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    Numerical modeling of seismic and displacement-based monitoring for the EGS Collab project
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    Seismic physical model technique is important tool of seismic exploration and its experimental level,precision and effects are key of the tool.Selecting two geologic models:dome model with homogeneous overlying medium and dome and fault model with overlying fractured formation,over which a ordinary 3 D seismic data acquisition,processing and analysis have been done and following results are obtained:① seismic physical model experiment can fully model 3 D geologic structural body;② wavefield feature of each geologic body can be reflected on section;③ modeling precision can meet the needs of seismic exploration.
    Seismic to simulation
    Section (typography)
    Dome (geology)
    Synthetic seismogram
    Citations (2)
    Summary The characterization of geothermal reservoirs is primarily based on seismic imaging techniques. In most cases the underlying physics of seismic wave propagation relies on an isotropic acoustic or elastic approximation. In this study we investigate the effect of elastic anisotropy on the depth estimation of geothermal target horizons in seismic images. Realistic values for Tilted Transverse Isotropy (TTI) anisotropic elastic models are estimated from in-situ HP/HT laboratory ultrasonic measurements of rock samples from a geothermal reservoir in southern Tuscany (Italy). Seismic imaging by anisotropic Reverse Time Migration of numerical scattering experiments and reflection seismic data from the study area reveal a vertical displacement of up to 500 m for geothermal target layers compared to the isotropic elastic case.
    Seismic anisotropy
    Reflection
    Geophysical Imaging
    Transverse isotropy
    Anelastic attenuation factor
    Vertical seismic profile
    Seismic migration
    The wave equation finite-difference method is used to the synthetic seismic records in the seismic prospecting of shallow high resolution in urban active fault detection.For improving the resolution and prospecting efficiency of the seismic modeling,some suitable finite-difference method,source wavelet,boundery conditions and dispersion elimination method are adopted.The result shows that the seismic modeling can be used to analyse the influence of the stratigraphic thickness and the obliquity,depth and scale of fault on the seismic synthetic common-shot profiles.From comparision this common-shot profiles with the real experimental data,we can approximately determine the location,scale and depth of fault in field work.The method can improve the prospecting efficiency and resolution rate in the shallow seismic prospecting in urban active fault detection.
    Prospecting
    Geophysical Imaging
    Citations (0)
    The shallow high-resolution seismic prospecting is one of the effective and reliable methods in urban active fault detection.For the shallowness of the object stratum,the tiny difference between the seismic attribute of strata and the ambient noise,it is hard to process and interpret seismic data.In this paper,the staggered-grid high-order difference method of one-order elastic wave equations,which are expressed with velocity and stress applying the flux-corrected transport(FCT) method with a perfectly matched layer(PML) Absorbing boundary condition,are used to obtain the synthetic common-shot profile for shallow fault model.The simulated results of fault model show that this method is accurate and distinct.This seismic modeling method is helpful for approximately estimating the location,the depth and the scope of the fault from the synthetic profile during survey,and improving the efficiency of seismic prospecting and the precision and resolution of seismic data processing and interpretation.
    Stratum
    Synthetic seismogram
    Prospecting
    Seismic to simulation
    Geophysical Imaging
    Citations (0)