Reservoir geophysics exercises

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Seismic Data Analysis
Series Investigations in Geophysics
Author Öz Yilmaz
ISBN ISBN 978-1-56080-094-1
Store SEG Online Store

Exercise 11-1. Derive equation (2a) for the Fresnel zone using the geometry of Figure 11.1-3.

Exercise 11-2. Refer to Figure 11.4-1a. Consider a surface multiple from the first reflecting interface. Trace the traveltime on the VSP diagram in Figure 11.4-1b. Multiples do not reach the downgoing wave path; thus, they can be eliminated by corridor stacking.

Exercise 11-3. Refer to Figure 11.4-1b. Should the slopes of the downgoing and upcoming waves associated with a layer be the same in magnitude?

Exercise 11-4. What procedure does CMP stacking correspond to in the f − k domain?

Exercise 11-5. Sketch the traveltime response for a point scatterer on a zero-offset VSP record.

Exercise 11-6. Consider a CMP gather with a single reflection event. Suppose you have applied hyperbolic moveout correction using equation (90) and discovered that the event is not flat for all offsets. Instead, the moveout-corrected event may have one of the three shapes shown in Figure 11.E-1. Match each of the curves A, B, and C with the following three possibilities:

  1. You have applied hyperbolic moveout correction using an erroneously low velocity in equation (90).
  2. You have applied a second-order moveout correction (equation 3-4b) to an event that has a fourth-order moveout behavior described by equation (3-5a).
  3. You have ignored anisotropy in moveout correction described by equation (92).

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Reservoir geophysics exercises
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