wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

well log final

Total questions: 51

Worksheet time: 26mins

Name
Class
Date
1.

For a gas-bearing sandstone formation, which correction factor should be applied to the porosity calculated using Wyllie's time-average equation?

a)

Multiply porosity by 0.5

b)

Multiply porosity by 0.7

c)

Multiply porosity by 0.9

d)

Divide porosity by 1.2

e)

Multiply porosity by 0.3

2.

According to Archie's law, the formation resistivity factor FR is expressed as:

a)

FR=фm*Rw

b)

FR=Rt/Rw

c)

FR=a/фm

d)

FR=Swn*Ro

e)

FR=ф*Rw/Rt

3.

PEF is more sensitive than density to presence of barite in mud

a)

True

b)

False

4.

Which of the following logs SHOULD NOT be run in the presence of an OBM

a)

PEF

b)

Neutron

c)

Density

d)

None

5.

How does the NMR log's T2 distribution improve porosity estimation in a heterogeneous carbonate reservoir compared to density or neutron logs?

a)

It measures resistivity variations, providing more accurate lithology data

b)

It distinguishes between total and effective porosity, capturing BWI and FFI

c)

It calculates acoustic velocity, improving porosity in fractured zones

d)

It detects gamma ray emissions, refining porosity in shaly zones

e)

It estimates borehole rugosity, correcting porosity measurements

6.

What does M represent?

a)

M is the open fracture

b)

M is the plane

c)

M is the cemented fracture

d)

M is the small-scale fault

e)

Conductive feature

7.

How does the presence of gas in a formation affect the neutron porosity log?

a)

Increases porosity due to higher hydrogen concentration

b)

Decreases porosity due to lower hydrogen concentration

c)

No effect, as gas has the same hydrogen index as water

d)

Causes erratic readings due to neutron scattering

e)

Increases porosity only in carbonate formations

8.

Which type of formation is typically associated with low gamma ray readings in Spectral Gamma Ray Logs?

a)

Sandstone

b)

Shale

c)

Limestone

d)

Coal

9.

Which technique is used to measure the acoustic properties of a formation?

a)

Sonic logging

b)

Nuclear magnetic resonance logging

c)

Dielectric logging

d)

Acoustic impedance logging

10.

Which of the following logs is most affected by borehole salinity?

a)

Neutron log

b)

Gamma ray log

c)

Density log

d)

Caliper log

e)

SP log

11.

A Pickett plot (log-log plot of resistivity vs. porosity) is primarily used to:

a)

Determine (m) and water resistivity (Rw)

b)

Calculate hydrocarbon saturation (Sh) using Archie's equation

c)

Identify the position of the free water level (FWL)

d)

Differentiate between gas and oil zones

e)

Estimate permeability from core data

12.

Which gamma-ray interaction mechanism is primarily utilized in density logging, and in what energy range does it predominantly occur?

a)

Pair Production (>10 MeV)

b)

Photoelectric Absorption (<100 keV)

c)

Nuclear Absorption (200 keV-500 keV)

d)

Elastic Scattering (>1 MeV)

e)

Compton Scattering (75 keV to 10 MeV)

13.

A combination of neutron and density logs can be utilized to detect the presence of irreducible water saturation in a hydrocarbon-bearing sand

a)

True

b)

False

14.

Which of the following would normally have the greatest resistivity?

a)

Shale

b)

Solid granite

c)

Fractured dolomite

d)

Sandstone

15.

In the SP log, what does a positive deflection usually indicate in freshwater mud systems?

a)

Shale

b)

Gas zone

c)

Permeable sandstone

d)

Tight carbonate

e)

Oil-bearing limestone

16.

Which technique is used to determine the resistivity of a formation by measuring the electromagnetic response to induced currents?


a)

Induction logging

b)

Dielectric logging

c)

Sonic logging

d)

Nuclear logging

17.

What is the primary objective of image logging?

a)

Assessing formation pressure

b)

Evaluating borehole stability

c)

Structural analysis

d)

Measuring formation permeability

18.

What is the term used to describe the time it takes for the protons to return to their original state after excitation?

a)

Relaxation time

b)

Acquisition time

c)

Pulse sequence

d)

Spin echo

19.

In mudlog interpretation, what does the following stands for?GYTAN SDY TR CALCITE

a)

Granular yellowish-tan sandy trace calcite

b)

Grayish-tan silty trace calcite

c)

Grayish-tan sandy trace calcite

d)

Greenish-yellow tertiary calcareous sands

e)

Graded yellowish-tan shale with calcite veins

20.

What does a resistivity log primarily indicate?

a)

Formation pressure

b)

Porosity

c)

Lithology

d)

Fluid saturation

21.

