SPE Reservoir Characterization 2

Question 1

Which petrophysical parameter is defined as the ratio of pore volume to total bulk volume of a rock sample?

Accepted Answer

Porosity

Answer

Porosity is the ratio of pore volume to bulk volume, expressed as a fraction or percentage.

Question 2

In a water-wet reservoir, where does water preferentially reside?

Accepted Answer

Contact with grain surfaces

Answer

In water-wet systems, water coats grain surfaces and occupies smaller pore spaces due to its affinity for the rock.

Question 3

What does the term 'irreducible water saturation' (Swi) represent in reservoir engineering?

Accepted Answer

The minimum water saturation that cannot be displaced by hydrocarbons

Answer

Irreducible water saturation is the minimum water held by capillary and adsorptive forces that cannot be displaced by oil or gas.

Question 4

Which log is most commonly used to identify lithology changes and correlate stratigraphic units across wells?

Accepted Answer

Gamma ray log

Answer

The gamma ray log measures natural radioactivity, distinguishing shales (high GR) from clean sands or carbonates (low GR) for lithology and correlation.

Question 5

What is the primary purpose of a repeat formation tester (RFT) or modular dynamic tester (MDT) in well logging?

Accepted Answer

Obtain downhole fluid samples and pressure measurements at discrete depths

Answer

RFT/MDT tools set packers to seal off intervals, measure formation pressure, and collect representative fluid samples at multiple depths.

(SPE) Society of Petroleum Engineers Certification Practice Test

(SPE) Society of Petroleum Engineers Certification Practice Test

SPE Reservoir Characterization 2