Core Analysis Lab – MCQs 50 Score: 0 Attempted: 0/50 Subscribe 1. What is the primary objective of core analysis in petroleum engineering? (A) To determine drilling mud composition (B) To evaluate rock and fluid properties of reservoirs (C) To measure seismic activity (D) To design pipelines 2. Porosity of a rock is defined as: (A) Ratio of bulk volume to grain volume (B) Ratio of pore volume to bulk volume (C) Ratio of grain volume to pore volume (D) Ratio of matrix to mineral volume 3. The percentage of interconnected pores that allow fluids to flow is called: (A) Total porosity (B) Effective porosity (C) Absolute porosity (D) Grain density 4. Permeability of a rock is measured in: (A) Darcy or millidarcy (B) PSI (C) Joules (D) Poise 5. Which laboratory test is used to measure permeability? (A) Boyle’s law test (B) Darcy’s law test (C) Archimedes’ principle (D) Rock compressibility test 6. Which method is commonly used to measure porosity in cores? (A) Helium porosimetry (B) Infrared scanning (C) Seismic survey (D) Gravimetric analysis 7. Grain density of reservoir rocks is typically measured using: (A) Gas expansion method (B) Water immersion method (C) Pycnometer method (D) All of the above 8. The main factor controlling permeability is: (A) Grain density (B) Pore throat size and connectivity (C) Color of the rock (D) Rock weight 9. Saturation in core analysis refers to: (A) Volume of water relative to oil (B) Fraction of pore space filled with a specific fluid (C) Total rock volume (D) Grain surface area 10. The irreducible water saturation (Swir) means: (A) Water that can be produced easily (B) Minimum water content trapped in pore spaces (C) Water saturation at 100% (D) Water added artificially 11. A common device used for porosity measurement is: (A) Helium porosimeter (B) Thermocouple (C) Manometer (D) Calorimeter 12. In core analysis, permeability anisotropy means: (A) Equal permeability in all directions (B) Different permeability in different directions (C) Zero permeability (D) Constant flow rate 13. Which property is measured by capillary pressure experiments? (A) Wettability and pore size distribution (B) Seismic velocity (C) Grain shape (D) Rock color 14. Core flooding experiments are conducted to: (A) Determine fluid–rock interactions under reservoir conditions (B) Identify drilling fluid properties (C) Measure seismic properties (D) Study cement hydration 15. Mercury intrusion porosimetry is primarily used for: (A) Grain density measurement (B) Pore throat size distribution (C) Rock mineralogy (D) Rock color 16. What does Archie’s equation relate? (A) Porosity, permeability, and pressure (B) Porosity, water saturation, and resistivity (C) Grain density and color (D) Core length and diameter 17. The standard unit of porosity is: (A) PSI (B) % (percentage) (C) Darcy (D) Liters 18. The Klinkenberg correction is applied to: (A) Gas permeability measurements (B) Liquid density (C) Rock compressibility (D) Core length 19. Which factor does NOT affect permeability? (A) Pore throat size (B) Grain size distribution (C) Rock color (D) Pore connectivity 20. Electrical resistivity tests on cores help estimate: (A) Hydrocarbon saturation (B) Rock mineralogy (C) Porosity directly (D) Grain density 21. Wettability of a rock determines: (A) Whether rock prefers oil or water on its surface (B) Rock density (C) Grain structure (D) Elastic modulus 22. Which liquid is commonly used in porosity tests? (A) Water (B) Helium (C) Kerosene (D) Alcohol 23. The dimensionless number used in relative permeability is: (A) Reynolds number (B) Capillary number (C) Mobility ratio (D) Saturation fraction 24. The purpose of core cleaning before analysis is: (A) To remove residual hydrocarbons and salts (B) To reduce weight (C) To polish rock surfaces (D) To increase porosity artificially 25. Boyle’s law is applied in which core analysis method? (A) Gas expansion porosity measurement (B) Resistivity measurement (C) Capillary pressure (D) Permeability testing 26. What is residual oil saturation? (A) Maximum producible oil (B) Oil that remains trapped after water flooding (C) Oil added artificially (D) Oil saturation at 100% 27. Which factor increases relative permeability to oil? (A) Higher water saturation (B) Higher oil saturation (C) Higher gas saturation (D) No fluids present 28. What is the role of core plugs in core analysis? (A) Miniature samples taken from full cores for lab tests (B) Used for drilling bit design (C) Seismic modeling (D) Rock color determination 29. Which test measures compressibility of reservoir rock? (A) Triaxial compression test (B) Boyle’s law test (C) Capillary pressure test (D) Resistivity test 30. The process of restoring core samples