CPG Technology & Digital Tools 2

Question 1

Which seismic attribute is most commonly used to identify direct hydrocarbon indicators (DHIs) such as bright spots?

Accepted Answer

Amplitude

Answer

Amplitude anomalies (bright spots) are the most widely recognized DHI on seismic data, indicating gas-charged sands due to impedance contrast changes.

Question 2

In petrophysical software, what does the 'Archie equation' primarily calculate?

Accepted Answer

Water saturation from resistivity logs

Answer

Archie's equation uses formation resistivity, water resistivity, and porosity to estimate water saturation in clean (non-shaly) reservoir rocks.

Question 3

What is the primary purpose of a velocity model in seismic processing?

Accepted Answer

To convert seismic travel times to depths

Answer

The velocity model is used to perform time-to-depth conversion and migration, transforming seismic travel times into accurate subsurface depth representations.

Question 4

Which GIS data format is most commonly used to store vector-based geological map data with associated attribute tables?

Accepted Answer

Shapefile

Answer

Shapefiles (ESRI format) store vector geometry (points, lines, polygons) plus attribute tables and are the standard for GIS-based geological mapping.

Question 5

In reservoir simulation, what does 'history matching' involve?

Accepted Answer

Calibrating the model to reproduce observed production data

Answer

History matching adjusts reservoir model parameters (permeability, transmissibility, contacts) until the simulation reproduces actual historical production and pressure data.

(CPG) Certified Petroleum Geologist Practice Test

(CPG) Certified Petroleum Geologist Practice Test

CPG Technology & Digital Tools 2