Which formula correctly expresses the relationship between Young's modulus (E), shear modulus (G), and Poisson's ratio (μ)?

a)

G=3(1-2μ)E

b)

μ=E2G-1μ=2GE-1

c)

E=G(1+μ)

d)

G=2(1+μ)E

e)

G=μE

22.

What log type is best for identifying lithology boundaries?

a)

Caliper

b)

Neutron

c)

Gamma ray

d)

Sonic

e)

Induction

23.

How is the neutron porosity log (NPOR) used to estimate porosity in a sandstone reservoir, and what is a key limitation in its interpretation?

a)

It measures gamma ray emissions to calculate porosity, limited by borehole rugosity

b)

It detects hydrogen content to estimate porosity. limited by gas effects

c)

It calculates acoustic transit time for porosity, limited by fracture presence

d)

It measures formation resistivity for porosity. limited by fluid salinity

e)

It estimates bulk density for porosity, limited by clay content

24.

From which of the following logs Rxo can be identified

a)

MSFL

b)

ILD

c)

LLD

d)

RHOB

e)

DRHO

25.

What usually is the chemical source for Neutron log?

a)

A mixture of americium and beryllium

b)

Pure uranium core sealed in a lead container

c)

Cesium-137 mixed with sodium chloride

d)

A combination of gamma-emitting isotopes

e)

Natural hydrogen stored in pressurized chambers

26.

A photoelectric factor (PEF) log measures a value of 5.1. Which lithology is most likely present?

a)

Sandstone

b)

Shale

c)

Limestone

d)

Dolomite

e)

Anhydrite

27.

In well logging, what is the main application of the sonic log?

a)

To measure the formation's resistivity to electrical current

b)

To estimate the formation's mechanical properties and porosity

c)

To detect the presence of hydrocarbons through fluorescence

d)

To measure the formation's natural radioactivity

e)

To determine the well's temperature profile

28.

Which sonic tool configuration uses two transmitters and four receivers to automatically compensate for borehole size variations and tool misalignment?

a)

Single-Receiver System

b)

Dual-Receiver System

c)

Borehole Compensated Tool

d)

Long-Spacing Sonic Tool

e)

Piezoelectric Transmitter Array

29.

Apply the time-average equation to calculate porosity from acoustic transit time. Question: Using the time-average equation, what is the porosity of a sandstone formation with a transit time (AtAt) of 70 usec/ft? Assume Atma=55.5Atma=55.5 usec/ft (sandstone) and Atf=189 usec/ft (fluid).

a)

8%

b)

22%

c)

15%

d)

18%

e)

11%

30.

Which log is most reliable in air-filled boreholes for resistivity measurement?

a)

Laterolog

b)

Induction log

c)

Microresistivity log

d)

Neutron log

e)

Gamma ray log

31.

Which technique involves analyzing the petrophysical properties of rock samples obtained from the reservoir?

a)

Well logging

b)

Core analysis

c)

Formation testing

d)

Image logging

32.

What information can be inferred from borehole imaging data?

a)

Casing integrity 

b)

Fluid composition

c)

Rock porosity and permeability

d)

Only borehole diameter

33.

What is the typical unit of measurement for resistivity log readings?

a)

Ohm-meters 

b)

Millivolts

c)

Microcuries

d)

Percent

34.

In log interpretaion which of the following act as insulators

a)

All of the above

b)

hydrocarbons

c)

rocks

d)

fresh water

e)

formation

35.

What is Zonation?

a)

Identifying the mineral composition of the formation

b)

The process of measuring resistivity variations in a well

c)

Determining the porosity and permeability of formation layers

d)

Classifying formation pressure into distinct groups

e)

Defining intervals of similar lithologic and fluid properties

36.

Which parameter in Archie's equation adjusts for pore complexity?

a)

a (tortuosity factor)

b)

m (cementation exponent)

c)

n (saturation exponent)

d)

Rt (true resistivity)

e)

Rw (formation water resistivity)

37.

In advanced well logging, what is the significance of the shear wave anisotropy measured by a dipole sonic tool?

a)

It indicates the formation's natural radioactivity and clay content

b)

It measures the electrical conductivity of the formation fluids It provides

c)

It provides insights into formation stress and fracture orientation

d)

It estimates the bulk density of the formation

e)

It determines the borehole diameter and rugosity

38.

A density log records a bulk density of 2.32 g/cm' in a sandstone formation. Assuming a matrix density of 2.65 g/cm3 and fluid density of 0.1 g/cm3 (gas), what| is the porosity?

a)

15%

b)

5%

c)

20%

d)

25%

e)

30%

39.

