Practice Test Geeks(CPG) Certified Petroleum Geologist Practice Test

CPG Cheat Sheet 2026

The 30 highest-yield CPG facts, distilled from real exam questions. Print it, save it as a PDF, or study it here โ€” free, no sign-up.

CPG exam key facts

  • Annual membership dues for certified members in the AAPG Division of Professional Affairs are $50 USD per year. Source
  • The Certified Petroleum Geologist credential is valid for a period of one year and must be renewed annually. Source
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  1. What type of rock is most commonly associated with reservoir rocks? โ†’ Sandstone
  2. What does the neutron-density crossplot primarily identify in formation evaluation? โ†’ Lithology and gas-bearing zones
  3. Why is velocity analysis important in seismic data processing? โ†’ To ensure accurate depth imaging and interpretation
  4. Which petrophysical parameter is most critical for assessing the economic viability of a tight gas or shale formation? โ†’ Total organic carbon (TOC) combined with effective porosity and gas saturation
  5. A salt diapir can create hydrocarbon traps through which of the following mechanisms? โ†’ Flank anticlines, cap rock seals, and fault traps around the diapir
  6. Which approach best demonstrates professional competency in CPG practice? โ†’ Integrating education, experience, and evidence-based decision making
  7. In NMR logging, what does the T2 distribution primarily represent? โ†’ Pore size distribution, with larger pores having longer T2 relaxation times
  8. How do CPG professionals establish measurable quality objectives? โ†’ Defining specific, measurable, achievable, relevant, and time-bound targets
  9. Which tectonic setting is MOST favorable for the formation of foreland basin petroleum systems? โ†’ Continental collision and thrust belt systems
  10. Subsidence analysis (backstripping) in basin analysis is primarily used to: โ†’ Separate tectonic subsidence from sediment loading effects
  11. What does a structural trap rely on? โ†’ Folding or faulting of rock layers
  12. In petrophysical analysis, the Archie equation is used to calculate: โ†’ Water saturation from resistivity and porosity data
  13. Strike-slip (wrench) faults most commonly create hydrocarbon traps through which structural mechanism? โ†’ Flower structures and en-echelon folds
  14. Which well log is BEST suited for identifying gas-bearing reservoirs through the 'gas effect'? โ†’ Neutron porosity log
  15. Which analytical technique is used to directly measure the carbon isotopic composition (ฮดยนยณC) of individual biomarker compounds in a crude oil? โ†’ Compound-specific isotope analysis (CSIA) using GC-IRMS
  16. Which of the following best describes the process of 'secondary cracking' in petroleum geochemistry? โ†’ Thermal cracking of oil already in a reservoir to gas and condensate at high temperatures
  17. How do continuing education requirements benefit CPG certified professionals? โ†’ They ensure professionals stay current with evolving industry practices
  18. Which seismic attribute is MOST useful for detecting stratigraphic traps associated with channel sand bodies? โ†’ Coherence/similarity attribute
  19. What is the function of a cap rock in a petroleum trap? โ†’ To seal the reservoir
  20. What distinguishes a peer-reviewed study from other publications? โ†’ Independent experts evaluated the methodology and conclusions before publication
  21. In Rock-Eval pyrolysis, what does the S2 peak represent? โ†’ Remaining generative potential โ€” hydrocarbons released by thermal cracking of kerogen
  22. Which structural feature forms in extensional settings where a fault block tilts, creating a rollover anticline in the hanging wall? โ†’ Rollover anticline above a listric normal fault
  23. Which geological features are commonly identified using seismic interpretation? โ†’ Faults, folds, and stratigraphic traps
  24. How should CPG professionals measure success in advanced professional practice? โ†’ Using defined metrics, benchmarks, and regular evaluation against established goals
  25. What distinguishes quality assurance from quality control in Certified Petroleum Geologist practice? โ†’ QA prevents defects through process design while QC detects defects through inspection
  26. The 'oil window' in a sedimentary basin typically corresponds to vitrinite reflectance values of approximately: โ†’ 0.6โ€“1.3% Ro
  27. What is an Environmental Impact Statement (EIS)? โ†’ A comprehensive environmental analysis
  28. How should CPG professionals prioritize identified risks? โ†’ Based on likelihood of occurrence combined with potential impact severity
  29. Which technique helps improve image clarity in seismic interpretation? โ†’ Migration
  30. Which geophysical method helps identify potential reservoirs? โ†’ Seismic reflection
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How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  1. aapg.org โ€” Fees, eligibility, renewal, score validity ยท verified Oct 2026