Download 3-D seismic imaging by Biondi B.L. PDF

By Biondi B.L.

Seismic photographs are the most important to brand new exploration and reservoir tracking. '3D Seismic Imaging provides basic strategies and state-of-the-art tools for imaging mirrored image seismic information. The ebook coherently offers the most elements of seismic imaging - data-acquisition geometry, migration, and speed estimation - via exposing the hyperlinks that intertwine them. The publication emphasizes graphical realizing over theoretical improvement. numerous man made and box info examples illustrate the presentation of mathematical algorithms. the quantity encompasses a DVD that encompasses a subset (C3-narrow-azimuth vintage facts set) of the SEG-EAGE salt info set and of the corresponding pace version. The DVD additionally incorporates a entire set of PDF slides that may be used to educate the cloth provided within the ebook.

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Sample text

Seis. Soc. , 70, 47–77. Vidale, J. , 1990, Finite-difference calculation of traveltimes in three dimensions: Geophysics, 55, no. 05, 521–526. 42 CHAPTER 2. 16: Migrated in-line section of the SEG-EAGE salt data set with narrow migration apertures in both the in-line and cross-line direction αx = 30◦ and α y = 5◦ . 17: Migrated in-line section of the SEG-EAGE salt data set with a wide migration aperture in the in-line direction and a narrow aperture in the cross-line direction αx = 70◦ and α y = 30◦ .

Cheops-Model-Time-Hyperb-SEG-SALT-1 [NR,M] 39 40 CHAPTER 2. 15: Illustration of the cone-shaped migration aperture for Kirchhoff 3-D prestack migration. 15. The input midpoints that contribute to a single image-point are limited to a circular area centered around the surface location xyξ of the image point. The diameter of this circle is directly proportional to (z ξ × tan α), where α is the aperture of the cone as shown in the figure. 12) that grows in proportion to only the size of the area covered by the image, not in proportion to the area covered by the survey.

However, when choosing between full prestack migration and one of the several cheaper alternatives, a seismologist is often faced with a trade-off between cost and accuracy. For both sides of this trade-off to be understood, it is useful to analyze the computational cost of the different alternatives. 4). 11) where (Nzξ , Nxξ , Nyξ ) are the dimensions of the image space, and (Nxm , Nym , Nf) are the dimensions of the data space, with Nf equal to the nominal fold of the survey. The constant κPreKir in front of the cost function depends on the migration type.

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