In the context of nuclear magnetic resonance (NMR) logging, what does the T2 relaxation time distribution primarily indicate about the formation?

a)

The formation's natural gamma ray emission level 

b)

The electrical resistivity of the formation fluids

c)

The pore size distribution and fluid mobility

d)

The acoustic impedance of the formation

e)

The thermal gradient within the formation

40.

What is the difference between the Free-fluid (Coates) and SDR model

a)

Coates uses a resistivity index, while SDR uses acoustic velocity

b)

Coates uses a ratio of FFI to BVI, SDR uses the geometric mean of T2

c)

Coates is used only for shaly sands, whereas SDR applies to carbonate formations

d)

Coates calculates permeability directly, while SDR estimates porosity

e)

Coates applies a pressure correction factor, SDR does not

41.

How does the NMR log’s T2 distribution improve porosity estimation in a heterogeneous carbonate reservoir compared to density or neutron logs?

a)

  1. It measures resistivity variations

b)

  1. It distinguishes between total and effective porosity (BVI/FFI)

c)

  1. It calculates acoustic velocity

d)

It detects gamma ray emissions

e)

  1. It estimates borehole rugosity

42.

When resistivity logs are used in a water-bearing zone, what is the relationship between the resistivity of the uninvaded zone (Rt), invaded zone (Ri), and flushed zone (Rxo)?

a)

  1. Rt = Ri = Rxo

b)

  1. Rxo > Ri > Rt

c)

Rt > Ri > Rxo

d)

  1. Rt > Rxo > Ri

e)

  1. Ri > Rxo > Rt

43.

  1. Which of the following logs is least affected by borehole washouts?

a)

Gamma ray

b)

  1. Density

c)

  1. PEF

d)

  1. Neutron

e)

  1. Caliper

44.

  1. A gamma ray log shows a consistent reading of 130 API in a certain zone. What does this most likely indicate?

a)

  1. Clean sandstone

b)

Shale formation

c)

  1. Salt dome

d)

  1. Fractured carbonate

e)

  1. Brine-filled zone

45.

What is the typical unit of measurement for SP log readings?

a)

Millivolts

b)

Ohm-meters

c)

Microcuries

d)

API

e)

Percent

46.

What does the DPHI log measure?

a)

Density

b)

Porosity

c)

Fluid saturation

d)

Permeability

e)

Formation pressure

47.

  1. What is the primary use of borehole imaging in subsurface evaluation?

a)

  1. Determining formation fluid types and viscosities

b)

Mapping subsurface fractures, bedding, and sedimentary features

c)

Measuring the porosity and permeability of reservoir rocks

d)

Assessing borehole temperature and pressure gradients

e)

Identifying casing wear and corrosion in well completions

48.

Which log is most reliable in air-filled boreholes for resistivity measurement?

a)

Microresistivity log

b)

Laterolog

c)

Induction log

d)

Gamma ray log

e)

Neutron log

49.

  1. Which of the following minerals will have a measurable impact on the neutron log in the presence of otherwise clean sands?

a)

barrium and phosphorous

b)

illite and chlorite

c)

calcium and chlorite

d)

bromium and uranium

50.

  1. There are known effects of gas on logging tool responses. Which of the following statements is correct?

a)

Sonic log porosities are reduced by gas

b)

Neutron log porosities are increased by gas

c)

Neutron log porosities are decreased by gas

d)

Density log porosities are not affected by gas

e)

All of the above

51.

  1. What is the primary role of ultra-violet light in mud logging?

a)

Measuring gas content in cuttings

b)

Detecting oil through fluorescence

c)

Determining mud weight

d)

Identifying formation pressure

e)

Enhancing core sample visibility

Similar Resources on Wayground

Technical quizz

50 questions

Technical quizz

quiz

Worksheet

•

University

CAPD: Unit Test 3

50 questions

CAPD: Unit Test 3

quiz

Worksheet

•

University

Packaging Machinery-Related Questions

51 questions

Packaging Machinery-Related Questions

quiz

Worksheet

•

University

EEE CAD LAB

50 questions

EEE CAD LAB

quiz

Worksheet

•

University

Hydraulics Mid Assessment

50 questions

Hydraulics Mid Assessment

quiz

Worksheet

•

University

EDP Webxam Review

46 questions

EDP Webxam Review

quiz

Worksheet

•

9th Grade - University

Quiz on c program

50 questions

Quiz on c program

quiz

Worksheet

•

University

Johnson Controls India Mock Test 02

50 questions

Johnson Controls India Mock Test 02

quiz

Worksheet

•

University