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

Permeability

Answer

Saturation

Answer

Compressibility

Question 2

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

Accepted Answer

Contact with grain surfaces

Answer

Center of pore throats

Answer

Gas cap zone

Answer

Top of the reservoir

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

The maximum water saturation achievable by waterflooding

Answer

The average water saturation in the transition zone

Answer

The water saturation at the free water level

Question 4

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

Accepted Answer

Gamma ray log

Answer

Neutron porosity log

Answer

Resistivity log

Answer

Sonic log

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

Measure formation temperature gradient

Answer

Determine the mechanical strength of the formation

Answer

Evaluate cement bond quality behind casing

Question 6

In reservoir characterization, what does 'facies' refer to?

Accepted Answer

A body of rock with defined characteristics reflecting its depositional environment

Answer

The geometric shape of a reservoir trap

Answer

The pressure compartments within a reservoir

Answer

The fluid contacts identified on logs

Question 7

Which method uses the relationship between capillary pressure and fluid saturation to estimate reservoir rock quality and pore structure?

Accepted Answer

Mercury injection capillary pressure (MICP) analysis

Answer

Dean-Stark extraction

Answer

X-ray diffraction (XRD)

Answer

Thin section petrography