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Showing 1 to 10 of 10 for “"zero offset"”.
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Processing of DAS and geophone VSP data from the CaMI Field Research Station
… around VSP for azimuthal anisotropy analysis, zero offset VSPs to test the emerging DAS technology and walk-away VSP to obtain imaging results for straight and helical wounded fibre optic cables. From the azimuthal analysis, the fast direction was identified to the northeast with an epsilon …
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Multiple suppression in the t-x-p domain
… eventually to the t0-x-p space, where t0 is the zero offset traveltime. Multiplication of the gather in the extended space with Gaussian tapering filters, formed using the difference of the powers of the intrinsically calculated velocities in terms of t0 , x and p using analytical relations and …
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Parametric study of stresses in cooling-tower shells
… hyperbolic axis ratio (bla), top opening angle , offset parameters (A), and scale of the structure are varied one at a time, to investigate the effect these parameters have on the meridional and hoop stresses. A general-pwpose finite element programme, ABAQUS, was used to create models of the …
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Prediction and Measurement of Thermal Exchanges within Pyranometers
… at the detector surface and produces an offset from the signal that would result from the incident shortwave radiation alone. Described is an ongoing effort to model these exchanges and to use experimental results to verify the model. The ultimate goal of the work described is to provide …
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Overcoming Thermal Challenges to Acquire Absolute Pressure Measurements in Rotating Detonation Engines Using Piezoresistive Pressure Transducers
… voltage output and (a) sensor temperature and zero-offset voltage output. The sensor was implemented in recessed configuration into an RDE. Thermal compensation was effective after initial transients subsided, resulting in matching time-varying pressure from both PE and PR transducers. However, …
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Estimating Seismic Anisotropy: Fluid Substitution Theory, 3D-Printed Inclusion Models, and Multi-Component 3D VSP in the Bakken Shale
… Hudson's theory (within 10%). I also processed zero-offset, walk-away and walk-around VSP data in the Bakken shale, North Dakota, provided to us by Hess Corporation. I found that there was strong polar anisotropy in evidence from the VSP data in the Mission Canyon, Lodgepole, and Bakken …
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Characterizing intrinsic and stratigraphic Q in VSP data with information measures
… the aim of discriminating between the two. In a zero-offset vertical seismic profiling (VSP) data set, at any instant in time we have access to a snapshot of the seismic wavefield along the principal direction of wave propagation. In practice, such a snapshot has the form of discrete amplitude …
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A study of the velocity structure in a marine boundary layer : instrumentation and observations
… accuracy of ±.5 cm/sec, referred to an in situ zero point. A complete set of velocity measurements is made every .750 seconds, each measurement being the vector component averaged over 15 cm. The data is internally recorded on digital cassette tape. Eight hours of continuous data can be …
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Modeling Offset-Dependent Reflectivity for Time-Lapse Monitoring of Water-Flood Production in Thin-Layered Reservoirs
… the reflectivity (or amplitude) as a function of offset (AVO) which strongly depends on material properties, and hence, on the pore fluid. Repeat surveys, however, are very costly. To reduce the risks, the repeat survey is simulated on a computer for a number of different scenarios. Hence, the …
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Estimation of seismic parameters from multifold reflection seismic data by generalized linear inversion of Zoeppritz equations
… boundary from P-wave reflection amplitude-versus-offset (AVO) data recorded at the surface. The method has for its basis the inversion of the plane wave Zoeppritz. equations by generalized linear inversion (GLI) and bootstrapping. The Zoeppritz equations are converted into the time-offset domain …