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24-Pet-B1 Natural Gas Engineering: December 2016

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

  1. Question 1 Acoustic properties of rocks
  2. Question 2 Invasion profiles — transition and annulus zones
  3. Question 3 Gamma-ray log — lithology zonation
  4. Question 4 SSP for a clean water-bearing sand
  5. Question 5 Mud-invasion terminology
  6. Question 6 Spectral GR, reflected-wave amplitude, and attenuation
  7. Question 7 (φ_N−φ_D) vs. gamma-ray crossplot — zone identification
  8. Question 8 Neutron-density porosity and S_xo in a gas sand
  9. Question 9 ESSP with an ideal and a nonideal shale membrane
  10. Question 10 Shale index from GR vs. spectral log; apparent/true porosity in an oil-bearing limestone
  11. Question 11 SP- and GR-derived shale content, offshore Louisiana IES/FDC log

Start with Question 1 →

National Exams — December 2016. 98-Pet-B1, Well Logging and Formation Evaluation (every question is log-interpretation content, not gas-engineering material). 3-hour closed-book exam, 11 questions, all marked, calculators and attached graphs/formula sheet permitted.

Reference texts: Bassiouni, Theory, Measurement, and Interpretation of Well Logs (SPE Textbook Series Vol. 4); Asquith & Krygowski, Basic Well Log Analysis, 2nd ed.; Ellis & Singer, Well Logging for Earth Scientists, 2nd ed.; Schlumberger, Log Interpretation Charts.

Check: Q3, Q7, Q8, Q9(b), Q10 and Q11 are built on the paper's printed logs and attached charts. Values printed as annotations on the logs (Q11's SSP, PSP and GR labels) are used exactly as printed. Values read off a curve or a chart (Q9(b) and the Q8 chart check, Q10's track readings) are read from the printed figure and flagged inline with their precision. All arithmetic that follows is exact.