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Exploration Geophysics ( GHT 410 ) – 2013


Department of Geology
University of Dhaka
Fourth-Year B.S.11onours Course -Final Examination 2013
Subject: Geology
Course: GHT 410 Course Name: Exploration Geophysics
Subjective Part
Time 2 Hours Full marks 25

The. figure at the right margin indicates full marks. Answer any /lee of the following questions.
Answers should accompany suitable sketches and/or diagrams wherever necessary.

1.
a) What do you mean by Fourier Transformation? Mention the advantages of using Fourier
Transformation in data processing. 1.5
b) What is correlation? Explain the cross correlation operation by taking two digital data
sets. 2.0
c) Illustrate and explain the difference between band pass and band reject frequency filters. 1.5

2.
a) Mention the importance of seismic velocity. 1.0
b) Discuss the various causes of velocity distortion. 2.5
c) How is stacking velocity determined? 1.5

3.
a) Distinguish between structural and stratigraphic interpretations of seismic data. 1.5
b) Illustrate the seismic evidences of a reef structure. Mention its economic significance. 2.0
c) Discuss the amplitude anomalies related to hydrocarbon occurrence. 1.5
4.
a) Mention the necessity of geophysical wireline logging. 1.5
b) Explain the functioning of a mechanical caliper tool. 2.0
c) Write about the factors that arc necessary to provoke SP current around a bore hole. 1.5

5.
a) “SP log is a qualitative indicator of formation water.” Explain. 1.0
b) Draw a schematic diagram to show ‘tone of invasion around a bore hole, equivalent
representation of fluid mixing, and equivalent resistivity profile. 2.5
c) List the various resistivity tools and schematically show the type of resistivity measured
by various tools. 1.5

6.
a) How is bulk density of a subsurface formation measured by density log? 1.5
b) Write about the quantitative use of density log in the evaluation of porosity. 2.0
c) Explain the working principle of neutron porosity log. 1.5

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One Comment

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