Seismic Wave & Imaging (September 2016)

20 Questions | Total Attempts: 63

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Seismic Wave & Imaging (September 2016)

QUIZ for QAB 3013: Seismic Wave & Imaging (September 2016 Semester)Instruction to the students:1. There are 11 multiple choice questions, 9 true / false questions. 2. Answer ALL the questions3. Time given for this quiz is 25 minutes4. No time extension will be allowed. Good luck!


Questions and Answers
  • 1. 
    Why do we need seismic migration / imaging?
    • A. 

      Removing the effect of noise and multiples from the seismic data.

    • B. 

      Enhancing velocity information of subsurface.

    • C. 

      Correct apparent reflector position in preprocessing seismic data.

    • D. 

      As a connector to GeologyGeophysics sequence (G&G Link).

  • 2. 
    The following are the information can be obtained from a seismic trace EXCEPT:
    • A. 

      Wavenumber.

    • B. 

      Bulk Modulus.

    • C. 

      Velocity.

    • D. 

      Frequency.

  • 3. 
    What is the TRUE concept of a wave?
    • A. 

      Wave move in plane and only able to travel in a straight line.

    • B. 

      Wave can be reflected, refracted, diffracted and transmitted.

    • C. 

      Wave can’t be attenuated by any factor.

    • D. 

      The wave movement is a process of heat transfer.

  • 4. 
    When a Pwave strikes an interface, the energy will be partitioned into the following waveEXCEPT:
    • A. 

      Reflected Shear wave.

    • B. 

      Transmitted Shear wave.

    • C. 

      Reflected Surface wave.

    • D. 

      Reflected Pressure wave.

  • 5. 
    Which of the following sequence indicate the correct velocity sequence (from fastest to slowest) ?
    • A. 

      Scholte wave --> Swave --> Rayleigh wave --> Love wave.

    • B. 

      Pwave --> Swave --> Rayleigh wave --> Love wave .

    • C. 

      Pwave --> Love wave --> Rayleigh wave --> Swave.

    • D. 

      Pwave --> Stoneley wave --> Swave --> Scholte wave.

  • 6. 
    A diffraction response for a homogeneous single velocity media is:
    • A. 

      NonHyperbolic.

    • B. 

      Amplitude decays exponentially from apex.

    • C. 

      Phase is asymmetrical.

    • D. 

      Frequency attenuated with depth.

  • 7. 
    The following is principle of Huygens’ Principle EXCEPT:
    • A. 

      Every point is the source of a secondary wave front.

    • B. 

      These secondary wave front can propagate upward or downward.

    • C. 

      Amplitude & phase in secondary wave front is same as the primary wave front.

    • D. 

      The superposition of these secondary wave front will create a new wave front.

  • 8. 
    Diffraction hyperbola for a constant velocity is:
    • A. 

      Same irrespective of depth.

    • B. 

      Narrower as depth increase.

    • C. 

      Broader as depth increase.

    • D. 

      Shorter as depth increase.

  • 9. 
    Summing the energy along the diffraction hyperbola is a type of:
    • A. 

      FK migration.

    • B. 

      Kirchhoff migration.

    • C. 

      Downward continuation migration.

    • D. 

      Geometrical migration.

  • 10. 
    Which one of the following statements regarding real geology, time migration & depth migration is TRUE:
    • A. 

      Time section migration is equivalent with depth migration.

    • B. 

      There is discrepancies of time and depth migration.

    • C. 

      Time migration requires a velocity model for imaging.

    • D. 

      Time migration better image the points position compare to depth migration.

  • 11. 
    An unmigrated dipping reflector has a 25 degree dip measured from the flat surface. Calculate the migrated reflector dipping angle.
    • A. 

      22.91 degree

    • B. 

      25.91 degree

    • C. 

      27.79 degree

    • D. 

      37.79 degree

  • 12. 
    Fresnel zone is a function of depth only.
    • A. 

      True

    • B. 

      False

  • 13. 
    Reflection coefficient as a function of angle for a plane wave impinging on a plane reflector obeys Zoeppritz equations.
    • A. 

      True

    • B. 

      False

  • 14. 
    Shear wave cannot pass through saturated rock.
    • A. 

      True

    • B. 

      False

  • 15. 
    Acoustic wave can be derived from Newton 1st Law and Hooke's Law.
    • A. 

      True

    • B. 

      False

  • 16. 
    Rayleigh wave has velocity close to P-wave.
    • A. 

      True

    • B. 

      False

  • 17. 
    P-wave cannot pass through gaseous media.
    • A. 

      True

    • B. 

      False

  • 18. 
    Diffraction curves are wider as depth increases.
    • A. 

      True

    • B. 

      False

  • 19. 
    Lowering full fold data may affect the resolution of the seismic data.
    • A. 

      True

    • B. 

      False

  • 20. 
    Energy absorption occurs when the wave propagate through fast velocity zone.
    • A. 

      True

    • B. 

      False

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