to reservoir conditions is called: (A) Cleaning (B) Aging (C) Saturating (D) Reconstitution 31. The helium porosimeter is preferred because helium: (A) Reacts with rock (B) Does not react and penetrates small pores (C) Is heavier than air (D) Changes porosity 32. Core permeability to a single phase fluid is called: (A) Absolute permeability (B) Effective permeability (C) Relative permeability (D) Dynamic permeability 33. A sample with high porosity but low permeability usually has: (A) Large pore throats (B) Poor connectivity (C) High fluid flow (D) High grain density 34. Core samples are usually taken during: (A) Well logging (B) Drilling operations (C) Refinery processing (D) Transportation 35. Which type of porosity results from fractures? (A) Primary porosity (B) Secondary porosity (C) Effective porosity (D) Total porosity 36. Core analysis helps determine: (A) Reservoir quality (B) Drilling bit design only (C) Cement quality only (D) Refinery output 37. The main advantage of sidewall coring over conventional coring is: (A) Faster and cheaper sampling (B) Larger sample volume (C) Better porosity measurement (D) Less need for cleaning 38. Which gas is often used in permeability tests? (A) Helium (B) Nitrogen (C) Oxygen (D) Carbon dioxide 39. What is the purpose of special core analysis (SCAL)? (A) To determine advanced reservoir properties like wettability and relative permeability (B) To identify drilling bit size (C) To design pipelines (D) To measure cement strength 40. Relative permeability to gas increases as: (A) Gas saturation increases (B) Water saturation increases (C) Oil saturation increases (D) No fluid present 41. Which law governs fluid flow in porous media? (A) Darcy’s law (B) Newton’s law (C) Boyle’s law (D) Hooke’s law 42. Core shrinkage during drying affects: (A) Permeability measurements (B) Grain density only (C) Rock color (D) None of the above 43. Which test determines pore size distribution using air–mercury contact? (A) Helium porosimetry (B) Mercury intrusion test (C) Capillary rise method (D) Gas expansion test 44. Which factor reduces effective porosity? (A) Clay content blocking pore throats (B) Larger pore throats (C) Better grain sorting (D) High connectivity 45. Which is NOT a step in routine core analysis? (A) Porosity measurement (B) Permeability measurement (C) Resistivity measurement (D) Seismic reflection test 46. Core flooding is performed under: (A) Reservoir temperature and pressure conditions (B) Room temperature only (C) Atmospheric pressure only (D) Laboratory heating only 47. What is connate water? (A) Water originally present in reservoir rock pores (B) Water injected during flooding (C) Surface water near drilling sites (D) Distilled water used in labs 48. A reservoir with both oil and gas present is called: (A) Gas cap reservoir (B) Wet gas reservoir (C) Condensate reservoir (D) Oil rim reservoir 49. The porosity calculated using grain and bulk density is called: (A) Density porosity (B) Neutron porosity (C) Acoustic porosity (D) Resistivity porosity 50. Why is core analysis important for reservoir simulation? (A) Provides accurate input rock and fluid parameters (B) Replaces seismic surveys (C) Eliminates drilling (D) Removes need for logging FOUNDATIONAL SUBJECTS (Year 1 – Year 2)Engineering Mechanics (Statics & Dynamics) – MCQsFluid Mechanics – MCQsThermodynamics – MCQsComputer Programming (e.g., MATLAB, Python) – MCQsIntroduction to Engineering – MCQsGeology for Engineers – MCQsTechnical Communication – MCQs CORE PETROLEUM ENGINEERING SUBJECTS (Year 2 – Year 4)Introduction to Petroleum Engineering – MCQsPetroleum Geology – MCQsDrilling Engineering – MCQsReservoir Engineering – MCQsProduction Engineering – MCQsPetroleum Fluid Properties – MCQsWell Logging and Formation Evaluation – MCQsPetroleum Economics – MCQsPetroleum Refining and Processing – MCQs Natural Gas Engineering – MCQsEnhanced Oil Recovery (EOR) – MCQsWell Testing – MCQsReservoir Simulation – MCQsDrilling Fluids and Cementing – MCQsOffshore Petroleum Engineering – MCQsHealth, Safety and Environment (HSE) – MCQsPetroleum Project Management – MCQsCorrosion Engineering – MCQsArtificial Lift Techniques – MCQsPetrophysics – MCQs LABORATORIES & PRACTICALS (Theory-based MCQs can be made from these)Drilling Fluids Lab – MCQsCore Analysis Lab – MCQsReservoir Simulation Lab – MCQsRock and Fluid Properties Lab – MCQsWell Logging Lab – MCQs ELECTIVES (Optional/Advanced)Energy Transition and Sustainability – MCQsUnconventional Resources (Shale, Tight Gas, etc.) – MCQsData Analytics in Petroleum Engineering – MCQsGeographic Information Systems (GIS) – MCQsPetroleum Law and Policy – MCQsPipeline Engineering – MCQsRenewable Energy Integration – MCQs