Reservoir Geology
Settings
-
+
When it comes to a reservoir, there are some rocks that can be found in it, some permeable, semipermeable and others not permeable. Do you think you have a good understanding on these types of rocks or are you in search of a refresher on what we covered in geology class on them? Why don’t you take up the quiz below and see what you can recall?
- 1.Which of the following statements is true?
- A.
A rock can have porosity without having permeability
- B.
A rock's porosity is a measure of the ease with which fluid flows through a reservoir
- C.
A rock's permeability is the ratio of empty space to the total volume of rock
- 2.A rock can have permeability without having porosity?
- A.
True
- B.
False
- 3.Pore throat diameters _________ in reservoirs with very fine clay mineral.
- A.
Increase
- B.
Decrease
- C.
Stay the same
- 4.The spatial arrangement of grains within a reservoir refers to:
- A.
Packing
- B.
Sorting
- C.
Compaction
- D.
Cementation
- 5.Primary porosity is defined as:
- A.
Pore space created by dissolution of fracturing of rock
- B.
Pore space that is interconnected
- C.
Pore space that is isolated, or not interconnected
- D.
Pore space created during deposition of sediments
- 6.Secondary porosity is defined as:
- A.
Interconnected pore space created by dissolution
- B.
Pore space created after deposition by some diagenetic process
- C.
Isolated pore space created during deposition of sediments
- D.
Pore space that does not contribute to fluid flow
- 7.Effective porosity is defined as:
- A.
Isolated pore space created during deposition of sediments
- B.
Isolated pore space created after deposition by some diagenetic process
- C.
Interconnected pore space that contributes to fluid flow
- D.
Interconnected pore space that is completely filled or obstructed by cements
- 8.Non-effective porosity is defined as:
- A.
Pore space that is isolated, or not interconnected
- B.
Interconnected pore space that contributes to fluid flow
- C.
Pore space created during deposition of sediments
- D.
Pore space created by dissolution or fracturing of rocks
- 9.The distribution of grain sizes within a reservoir refers to:
- A.
Compaction
- B.
Sorting
- C.
Packing
- D.
Cementation
- 10.As the grain size of sediments decreases, permeability of the rock will ________.
- A.
Increase
- B.
Decrease
- C.
Stay the same
- 11.Morphology is the external structure of rocks in relation to the development of erosional forms or topographic features.
- A.
True
- B.
False
- 12.Which of the following are part of primary porosity?
- A.
Interparticle
- B.
Intraparticle
- C.
Intercystalline
- D.
Shelter
- E.
Fracture
- F.
Channel
- G.
Vug
- 13.Which of the following are part of secondary porosity?
- A.
Interparticle
- B.
Intraparticle
- C.
Intercystalline
- D.
Shelter
- E.
Fracture
- F.
Channel
- G.
Vug
- 14.It is possible for a reservoir with large amounts of pore space to be completely impermeable.
- A.
True
- B.
False
- 15.Which are the following are true statements about grain size?
- A.
Has little impact on porosity but may greatly affect permeability
- B.
Bigger the grain size the better the permeability
- C.
Has a great impact on porosity but may not affect permeability
- D.
Bigger the grain size the lowers the permeability
- 16.
- A.
Well Sorted
- B.
Poorly Sorted
- C.
Half Sorted
- D.
Fully Sorted
- E.
Average Sorted
- 17.Reservoirs with grains that have the same size are called
- A.
Well Sorted
- B.
Poorly Sorted
- C.
Half Sorted
- D.
Fully Sorted
- 18.Reservoirs with grains that are different sizes are called
- A.
Well Sorted
- B.
Poorly Sorted
- C.
Half Sorted
- D.
Fully Sorted
- 19.Well sorted reservoirs results in poor porosity and permeability.
- A.
True
- B.
False
- 20.Poorly sorted reservoirs results in poor porosity and permeability.
- A.
True
- B.
False
- 21.As grain shape become less spherical the porosity and permeability is lowered.
- A.
True
- B.
False
- 22.As overburden pressure increases the porosity and permeability is increased.
- A.
True
- B.
False
- 23.As grains become more closely packed, porosity and permeability is reduced.
- A.
True
- B.
False
- 24.Cementation causes a(n) ________ in porosity and permeability.
- A.
Increase
- B.
Decrease
- C.
No change
- 25.Most sandstones consist of grains that are cemented together by either _____ or ______.
- A.
Quartz
- B.
Calcite
- C.
Halite
- D.
Gypsum
- 26.To achieve total porosity, effective porosity and non-effective porosity are added together.
- A.
True
- B.
False
Back to top