# Seismic Wave & Imaging (September 2016)

20 Questions | Total Attempts: 94  Settings Create your own Quiz 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!

• 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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