Sensitivity of 3D 3C synthetic seismograms to anisotropic attenuation and velocity in reservoir models

Guo, Peng; McMechan, George A.

doi:10.1190/geo2016-0321.1

Cited by 23 publications

(8 citation statements)

References 51 publications

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“…It is used in forward and inverse modelling (e.g. Guo and McMechan, 2017;Mousavi et al, 2017), determination of feasibility of detection of seismic events (e.g. Hallo, 2012;Wüstefeld et al, 2014) as well as interpretation of the medium properties itself.…”

Section: Methodsmentioning

confidence: 99%

Fast determination of attenuation from microseismicity for large datasets

Wcisło¹

2019

Acta Geodynamica Et Geomaterialia

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We develop a robust and automatic determination of peak frequencies of direct wave arrivals from microseismic events using mirror image of the recorded signal. These peak frequencies can be then used to evaluate attenuation quality factor (Q). We propose to use procedure that consists of automatic determination of the peak frequencies in combination with matched filter to facilitate selection of suitable events. Using both natural and induced seismicity datasets, we show that matched filter detection along with automatic determination of the peak frequencies gives consistent values of quality factor when compared with manual processing. Proposed technique significantly reduces processing time making it a suitable tool in attenuation analysis of large datasets.

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Section: Methodsmentioning

confidence: 99%

Fast determination of attenuation from microseismicity for large datasets

Wcisło¹

2019

Acta Geodynamica Et Geomaterialia

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“…Considering the shale's strong anisotropy characteristics, the assumption of the isotropic medium is inappropriate, and the adoption of transversely isotropic media is currently recognized as a more reasonable description of shale media [23,24]. In our study, the calculation of the seismic wavefield is based on the elastic wave equation:…”

Section: Forward Modeling For 3d Tti Modelmentioning

confidence: 99%

Impact of Shale Anisotropy on Seismic Wavefield

Liu

Chang

et al. 2019

Energies

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During unconventional resources exploration, ignoring shale anisotropy may lead to wrong seismic interpretations, thus affecting the accuracy and credibility of sweet spots prediction and reservoir characterization. In order to investigate the impact of shale anisotropy on the seismic wavefield, we propose a quantitative evaluation method by calculating the waveforms’ amplitude and phase deviations. Based on the 3D elastic wave equation and the staggered-grid finite-difference method, the forward modeling theory with the consideration of shale anisotropy is established. Then, we use the envelope misfit (EM) and phase misfit (PM) parameters to illustrate the differences in waveforms’ amplitude and phase morphology, which are caused by anisotropy. Lastly, by comparing the waveforms of the models with/without anisotropy and calculating their EM and PM values, a practical and quantitative evaluation method is constructed. We used synthetic models of different complexity and oilfield models to validate the proposed method. Through the research, we also gained some new insights about the anisotropy’s effects. For a certain medium model, the impact of shale anisotropy on seismic wavefield is complicated and needs specific analysis. The proposed method provides a useful and quantitative tool for the evaluation of shale anisotropy’s impact.

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“…Fluid-filled fractures also cause significant attenuation anisotropy (Liu et al, 2007). Guo and McMechan (2017) conduct full-waveform modeling tests to study the effects of fracture parameters on anisotropic attenuation and suggest that attenuation anisotropy is a potential tool for reservoir characterization. Therefore, the ability to model the wave behavior in the presence of anisotropic attenuation is important for further quantitative reservoir studies.…”

Section: Introductionmentioning

confidence: 99%

Efficient modeling of wave propagation in a vertical transversely isotropic attenuative medium based on fractional Laplacian

Zhu

Bai

2019

GEOPHYSICS

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To efficiently simulate wave propagation in a vertical transversely isotropic (VTI) attenuative medium, we have developed a viscoelastic VTI wave equation based on fractional Laplacian operators under the assumption of weak attenuation ([Formula: see text]), where the frequency-independent [Formula: see text] model is used to mathematically represent seismic attenuation. These operators that are nonlocal in space can be efficiently computed using the Fourier pseudospectral method. We evaluated the accuracy of numerical solutions in a homogeneous transversely isotropic medium by comparing with theoretical predictions and numerical solutions by an existing viscoelastic-anisotropic wave equation based on fractional time derivatives. To accurately handle heterogeneous [Formula: see text], we select several [Formula: see text] values to compute their corresponding fractional Laplacians in the wavenumber domain and interpolate other fractional Laplacians in space. We determined its feasibility by modeling wave propagation in a 2D heterogeneous attenuative VTI medium. We concluded that the new wave equation is able to improve the efficiency of wave simulation in viscoelastic-VTI media by several orders and still maintain accuracy.

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Sensitivity of 3D 3C synthetic seismograms to anisotropic attenuation and velocity in reservoir models

Cited by 23 publications

References 51 publications

Fast determination of attenuation from microseismicity for large datasets

Fast determination of attenuation from microseismicity for large datasets

Impact of Shale Anisotropy on Seismic Wavefield

Efficient modeling of wave propagation in a vertical transversely isotropic attenuative medium based on fractional Laplacian

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