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Principles of Petroleum Geology ( GHT 407 ) – 2013


Department of Geology
University of Dhaka
Fourth -Year B.S. Honor’s Course -Final Examination 2013
Subject: Geology
Course: GHT 407 Course Name: Principles of Petroleum Geology
Subjective Part
Time 2, Hours Full marks 25

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) Distinguish between paraffinic oil and aromatic oil in terms of composition and organic matter source. 2.0
b) “The Niger Delta is rich in both oil and gas whereas the Bengal Delta is rich only in gas.” Explain the above from a geological viewpoint. 1.5
c) Note the difference between natural gas produced within diagenesis zone and that produced during catagenesis zone. 1.5

2.
a) What is gas window? Draw a diagram to show its position with respect to oil window. 1.5
b) What does happen in the metagenesis zone? 1.5
c) Give a classification of organic matter as proposed by Tissot and Welts, and note the oil and gas generating potential of each class. 2.0

3.
a) Draw a diagram to show the following elements of a trap:
(i) closure, (ii) amplitude, (iii) spill point, (iv) edge water, and (v) gas -water contact. 1.5
b) What are (i) a diapir and (ii) a growth fault? Show the various petroleum traps formed by these two structures. 1.5
c) How are development of stratigraphic traps related to the depositional sedimentary environments? 2.0

4.
a) Differentiate between primary and secondary migrations with neat diagrams. 1.0
b) Explain with the help of suitable diagrams the physicochemical aspects of primary migration in terms of (i) temperature and pressure, (ii) compaction, and (iii) role of fluids. 2.0
c) Write a critical account on modes of primary migration of petroleum hydrocarbons under various hypotheses. 2.0

5.
a) What do you understand by overpressure? Mention the factors that are responsible for generation of overpressure in the subsurface. 2.0
b) Compare sandstone with limestone in terms of reservoir rocks. 1.5
c) Comment on how the traditional concepts of petroleum reservoir rocks have changed in the recent time in the light of unconventional oil and gas finds. 1.5

6. Write short notes on the following: 1.0 x 5 5.0
a) Combination trap
b) Sapropelic organic mutter
c) Vitrinite
d) Seconclary migration of petroleum
e) Heavy oil

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