Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef最新文献_第9页

Aplicação de técnicas de processamento de dados GPR para delimitação de infiltração de água em vazamento de tubulação em via urbana 探地雷达数据处理技术在界定城市道路漏水管道渗水中的应用

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.054

M. taniyama, João Andrade dos Reis Júnior, G. Duarte, D. Miranda

引用次数: 0

Statistics on the accuracy of the geographic north calculation as a function of solar ecliptic parameters 地理北极点计算精度随太阳黄道参数变化的统计

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.331

Natacha Santos, C. F. Ponte-Neto, A. Wiermann

引用次数: 0

Multiple attenuation techniques on OBC survey in Campos basin Campos盆地OBC勘探中的多重衰减技术

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.247

P. Barros, M. Ortin, J. Gaeman, Joshua Tunninclife, F. D. Melo, M. Rapini, Antonio Sá, Jorge Logrado

{"title":"Multiple attenuation techniques on OBC survey in Campos basin","authors":"P. Barros, M. Ortin, J. Gaeman, Joshua Tunninclife, F. D. Melo, M. Rapini, Antonio Sá, Jorge Logrado","doi":"10.22564/16cisbgf2019.247","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.247","url":null,"abstract":"Multiple attenuation is one of the biggest challenges in the seismic signal processing workflow in Campos basin. This comes from the seafloor depth variability and multiple reservoir target levels, in both pre-salt and post-salt zones. In this scenario, the main multiples interfere with the primaries, preventing a good reservoir image. The industry standard approach for multiple prediction is the 3D surface related multiple elimination (SRME) with many good implementations on towed streamer data. In Ocean Bottom Seismic (OBS) acquisition, sources are near the surface while the receivers are deployed at the seafloor, giving two different datums in the process. This dual datum poses a problem to the use of this technique direct from the OBS data. To overcome this, the traces necessary to the prediction with SRME in the OBS data are obtained from a towed streamer data in the same area. Another effective demultiple technique is the one based on the source-side wavefield propagation of the water layer to model the related multiples as described by Kostov et al. (2015) with the Generalized Deterministic Water bottom Demultiple (GDWD). Here we show a case study in Campos Basin, offshore Brazil, where towed streamer complements ocean bottom cable (OBC) data to generate a 3D SRME multiple model and then combined with water-layer wavefield propagation model to produce an improved multiple attenuation from shallow to deep water. We look at the models and its adaptive subtraction results. The streamer-OBC 3D SRME shows a reliable multiple model where the towed streamer data coverage matches the OBC’s. Meanwhile, the GDWD produces a complementary model covering most of the previous’ weaknesses resulting in a robust combined model.","PeriodicalId":332941,"journal":{"name":"Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef","volume":"46 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":"124017421","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: 0

Investigação geoelétrica de depósito de barita – resultados preliminares 重晶石矿床地电调查-初步结果

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.228

F. Lasmar, V. Elis

引用次数: 0

Seasonal variation of salinity on the island of Tatuoca and its influence on the vertical component of the geomagnetic field 塔图卡岛盐度的季节变化及其对地磁场垂直分量的影响

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.334

S. Laranja, P. Buarque, L. Benyosef

引用次数: 0

Predicting, sampling, or optimizing the spatial distribution of petrophysical properties from seismic data 从地震资料中预测、取样或优化岩石物理性质的空间分布

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.105

D. Grana

引用次数: 0

Near-field measurements versus far-field estimations of air gun array sound pressure levels and sound exposure levels for blended source acquisition 混合声源采集中气枪阵列声压级和声暴露级的近场测量与远场估计

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.314

P. Fontana, M. Rocke

引用次数: 1

Preconditioned Reflection Full Waveform Inversion for Subsalt Modeling Building 盐下模拟建筑物的预条件反射全波形反演

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.157

Chao Wang, P. Farmer, David Yngist, J. Brittan, I. Jones, C. Calderón

引用次数: 0

Interbed demultiple using Marchenko redatuming on 3D field data of the Santos basin 利用Marchenko重新数据对Santos盆地的三维现场数据进行互层分解

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.245

M. Staring, C. Wapenaar

{"title":"Interbed demultiple using Marchenko redatuming on 3D field data of the Santos basin","authors":"M. Staring, C. Wapenaar","doi":"10.22564/16cisbgf2019.245","DOIUrl":"https://doi.org/10.22564/16cisbgf2019.245","url":null,"abstract":"We apply Marchenko redatuming using an adaptive double-focusing method to 3D field data of the Santos basin, Brazil. This method was already successfully applied to 2D field data and we now study the acquisition geometry and preprocessing requirements in 3D. We start from 3D synthetic data modeled on a dense grid of colocated sources and receivers and decimate down to a realistic NAZ streamer acquisition. The synthetic tests show that the sail line spacing and the missing outer cables are the acquisition parameters with the strongest effect on Marchenko redatuming. We can interpolate for the sail line spacing and the near offsets, but the missing outer cables are unfortunately a limitation of the acquisition. After applying the proposed interpolation to 3D field data, interbed multiples are successfully predicted and subtracted from the target area, resulting in a significant improvement in the geological interpretation. Naturally, the pre-processing requirements and challenges strongly depend on the acquisition geometry and the geology of the area under investigation (e.g. water depth, shape of the overburden, maximum dip). Hence, these tests only give a general idea about the limitations of 3D Marchenko redatuming","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":"130975977","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: 7

Evaluation of the subsurface of an open dump area in the Amazon region (Pará, Brazil) 亚马逊地区露天排土场地下评价(par<e:1>，巴西)

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef Pub Date : 1900-01-01 DOI: 10.22564/16cisbgf2019.254

M. D. Sousa, P. Oliva

引用次数: 0