3-D seismic exploration exercises

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Exercise 7-1. From the time slices in Figure 7.E-1, infer the structural pattern in the subsurface.

Exercise 7-2. Approximately at what angle is the pseudosun illuminating the time slice in Figure 7.5-3?

Exercise 7-3. What are the advantages and disadvantages of dip-line and strike-line shooting in terms of (a) crossline smear, (b) DMO, (c) spatial aliasing, and (d) velocity estimation?

Exercise 7-4. Suppose you did a 2-D survey over the salt dome structure shown in Figure 7.3-9 and applied 2-D imaging to your data. Then you did a 3-D survey and 3-D imaging. Consider mapping the top of the salt. Which one, 2-D or 3-D seismic, will imply a salt dome structure with a larger spatial extent and structural closure?

Exercise 7-5. If you use the 90-degree 3-D phase-shift algorithm (Section G.3) in 3-D time migration, do you have to do it in one pass?

Exercise 7-6. Consider a dual-boat operation in a 3-D survey such that line spacings alternate between 112.5 and 37.5 m. Is this equivalent to a single-boat operation with 75-m line spacing?

Exercise 7-7. How would you obtain 3-D migration of a crossline section without having to do 3-D migration of the entire 3-D data set?

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3-D seismic exploration exercises
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