Well-log Principles and Tools - Petroleum Formation Evaluation - Petroleum Engineering Previous Year Questions

1

2016 · Petroleum Engineering · Petroleum Formation Evaluation · Well-log Principles and Tools

Petroleum Engineering (PE) 2016

Which of the following is preferred fast neutron source in neutron logging?

A

Americium-Beryllium

B

Radium-Beryllium

C

Deuterium-Tritium

D

Thorium-Beryllium

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2

2016 · Petroleum Engineering · Petroleum Formation Evaluation · Well-log Principles and Tools

Petroleum Engineering (PE) 2016

Identify the logging device that is based on the concept of longitudinal and transverse relaxation times.

A

Thermal neutron decay

B

Induced gamma ray spectroscopy

C

Neutron

D

Nuclear Magnetic Resonance (NMR)

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3

2016 · Petroleum Engineering · Petroleum Formation Evaluation · Well-log Principles and Tools

Petroleum Engineering (PE) 2016

In sonic logging, the sonic velocities in the formation and drilling mud are 50,000 ft/s and 500 ft/s, respectively.
The critical angle is _____ radians.

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4

2017 · Petroleum Engineering · Petroleum Formation Evaluation · Well-log Principles and Tools

Petroleum Engineering (PE) 2017

Match the following:
(P) Gamma ray log
(Q) Resistivity log
(R) Cement bond log
(S) NMR log

(I) Water saturation
(II) Acoustic waves
(III) Permeability
(IV) Lithology

A

P-IV, Q-I, R-II, S-III

B

P-I, Q-II, R-III, S-IV

C

P-I, Q-III, R-II, S-IV

D

P-IV, Q-II, R-I, S-III

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5

2018 · Petroleum Engineering · Petroleum Formation Evaluation · Well-log Principles and Tools

Petroleum Engineering (PE) 2018

Which one of the following options represents the correct sequence of arrival of acoustic wave energy recorded in a sonic log?

A

shear, surface, compressional

B

compressional, shear, surface

C

surface, shear, compressional

D

compressional, surface, shear

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6

2021 · Petroleum Engineering · Petroleum Formation Evaluation · Well-log Principles and Tools

Petroleum Engineering (PE) 2021

Match the following wire-line logging methods (GROUP I) based on the physical principles of measurements (GROUP II).

GROUP I	GROUP II
(P) Induction Log	(I) Measures natural radioactivity of a formation.
(Q) Gamma-Ray Log	(II) Measures induced magnetic moment of hydrogen nuclei (protons).
(R) Sonic Log	(III) Measures electrical resistivity/conductivity.
(S) Nuclear Magnetic Resonance Log	(IV) Measures elastic wave propagation properties.

A

P – II, Q – I, R – IV, S – III

B

P – III, Q – I, R – IV, S – II

C

P – III, Q – II, R – IV, S – I

D

P – II, Q – I, R – III, S – IV

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7

2022 · Petroleum Engineering · Petroleum Formation Evaluation · Well-log Principles and Tools

Petroleum Engineering (PE) 2022

The logging tool(s) preferred for the measurement of formation resistivity in a well drilled with oil-based mud is/are

A

Dual Laterolog

B

Compensated Neutron Log

C

Compensated Density Log

D

Induction Log

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8

2024 · Petroleum Engineering · Petroleum Formation Evaluation · Well-log Principles and Tools

Petroleum Engineering (PE) 2024

Shear wave velocity (\( V_s \)) in a limestone formation is 3600 m/s. Assume that the modulus of incompressibility (\( K \)) is twice that of the modulus of rigidity (\( G \)), and the bulk density (\( \rho_b \)) of the formation is 2700 kg/m³.
For this limestone formation, the compressional wave velocity (\( V_p \)) is ________ m/s.

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9

2024 · Petroleum Engineering · Petroleum Formation Evaluation · Well-log Principles and Tools

Petroleum Engineering (PE) 2024

The decay of Gamma ray energy in the Earth formation goes through three dominant processes represented by regions I, II, and III in the figure below. Which ONE of the following options is CORRECT?

A

I – Photoelectric effect; II – Pair production effect; III – Compton effect

B

I – Epithermal effect; II – Pair production effect; III – Photoelectric effect

C

I – Photoelectric effect; II – Compton effect; III – Pair production effect

D

I – Epithermal effect; II – Photoelectric effect; III – Compton effect

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10

2025 · Petroleum Engineering · Petroleum Formation Evaluation · Well-log Principles and Tools

Petroleum Engineering (PE) 2025

Which ONE of the following rocks shows the highest reading in the natural gamma ray log?

A

Dolomite

B

Anhydrite

C

Oil Shale

D

Limestone

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11

2025 · Petroleum Engineering · Petroleum Formation Evaluation · Well-log Principles and Tools

Petroleum Engineering (PE) 2025

Match the well logging methods in GROUP I with their corresponding measured parameters in GROUP II.

GROUP I	GROUP II
(P) Neutron log	(I) Resistivity in the flushed/invaded zone
(Q) Density log	(II) Hydrogen ion concentration in the formation
(R) Microspherically Focused Log (MSFL)	(III) Interval transit time of a compressional wave
(S) Sonic log	(IV) Electron density of the formation

A

P – IV; Q – I; R – II; S – III

B

P – II; Q – IV; R – I; S – III

C

P – II; Q – III; R – IV; S – I

D

P – III; Q – IV; R – I; S – II

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12

2023 · Petroleum Engineering · Petroleum Formation Evaluation · Well-log Principles and Tools

Petroleum Engineering (PE) 2023

Which of the following is necessary for the generation of electrokinetic potential across well-bore and permeable rock formation?

A

Salinity gradient

B

Pressure gradient

C

Shale membrane

D

Mud cake

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13

2023 · Petroleum Engineering · Petroleum Formation Evaluation · Well-log Principles and Tools

Petroleum Engineering (PE) 2023

A compressional acoustic wave takes 55 μs to travel 0.3048 m through a rock formation having bulk modulus of 37.5 GPa and shear modulus of 31 GPa. The bulk density of the rock is ______ kg/m³ (rounded to two decimal places).

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14

2026 · Petroleum Engineering · Petroleum Formation Evaluation · Well-log Principles and Tools

Petroleum Engineering (PE) 2026

Which of the following “logging methods” in a borehole will provide the highest depth of investigation for a given marine formation?

A

Neutron

B

Sonic

C

Density

D

Resistivity

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15

2026 · Petroleum Engineering · Petroleum Formation Evaluation · Well-log Principles and Tools

Petroleum Engineering (PE) 2026

Which of the following approaches is/are used to get the response of Formation Micro Scanner (FMS) log?

A

Optical

B

Electrical

C

Thermal

D

Nuclear

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