SPE - Society of Petroleum Engineers Reservoir Characterization Questions and Answers

Question 1

An operator is characterizing a newly discovered clastic reservoir.
Routine core analysis (RCA) has been performed on several conventional cores.
Which of the following sets of properties is MOST directly determined from RCA?

Accepted Answer

Porosity, permeability, and grain density

Answer

Capillary pressure and relative permeability

Answer

Wettability and irreducible water saturation

Answer

Formation resistivity factor and cementation exponent

Question 2

In well log interpretation for reservoir characterization, a 'crossover' effect where the neutron porosity curve reads lower than the density porosity curve in a clean, liquid-filled formation is a classic indicator of what?

Accepted Answer

A gas-bearing zone

Answer

A high-pressure zone

Answer

A fractured carbonate

Answer

A shale or clay-rich interval

Question 3

A reservoir engineer is building a static geological model and needs to distribute petrophysical properties like porosity between wells. Which of the following techniques is specifically designed to account for spatial correlation and directionality of reservoir properties?

Accepted Answer

Geostatistics (e.g., Kriging)

Answer

Monte Carlo simulation

Answer

Inverse distance weighting

Answer

Linear regression

Question 4

During the analysis of a 3D seismic volume, an interpreter identifies a high-amplitude anomaly that conforms to the structural closure of a potential reservoir. This feature is often referred to as a 'bright spot'. What is the most likely cause of this bright spot?

Accepted Answer

The presence of low-impedance gas-charged sand

Answer

A dense, low-porosity carbonate stringer

Answer

A significant increase in water saturation

Answer

A facies change to a very dense shale

Question 5

An asset team is trying to determine the oil-water contact (OWC) in a reservoir compartment. They have pressure data from a Repeat Formation Tester (RFT) tool run in a new well. How is the OWC identified from this pressure data?

Accepted Answer

At the point where the pressure gradient changes from the oil gradient to the water gradient

Answer

By identifying the depth with the lowest recorded pressure

Answer

By calculating the average pressure of the entire hydrocarbon column

Answer

At the depth corresponding to the highest observed mud filtrate invasion

Question 6

Which of the following data integration approaches is most critical for reducing uncertainty in a reservoir model away from well control?

Accepted Answer

Integrating 3D seismic attribute data with well log petrophysical properties

Answer

Correlating Special Core Analysis (SCAL) data with Routine Core Analysis (RCA) data

Answer

Calibrating well log-derived porosity with core porosity

Answer

Analyzing historical production data from analog fields

An operator is characterizing a newly discovered clastic reservoir.Routine core analysis (RCA) has been performed on several conventional cores.Which of the following sets of properties is MOST directly determined from RCA?

An operator is characterizing a newly discovered clastic reservoir.
Routine core analysis (RCA) has been performed on several conventional cores.
Which of the following sets of properties is MOST directly determined from RCA?