Reservoir Geology

26 Questions | By Jtodlozil | Updated: Mar 21, 2022 | Attempts: 1271

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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?

Questions and Answers

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.

What are the different types of sorting?
- 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