equation, making it a potential candidate for salt and pre-salt model updates. While still susceptible to the limitations imposed by NAZ data, Donno et al. (2019) introduced a regularization to reduce some of these adverse effects. Iterating these two flavors of waveequation based inversions, we demonstrate that reasonable velocity updates can be achieved in some of the complex areas of the Santos basin using NAZ data. Salt delineation and scenario testing are still required in some places to improve unresolved areas. Results are promising with a significant uplift in the pre-salt layer.","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"14 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":"124097713","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}

引用次数: 1

Interpretation of geoelectric surveys using synthetic models and its application for study of groundwater resources in semiarid regions of Minas Gerais, Brazil 巴西米纳斯吉拉斯州半干旱区地下水资源综合模型地电测量解释及其应用

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.264

J. L. Gomes, V. Hamza, F. P. Vieira

引用次数: 2

Rejuvenation of seismic data in Santos and Campos Basins with Full Waveform Inversion and high-resolution imaging 利用全波形反演和高分辨率成像技术恢复Santos和Campos盆地的地震数据

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.357

A. Alcudia-Leon, A. Sosa, S. Arasanipalai, B. Virlouvet, H. Lebit

引用次数: 0

Processamento Inicial de dados Magnetotelúricos na região da bacia sedimentar Tucano central_ Análise Preliminar 图卡诺中部沉积盆地磁大地资料的初步处理-初步分析

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.123

P. Santos, Andrea Santos-Matos, A. Padilha, Marcelo B. Pádua

引用次数: 0

Gravimetric and seismic stratigraphy studies applied to Barra Fault System, limit region between Recôncavo and Camamu basins, Bahia, Brazil 巴西巴伊亚州Recôncavo与Camamu盆地交界地带Barra断裂系重力与地震地层学研究

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.188

R. Rigaud, D. Vilas-Boas, J. Batista

引用次数: 0

Improving pre-salt targets using wave-equation velocity analysis 利用波动方程速度分析改进盐下目标

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.154

D. Donno, Sergio Barragan, F. Jouno, A. Khalil

{"title":"Improving pre-salt targets using wave-equation velocity analysis","authors":"D. Donno, Sergio Barragan, F. Jouno, A. Khalil","doi":"10.22564/16cisbgf2019.154","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.154","url":null,"abstract":"Despite continuous improvements in model-building technologies, imaging below salt remains challenging. Reflection full-waveform inversion (RFWI) is effective at providing low-wavenumber velocity updates beyond the penetration depth of diving waves, however it is still susceptible to amplitude mismatch between input and modeled data. It also suffers from limitations imposed by narrow-azimuth (NAZ) seismic acquisition. To reduce the adverse impact of amplitude differences between input and modeled data, we present here a stack-power waveequation migration velocity analysis (WEMVA) method. Differently than RFWI, this method uses an objective function defined in the image domain. Therefore, it depends more on the kinematic part of the propagated wavefields, resulting in a more reliable inversion scheme. We also introduce a regularization term that reduces the footprints created in the velocity updates by NAZ seismic data. We demonstrate the effectiveness of this method by using synthetic and field data with NAZ acquisition geometries. Finally, we discuss some of its limitations, and suggest ideas for further improvements.","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"29 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":"131704740","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}

引用次数: 1

Airborne gamma-ray spectrometry signatures of Ediacaran granitic rocks in the Transversal Zone of Borborema Province - NE-Brazil 巴西东北部borborrema省横断带埃迪卡拉纪花岗质岩石的航空伽玛能谱特征

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.025

F. Sousa, A. Silva, Catarina Labouré Bemfica Toledo

引用次数: 0

A Two-Phase Approach for Full Waveform Inversion using Constrained Optimization 基于约束优化的全波形两相反演方法

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.019

A. Camargo, L. T. Santos

引用次数: 0

Prospecção de minerais pesados em placeres no litoral Sul do Rio Grande do Norte (RN) - método aeroradiométrico e concentrado de bateia 大北(RN)南海岸砂砾重矿物勘探-空气辐射法和bateia精矿

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.367

Matheus Dias Oliveira, Asmminey Ariane da Silva Nascimento, Vanildo Fonseca Pereira, Alexandre Magno Rocha da Rocha

引用次数: 0

Comparative Analysis of Lineaments of the Western Portion of the State of Roraima from Aeromagnetometric Data, SRTM and R99 SAR 罗赖马州西部航磁资料、SRTM和R99 SAR的地形特征对比分析

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.085

P. Oliveira, S. Costa, J. A. P. D. Costa

引用次数: 0