Geophysics

Biondi B.L.'s 3-D seismic imaging PDF

By Biondi B.L.

Seismic photographs are an important to contemporary exploration and reservoir tracking. '3D Seismic Imaging offers primary techniques and state of the art tools for imaging mirrored image seismic information. The e-book coherently offers the most parts of seismic imaging - data-acquisition geometry, migration, and pace estimation - by means of exposing the hyperlinks that intertwine them. The ebook emphasizes graphical knowing over theoretical improvement. a number of artificial and box info examples illustrate the presentation of mathematical algorithms. the amount features a DVD that incorporates a subset (C3-narrow-azimuth vintage info set) of the SEG-EAGE salt information set and of the corresponding pace version. The DVD additionally encompasses a entire set of PDF slides that may be used to educate the cloth offered within the publication.

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On the other hand, the application of a residual NMO after using Deregowski’s and Rocca’s DMO introduces only small errors, if the residual moveout is sufficiently small. DMO is not a simple trace-to-trace transformation as NMO is, but it performs a partial prestack migration of the data by spreading (or summing) energy across the midpoint axes. To derive the constant-velocity DMO spreading surface, we start from the ellipsoid that represents the full prestack-migration spreading surface. In the derivation that follows, which is a generalization to 3-D of the 2-D derivation presented by Hale (1991), DMO is assumed to be applied after NMO.

Vermeer, G. J. , 1998, 3-D symmetric sampling: Geophysics, 63, no. 05, 1629–1647. Chapter 2 Full prestack migration by Kirchhoff’s methods The ultimate goal of recording seismic data is to recover an image of the geological structure in the subsurface. Imaging is the most computationally demanding and data-intensive component of seismic processing. Therefore, considerable effort has been spent in devising effective imaging strategies that yield accurate images but are computationally affordable.

3) where xyξ = xξ , yξ represents the horizontal projection of the image-coordinates vector. 1) with a finite sum. 1) as Wi (ξ , mi , hi ) D [t = t D (ξ , mi , hi ) , mi , hi ] . 4) i∈ ξ The subscript i in the equation above reminds us that we record a finite number of data traces and that trace locations are defined on a discrete, though irregular, spatial grid. 4) is seldom important for producing a structural image, but it is crucial when reflection amplitudes are used to determine the relative strengths of the reflectors and to estimate petrophysical parameters in the subsurface.

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3-D seismic imaging by Biondi B.L.


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