Reservoir Geology

26 Questions

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Geology Quizzes & Trivia

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. 
    • 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