24-Pet-B1 Natural Gas Engineering
Worked solutions to 6 past sittings (2014–2019), 65 questions. Pick a sitting, or start from a topic below.
Topics across the sittings
Topics that come up in more than one sitting, taken from the headings of our worked solutions. A topic counts once per sitting.
- Neutron-Density Porosity (4 sittings): December 2019 Q7 · December 2016 Q8 · December 2015 Q7 · Undated paper Q7
- Nonideal Shale Membranes (4 sittings): December 2019 Q10 · December 2016 Q9 · December 2015 Q10 · Undated paper Q10
- Acoustic Properties of Rocks (3 sittings): December 2016 Q1 · December 2015 Q1 · Undated paper Q1
- ESSP for Ideal (3 sittings): December 2019 Q10 · December 2015 Q10 · Undated paper Q10
- Fluid Typing (3 sittings): December 2019 Q8 · December 2015 Q8 · Undated paper Q8
- Gamma Ray (3 sittings): December 2019 Q9 · December 2015 Q9 · Undated paper Q9
- Gamma-Ray Crossplot (3 sittings): December 2016 Q7 · May 2016 Q11 · Undated paper Q8
- Invasion-Related Definitions (3 sittings): December 2019 Q3 · December 2015 Q3 · Undated paper Q3
- Shale Volume from SP (3 sittings): December 2019 Q9 · December 2015 Q9 · Undated paper Q9
- Zone A (3 sittings): December 2019 Q9 · December 2015 Q9 · Undated paper Q9
- Assumptions of Conventional Log-Interpretation Techniques (2 sittings): December 2019 Q4 · December 2015 Q4
- Ideal (2 sittings): May 2016 Q12 · May 2014 Q12
- Invasion profiles (2 sittings): December 2016 Q2 · May 2014 Q1
- Limitations of the Hingle Plot (2 sittings): May 2016 Q5 · May 2014 Q5
- Minimum Productive Resistivity (2 sittings): May 2016 Q9 · May 2014 Q9
Questions by sitting
December 2019
- Question 1: Porosity Tools and Acoustic-Property Applications
- Question 2: Gamma Ray Log Character by Lithology
- Question 3: Invasion-Related Definitions
- Question 4: Assumptions of Conventional Log-Interpretation Techniques
- Question 5: Types of Neutron Detectors
- Question 6: Radioisotopes Detected by Spectral Gamma Ray
- Question 7: Neutron-Density Porosity and Sxo in a Gas Sand
- Question 8: Density-Neutron Crossplot and Fluid Typing
- Question 9: Shale Volume from SP and Gamma Ray, Zone A
- Question 10: ESSP for Ideal and Nonideal Shale Membranes
December 2016
- Question 1: Acoustic properties of rocks
- Question 2: Invasion profiles — transition and annulus zones
- Question 3: Gamma-ray log — lithology zonation
- Question 4: SSP for a clean water-bearing sand
- Question 5: Mud-invasion terminology
- Question 6: Spectral GR, reflected-wave amplitude, and attenuation
- Question 7: (φ_N−φ_D) vs. gamma-ray crossplot — zone identification
- Question 8: Neutron-density porosity and S_xo in a gas sand
- Question 9: ESSP with an ideal and a nonideal shale membrane
- Question 10: Shale index from GR vs. spectral log; apparent/true porosity in an oil-bearing limestone
- Question 11: SP- and GR-derived shale content, offshore Louisiana IES/FDC log
May 2016
- Question 1: Neutron Detectors and the Static SP
- Question 2: Characteristics that Affect Log Quality
- Question 3: Borehole-Diameter Effect on a 19½-in GNT Tool
- Question 4: Porosity-Log Response in Gas-Bearing Formations
- Question 5: Limitations of the Hingle Plot
- Question 6: Caliper Response and Spectral Gamma-Ray Isotopes
- Question 7: Order of Magnitude of the SNP Panel Correction
- Question 8: Interpreting the SP and Gamma-Ray Deflections
- Question 9: Water-Saturation Cutoff and Minimum Productive Resistivity
- Question 10: Humble Porosity and Hydrocarbon Saturation from a Core Sample
- Question 11: Neutron–Density versus Gamma-Ray Crossplot and the Fluid Type of Zones F and G
- Question 12: Ideal and Nonideal Shale-Membrane SP
December 2015
- Question 1: Acoustic Properties of Rocks
- Question 2: Gamma Ray Log Character by Lithology
- Question 3: Invasion-Related Definitions
- Question 4: Assumptions of Conventional Log-Interpretation Techniques
- Question 5: Types of Neutron Detectors
- Question 6: Radioisotopes Detected by Spectral Gamma Ray
- Question 7: Neutron-Density Porosity and Sxo in a Gas Sand
- Question 8: (φ N −φ D )-vs-Gamma-Ray Crossplot and Fluid Typing
- Question 9: Shale Volume from SP and Gamma Ray, Zone A
- Question 10: ESSP for Ideal and Nonideal Shale Membranes
May 2014
- Question 1: Resistivity of a Log and Invasion Profiles
- Question 2: Factors Affecting Log Quality
- Question 3: Sources of Spontaneous Potential
- Question 4: Porosity-Log Response in Gas-Bearing Formations
- Question 5: Limitations of the Hingle Plot
- Question 6: Caliper-Derived Borehole Shape and Spectral Gamma Ray
- Question 7: SNP Environmental Correction, Order of Magnitude
- Question 8: SP/GR Lithology and Fluid-Resistivity Comparison
- Question 9: Water-Saturation Cutoff and Minimum Productive Resistivity
- Question 10: Humble's Correlation and Hydrocarbon Saturation vs. Depth
- Question 11: Recoverable Oil from ISF/Sonic and CNL/FDC Logs
- Question 12: Static SP — Ideal and Non-Ideal Shale Membrane
Undated paper
- Question 1: Acoustic Properties of Rocks
- Question 2: Borehole Cross-Section from a Two-Arm Caliper Log
- Question 3: Invasion-Related Definitions
- Question 4: Transition and Annulus Invasion Profiles
- Question 5: Factors Affecting Log Resistivity
- Question 6: Characteristics Affecting Log Quality
- Question 7: Neutron-Density Porosity and S xo in a Gas Sand
- Question 8: Neutron–Density versus Gamma-Ray Crossplot and Fluid Typing
- Question 9: Shale Volume from SP and Gamma Ray, Zone A
- Question 10: ESSP for Ideal and Nonideal Shale Membranes