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Applied Petroleum Geology ( GHT 408 ) – 2013


Department of Geology
University of Dhaka
Fourth -Year B.S. Honor’s Course -Final Examination 2013
Subject: Geology
Course: GHT 408 Course Name: Applied Petroleum Geology
Subjective Part
Full marks 25 Time 2 Hours

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

1.
a) Why do micaceous sand and placer sand give high gamma -ray reading? 1.5
b) What is the effect of gas zone on neutron log? Why does such effect take place? 2.0
c) How would you detect overpressure using sonic log? 1.5

2.
a) “Sands texture influences the resistivity of the formation passively.” Explain. . 1.5
b) Draw a diagram to show the components of drill stem and point out the main work of each component. 1.5
c) Comment on the petroleum prospect of the Stable Shelf area of the Bengal Basin. 2.0

3.
a) What are the examinations a drill -site geologist would perform on the drill cuttings? 1.5
b) What are the geophysical methods for direct detection of hydrocarbon? 1.5
c) Rate the different zones of the Chittagong fold belt for their gas prospect. 2.0

4.
a) How would you detect the presence of hydrocarbon in a combined trace of neutron and density logs? 1.0
b) Name the zones of invasion around a bore hole and give their respective resistivity notation. 1.0
c) Draw a simple diagram to show the interrelationship of (i) texture, (ii) formation resistivity factor (F), and (iii) formation resistivity (R). 1.0
d) During drilling through a coal -bearing sand -shale sequence how would you detect the coal layers in both the (i) sonic log and (ii) density log. 1.0
e) Rearrange the following lithologies according to gamma -ray radiation level — the highest at (I) and the lowest at (V):
coal; organic shale; limestone; argillaceous sandstone; and siltstone 1.0

5.
a) Mention why blowouts are more likely during trips. 1.5
b) What are the indications of fluid flows from rock formation into the borehole? 2.0
c) What would happen if formation fluid enters the borehole? How would you tackle the situation as a drilling worker? 1.5

6.
a) Describe the properties of individual seismic pulse in deciphering sequence boundaries. How can the clay and the carbonate lithologies be detected from seismic traces? 2.5
b) Define flat spot, bright spot, and dim spot. 1.5
c) Point out the causes of velocity distortions. 1.0

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