SEG Technical Program Expanded Abstracts 2018最新文献_第9页

Geoelectrical investigation of the root-soil interaction 根-土相互作用的地电学研究

SEG Technical Program Expanded Abstracts 2018 Pub Date : 2018-08-27 DOI: 10.1190/SEGAM2018-2998470.1

L. Peruzzo, C. Chou, Yuxin Wu, B. Riley, P. Petrov, G. Newman, B. Dafflon, Eoin L. Brodie, S. Hubbard, E. Blancaflor, Xue‐Feng Ma, R. Versteeg, M. Schmutz

引用次数: 0

Random noise attenuation based on residual learning of deep convolutional neural network 基于残差学习的深度卷积神经网络随机噪声抑制

SEG Technical Program Expanded Abstracts 2018 Pub Date : 2018-08-27 DOI: 10.1190/SEGAM2018-2985176.1

Xu Si, Yijun Yuan

引用次数: 20

Dynamic elasticity and the controlling physical properties of New Zealand’s coaly source rocks 新西兰煤源岩动态弹性及控制物性

SEG Technical Program Expanded Abstracts 2018 Pub Date : 2018-08-27 DOI: 10.1190/SEGAM2018-2969608.1

Stephen Brennan, L. Adam, L. Strachan

引用次数: 1

Data-oriented strategy and Vp/Vs model-constraint for simultaneous Vp and Vs reconstruction in 3D viscoelastic FWI: Application to the SEAM II Foothill dataset 三维粘弹性FWI同时重建Vp和Vs的数据导向策略和Vp/Vs模型约束:在SEAM II Foothill数据集上的应用

SEG Technical Program Expanded Abstracts 2018 Pub Date : 2018-08-27 DOI: 10.1190/SEGAM2018-2997555.1

P. Trinh, R. Brossier, L. Métivier, J. Virieux

{"title":"Data-oriented strategy and Vp/Vs model-constraint for simultaneous Vp and Vs reconstruction in 3D viscoelastic FWI: Application to the SEAM II Foothill dataset","authors":"P. Trinh, R. Brossier, L. Métivier, J. Virieux","doi":"10.1190/SEGAM2018-2997555.1","DOIUrl":"https://doi.org/10.1190/SEGAM2018-2997555.1","url":null,"abstract":"Full waveform inversion (FWI) of onshore targets is very challenging due to the complex free-surface-related effects and 3D geometry representation. In such areas, the seismic wavefield is dominated by highly energetic and dispersive surface waves, converted waves and back-scattering energy. We use a timedomain spectral-element-based approach for elastic wavefield simulation in foothill areas. The challenges of the elastic multiparameter FWI in complex land areas are highlighted through the inversion of the pseudo-2D dip-line survey of the SEAM Phase II Foothill dataset. As the data is dominated by surface waves, it is mainly sensitive to the S-wave velocity. We then propose a two-steps data-windowing hierarchy to simultaneously invert for Pand S-wave speeds, focusing on early body waves before considering the whole data. By doing so, we aim at exploiting the maximum amount of information in the observed data and getting a reliable model parameters estimation, both in the near-surface and in deeper part. The model constraint that we introduce on the ratio of compressional and shear velocities also plays an important role to mitigate the ill-posedness of the inversion process.","PeriodicalId":158800,"journal":{"name":"SEG Technical Program Expanded Abstracts 2018","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131135779","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: 4

Induced-polarization measurements of sandstones under elevated pressure 高压下砂岩的诱导极化测量

SEG Technical Program Expanded Abstracts 2018 Pub Date : 2018-08-27 DOI: 10.1190/SEGAM2018-2998354.1

C. Mapeli, L. Ou, M. Prasad

引用次数: 1

Multiscenario, multirealization seismic inversion for probabilistic seismic reservoir characterization 概率地震储层表征的多场景、多实现地震反演

SEG Technical Program Expanded Abstracts 2018 Pub Date : 2018-08-27 DOI: 10.1190/SEGAM2018-2992162.1

K. Waters, M. Kemper

引用次数: 0

Seismic facies in the Pearl River Submarine Canyon, northern South China Sea 南海北部珠江海底峡谷地震相研究

SEG Technical Program Expanded Abstracts 2018 Pub Date : 2018-08-27 DOI: 10.1190/SEGAM2018-2998482.1

Ke Huang, G. Zhong, Liao-liang Wang, Yiqun Guo

引用次数: 0

Implementing internal interfaces in finite-difference schemes with the Heaviside step function 用Heaviside阶跃函数实现有限差分格式的内部接口

SEG Technical Program Expanded Abstracts 2018 Pub Date : 2018-08-27 DOI: 10.1190/SEGAM2018-2994775.1

R. Mittet

{"title":"Implementing internal interfaces in finite-difference schemes with the Heaviside step function","authors":"R. Mittet","doi":"10.1190/SEGAM2018-2994775.1","DOIUrl":"https://doi.org/10.1190/SEGAM2018-2994775.1","url":null,"abstract":"Implementing sharp internal interfaces in finite-difference schemes with high spatial accuracy is challenging. The implementations of interfaces are generally considered accurate to at best second order. The natural way to describe an abrupt change in material parameters is by the use of the Heaviside step function. However, the implementation of the Heaviside step function must be consistent with the discrete sampling on the finite-difference grid. Assuming that the step function takes on the value zero up to some node location and then unity from thereon results in an incorrect wavenumber representation of the Heaviside step function so this representation must be incorrect. However, starting with the proper wavenumber representation of the Heaviside step function and then transforming this spectrum to the space domain give much better accuracy. The interface location appears as a proportionality factor in the phase in the wavenumber domain and can be altered continuously. Thus, the interface can be located anywhere between two node locations. This is a key factor for avoiding stair-case effects from the fields when doing 2D and 3D finite-difference simulations. The proposed method can be used for all systems of partial differential equations that formally can be expressed as a material parameter times a dynamic field on one side of the equal sign and with spatial derivatives on the other side of the equal sign. For geophysical simulations the most important cases will be the Maxwell equations and the acoustic and elastic wave equations.","PeriodicalId":158800,"journal":{"name":"SEG Technical Program Expanded Abstracts 2018","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133464508","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

Deep-learning seismic facies on state-of-the-art CNN architectures 在最先进的CNN架构上深度学习地震相

SEG Technical Program Expanded Abstracts 2018 Pub Date : 2018-08-27 DOI: 10.1190/SEGAM2018-2996783.1

J. Dramsch, M. Lüthje

引用次数: 74

Application of crosscorrelation of angle stacks for velocity quality control in seismic imaging 角叠互相关在地震成像速度质量控制中的应用

SEG Technical Program Expanded Abstracts 2018 Pub Date : 2018-08-27 DOI: 10.1190/SEGAM2018-2995563.1

A. Willis, P. Busono

引用次数: 0