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18-Geol-A7 Applied Geophysics: December 2017

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Density — Values, Gravity Contrast, and Seismic Velocity/Reflectivity
  2. Question 2 Seismic Refraction Survey Design, Execution and Interpretation
  3. Question 3 Planning, Acquiring, Processing and Interpreting a Magnetotelluric (MT) Survey
  4. Question 4 Resistivity Survey Arrays — Configuration, Strengths/Weaknesses, and a Case History
  5. Question 5 Chargeability — Mechanisms, Measurement, and a Case History
  6. Question 6 Magnetic Anomaly Dependence on Magnetic Latitude and Reduction Methods
  7. Question 7 Displaying and Enhancing Geophysical Data
  8. Question 8 Three Geophysical Well-Logging Tools
  9. Question 9 An Electromagnetic (EM) System in Detail
  10. Question 10 Forward and Inverse Modelling in Quantitative Geophysical Interpretation

Start with Question 1 →

National Exams — December 2017 — 04-Geol-A7 Applied Geophysics. Three-hour, closed-book exam; approved Casio or Sharp calculator permitted. The paper offers a choice of six of the following ten questions, each worth 16.66% of the total mark, and every question requires an essay-format answer — this is a genuinely all-essay sitting with no numeric data, formula sheet, or figure supplied. All ten questions are answered below so the set stands as a complete study resource.

Reference texts: Telford, Geldart & Sheriff, Applied Geophysics (2nd ed.) — the primary reference for every method touched in this paper (density/rock physics, seismic refraction, magnetotellurics, resistivity, induced polarization, magnetics, data enhancement, well logging, EM systems, forward/inverse modelling); Kearey, Brooks & Hill, An Introduction to Geophysical Exploration (3rd ed.) — survey planning, array geometry, data display; Simpson & Bahr, Practical Magnetotellurics — MT acquisition/processing (Q3); Blakely, Potential Theory in Gravity and Magnetic Applications — potential-field forward/inverse modelling (Q6, Q10); Selley & Sonnenberg, Elements of Petroleum Geology — well-logging tool context (Q8).