SPE Reservoir Characterization 3

Question 1

What is the Archie equation primarily used to calculate in petrophysics?

Accepted Answer

Water saturation from resistivity and porosity measurements

Answer

Archie's law relates formation resistivity, porosity, and water resistivity to calculate water saturation (Sw) in clean formations.

Question 2

In geostatistical reservoir modeling, what is the key difference between Sequential Gaussian Simulation (SGS) and Kriging?

Accepted Answer

SGS produces multiple equiprobable realizations while Kriging produces a single smooth best-estimate

Answer

SGS generates stochastic realizations that honor data and reproduce variogram statistics, whereas Kriging produces a unique smoothed estimate that under-represents heterogeneity.

Question 3

Which core analysis technique directly measures the three-dimensional pore network geometry without destroying the sample?

Accepted Answer

Micro-CT scanning

Answer

Micro-CT (computed tomography) scanning creates 3D images of pore space at micron resolution without altering the sample.

Question 4

What is the primary driving force for fluid flow in a petroleum reservoir according to Darcy's Law?

Accepted Answer

Pressure gradient

Answer

Darcy's Law states that flow rate is proportional to the pressure gradient across a porous medium, adjusted for fluid viscosity and rock permeability.

Question 5

In a carbonate reservoir, which diagenetic process most commonly creates secondary porosity after deposition?

Accepted Answer

Dolomitization and dissolution (karstification)

Answer

Dolomitization replaces calcite with smaller dolomite crystals, creating intercrystalline pores, while dissolution creates vugs and fractures in carbonates.

(SPE) Society of Petroleum Engineers Certification Practice Test

(SPE) Society of Petroleum Engineers Certification Practice Test

SPE Reservoir Characterization 3