Petrophysics – MCQs 50 Score: 0 Attempted: 0/50 Subscribe 1. Petrophysics is primarily concerned with: (A) Surface geology (B) Subsurface rock and fluid properties (C) Drilling operations (D) Refinery processes 2. The main objective of petrophysics is to determine: (A) Refining efficiency (B) Wellbore stability (C) Hydrocarbon presence and producibility (D) Drilling mud type 3. The three fundamental rock properties in petrophysics are: (A) Porosity, permeability, saturation (B) Stress, strain, fracture toughness (C) Density, viscosity, compressibility (D) Grain size, shape, color 4. Porosity is defined as the ratio of: (A) Pore volume to bulk volume (B) Grain volume to bulk volume (C) Fluid volume to grain volume (D) Matrix volume to fluid volume 5. Effective porosity excludes: (A) Connected pores (B) Isolated pores (C) Total pore volume (D) Fluid volume 6. The unit of permeability is: (A) Darcy (B) Pascal (C) Poise (D) Newton 7. Which law describes fluid flow through porous media? (A) Boyle’s law (B) Darcy’s law (C) Newton’s law (D) Pascal’s law 8. Water saturation (Sw) represents the fraction of pore space filled with: (A) Oil (B) Gas (C) Water (D) Hydrocarbons 9. Archie’s equation is used to calculate: (A) Rock strength (B) Formation resistivity factor (C) Permeability (D) Porosity 10. The cementation exponent in Archie’s equation is usually in the range: (A) 0.5–1.0 (B) 1.5–2.5 (C) 2.5–3.5 (D) 3.5–4.5 11. Core analysis provides direct measurements of: (A) Rock and fluid properties (B) Drilling torque (C) Mud circulation (D) Cement bond quality 12. Log-derived porosity is obtained from: (A) Neutron, density, sonic logs (B) Resistivity logs (C) Mud logging (D) Temperature logs 13. Resistivity logs are primarily used to estimate: (A) Fluid density (B) Water saturation (C) Rock strength (D) Gas compressibility 14. Gas-bearing formations usually show: (A) High neutron porosity (B) Low density log response (C) High gamma-ray response (D) High sonic transit time 15. Gamma-ray logs are mainly used to measure: (A) Formation permeability (B) Formation lithology (shale content) (C) Formation pressure (D) Hydrocarbon viscosity 16. Sonic logs measure: (A) Acoustic velocity of rock (B) Porosity directly (C) Hydrocarbon content (D) Resistivity 17. The formation volume factor (Bo) relates: (A) Oil volume at reservoir and surface conditions (B) Gas volume to oil volume (C) Water volume to pore volume (D) Porosity to permeability 18. Shale effect on resistivity logs is corrected using: (A) Archie’s law (B) Dual-water model (C) Boyle’s law (D) Darcy’s law 19. Capillary pressure curves are used to determine: (A) Relative permeability (B) Fluid distribution in reservoir (C) Formation strength (D) Temperature gradient 20. The term “irreducible water saturation” refers to: (A) Maximum water saturation (B) Water trapped in small pores (C) Water saturation after waterflooding (D) Free water production 21. Relative permeability is defined as: (A) Ratio of fluid viscosity to porosity (B) Fractional permeability to a single phase (C) Absolute permeability of rock (D) Effective porosity measurement 22. NMR logs measure: (A) Rock mineralogy (B) Pore size distribution and fluid typing (C) Hydrocarbon composition (D) Acoustic impedance 23. Wettability affects: (A) Rock compressibility (B) Fluid distribution in pores (C) Formation pressure (D) Cap rock sealing capacity 24. A highly water-wet reservoir generally shows: (A) Low irreducible water saturation (B) High irreducible water saturation (C) No water production (D) High hydrocarbon saturation always 25. The density log tool responds primarily to: (A) Formation hydrogen concentration (B) Electron density of rock matrix (C) Fluid viscosity (D) Acoustic impedance 26. Effective stress