What kind of mathematical curve (or function) might we see for the travel-time curve (or function) on a seismic shot gather representing the reflection from the dipping base of a single layer?   What do we call a seismic gather in which each trace has the same shot-receiver distance?   Write down an equation that expresses Snell’s law.   If we have a two-layer situation where V1 = 1950 m/s and V2 = 3900 m/s (P-wave velocities), what will the P-wave critical angle be?

Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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  1. How would the P-wave velocity of a porous, water-saturated sandstone change if some of the water were replaced by natural gas?

 

  1. When a P-wave strikes the interface between two rock layers at normal incidence (angle of incidence = 90o), what waves travel on from there, and which way?

 

  1. 2D seismic data are acquired along a 1D line on the surface. 3D seismic data are acquired over a 2D area of the surface. How is 4D seismic data acquired?

 

  1. The acoustic impedance of a rock layer is a parameter that may be calculated from some other common rock parameters. Write down an expression for this calculation in words, not just symbols (unless you define the symbols).

 

  1. What kind of mathematical curve (or function) might we see for the travel-time curve (or function) on a seismic shot gather representing the reflection from the dipping base of a single layer?

 

  1. What do we call a seismic gather in which each trace has the same shot-receiver distance?

 

  1. Write down an equation that expresses Snell’s law.

 

  1. If we have a two-layer situation where V1 = 1950 m/s and V2 = 3900 m/s (P-wave velocities), what will the P-wave critical angle be?

 

 

 

9. In this figure, what will be observed that will help
locate the salt body?
10.In a gravity survey, what observations must you acquire (or what
information do you need) in order to be able to carry out a drift correction?
11. In a gravity survey, what observations do you have to acquire (or, what
information do you need) in order to be able to carry out the Bouguer
correction?
12.If you apply the free-air correction in a gravity survey, what does it correct
for?
13. You have a seismic line from a region where problems were caused by a
great assortment of structures (faults, folds, dipping boundaries, etc.) in the
deep subsurface. What sort of seismic process do you think you'll need to
apply?
14.What process was applied
to (a) to get (b)?
(a)
(a)
(b)
15. What happens to the earth's gravitational force when moving from the
equator to the north pole.
Transcribed Image Text:9. In this figure, what will be observed that will help locate the salt body? 10.In a gravity survey, what observations must you acquire (or what information do you need) in order to be able to carry out a drift correction? 11. In a gravity survey, what observations do you have to acquire (or, what information do you need) in order to be able to carry out the Bouguer correction? 12.If you apply the free-air correction in a gravity survey, what does it correct for? 13. You have a seismic line from a region where problems were caused by a great assortment of structures (faults, folds, dipping boundaries, etc.) in the deep subsurface. What sort of seismic process do you think you'll need to apply? 14.What process was applied to (a) to get (b)? (a) (a) (b) 15. What happens to the earth's gravitational force when moving from the equator to the north pole.
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