in a reservoir is calculated as: (A) Total stress minus pore pressure (B) Pore pressure plus lithostatic stress (C) Shear stress minus fluid pressure (D) Capillary pressure minus overburden 27. The spontaneous potential (SP) log indicates: (A) Rock strength (B) Permeability and formation water salinity (C) Hydrocarbon viscosity (D) Rock density 28. A typical value of porosity in a sandstone reservoir is: (A) 1–5% (B) 5–10% (C) 15–30% (D) 40–60% 29. Gas reservoirs usually show which log crossover? (A) Neutron above density log (B) Density above neutron log (C) Sonic above gamma-ray log (D) Resistivity below gamma-ray log 30. Shale content is quantified using: (A) Neutron logs (B) Gamma-ray logs (C) Resistivity logs (D) Sonic logs 31. The Archie’s water saturation equation is: (A) Sw = (aRw / φ^m Rt)^(1/n) (B) Sw = φ × Rt × Rw (C) Sw = Bo / Rs (D) Sw = K × φ / μ 32. Resistivity of formation water decreases with: (A) Increasing temperature (B) Increasing pressure (C) Decreasing salinity (D) Increasing porosity 33. The primary purpose of cased-hole logging is: (A) Rock strength determination (B) Fluid saturation monitoring after completion (C) Well trajectory correction (D) Surface pipeline inspection 34. The capillary pressure curve is shifted to higher pressures when rock has: (A) Larger pore throats (B) Smaller pore throats (C) Lower porosity (D) Higher permeability 35. A common laboratory test for permeability is the: (A) Triaxial compression test (B) Steady-state core flooding (C) Gamma-ray spectroscopy (D) Neutron scattering 36. Residual oil saturation refers to: (A) Oil remaining after primary recovery (B) Oil trapped by capillary forces (C) Oil dissolved in water (D) Oil that cannot be refined 37. Shaly sand interpretation models include: (A) Archie’s model (B) Dual-water model (C) Simandoux model (D) Both B and C 38. Porosity calculated from sonic logs uses: (A) Wyllie time-average equation (B) Archie’s law (C) Darcy’s law (D) Reynolds equation 39. Formation resistivity factor (F) is defined as: (A) Rw / Rt (B) Rt / Rw (C) a / φ^m (D) Sw × Rt 40. The pressure at which gas begins to come out of solution in oil is called: (A) Dew point pressure (B) Bubble point pressure (C) Critical pressure (D) Capillary entry pressure 41. Core plugs are usually taken in sizes of: (A) 0.5–1 inch diameter (B) 1–1.5 inch diameter (C) 1.5–2.5 inch diameter (D) 3–4 inch diameter 42. Relative permeability curves are measured in: (A) Sonic log tests (B) Core flooding experiments (C) Resistivity logs (D) Gamma-ray logs 43. In petrophysics, “matrix density” usually refers to: (A) Grain density of the rock (B) Fluid density (C) Bulk density of rock-fluid system (D) Electron density only 44. NMR log T2 distribution is related to: (A) Porosity only (B) Pore size distribution (C) Hydrocarbon viscosity only (D) Resistivity index 45. Formation evaluation integrates data from: (A) Core, log, and test data (B) Seismic only (C) Mud logs only (D) Surface facilities only 46. The bulk volume of a reservoir rock is: (A) Grain volume + pore volume (B) Grain volume only (C) Pore volume only (D) Fluid volume only 47. A typical permeability value for a good sandstone reservoir is: (A) 0.01–0.1 mD (B) 0.1–10 mD (C) 50–500 mD 48. Cementation factor in Archie’s law accounts for: (A) Pore connectivity and tortuosity (B) Rock density (C) Grain size (D) Pressure effects 49. Water resistivity (Rw) is usually determined from: (A) Mud logging (B) SP log or water samples (C) Gamma-ray log (D) Seismic inversion 50. The ratio of hydrocarbon pore volume to bulk rock volume is known as: (A) Effective porosity (B) Net-to-gross ratio (C) Hydrocarbon pore volume fraction (D) Hydrocarbon saturation × porosity 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