Spectral Density Logging Tool Measurement Principle Electrical Engineering

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Quizzes Created: 9 | Total Attempts: 4,040
| Attempts: 275
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  • 1/33 Questions

    The binding energy of inner shell electrons is greater than outer shell electrons and increases proportionally to the atomic number of the nucleus.

    • True
    • False
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About This Quiz

Explore the principles of Spectral Density Logging Tools (SDLT) in Electrical Engineering, focusing on applications such as shale volume determination and lithology analysis using scintillation detectors and gamma rays. Key skills assessed include understanding the measurement techniques and their limitations in different environments.

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  • 2. 

    Bulk density and photoelectric factor measurements are processed using windows W1 through W4.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The given statement is true. Bulk density and photoelectric factor measurements are processed using windows W1 through W4. This means that these measurements are analyzed and calculated using specific software or tools that are labeled as W1, W2, W3, and W4. These windows may have different functions or algorithms to process the data and provide accurate results for bulk density and photoelectric factor measurements. Therefore, the statement is correct.

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  • 3. 

    Once electron density (ρe) is derived from the count rates, it must be corrected for borehole diameter and mud weight.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement is true because when deriving electron density from count rates, it is necessary to correct for borehole diameter and mud weight. Borehole diameter affects the amount of mud in the hole, which in turn affects the measurement of electron density. Similarly, mud weight, which is the density of the drilling mud, can also influence the measurement. Therefore, to obtain accurate electron density values, corrections for these factors must be applied.

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  • 4. 

    The Spectral Density Logging Tool (SDLT) is designed to measure the electron density and gamma ray absorption properties of a formation.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The Spectral Density Logging Tool (SDLT) is specifically created to measure the electron density and gamma ray absorption properties of a formation. This tool enables the evaluation of the formation's composition and characteristics by analyzing the electron density and gamma ray absorption. Therefore, the statement "True" accurately reflects the purpose and function of the SDLT.

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  • 5. 

    Gamma rays emitted from the cesium-137 source have an initial energy of _____ KeV.

    • 662

    • 62

    • 6,662

    Correct Answer
    A. 662
    Explanation
    Gamma rays emitted from the cesium-137 source have an initial energy of 662 KeV.

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  • 6. 

    Energy levels of greater than ________ are used to obtain a formation's bulk density.

    • 100 keV

    • 1 MeV

    • 1000 keV

    • 10,000 keV

    Correct Answer
    A. 100 keV
    Explanation
    The energy levels of greater than 100 keV are used to obtain a formation's bulk density. This suggests that in order to accurately measure the bulk density of a formation, a minimum energy level of 100 keV is required. Energy levels below this threshold may not provide sufficient penetration or resolution to accurately measure the density of the formation.

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  • 7. 

    At lower energy levels (<100 KeV), gamma rays interact with ____ shell electrons of atoms.

    • Outer

    • Inner

    Correct Answer
    A. Inner
    Explanation
    At lower energy levels (

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  • 8. 

    What happens when a low energy (<100 keV) gamma ray interacts with the inner shell electron?

    • The electron absorbs the gamma ray and is ejected from its shell

    • The electron is displaced to an outer shell

    • The electron remains in an unchanged state

    Correct Answer
    A. The electron absorbs the gamma ray and is ejected from its shell
    Explanation
    When a low energy gamma ray interacts with the inner shell electron, it transfers its energy to the electron. This energy is sufficient to overcome the binding energy of the electron, causing it to be ejected from its shell. Therefore, the correct answer is that the electron absorbs the gamma ray and is ejected from its shell.

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  • 9. 

    How many detectors does the SDLT employ?

    • 2

    • 1

    • 3

    • 4

    Correct Answer
    A. 2
    Explanation
    The SDLT employs 2 detectors.

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  • 10. 

    The SDLT employs ___ scintillation detectors to measure the amount and energy level of scattered gamma rays.

    • 1

    • 2

    • 3

    • 4

    Correct Answer
    A. 2
    Explanation
    The correct answer is 2 because the question states that the SDLT employs scintillation detectors to measure scattered gamma rays. The word "scintillation" implies the use of scintillation detectors, which are devices that can detect and measure gamma rays. Therefore, it is logical to assume that the SDLT employs more than one scintillation detector, hence the answer is 2.

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  • 11. 

    Lithology can be determined from

    • Photoelectric factor

    • Tortuosity factor

    • Cementation exponent

    • Saturation exponent

    Correct Answer
    A. Photoelectric factor
    Explanation
    The lithology can be determined from the photoelectric factor. The photoelectric factor is a measure of the rock's ability to absorb or emit gamma rays when exposed to radiation. Different lithologies have different photoelectric factors due to variations in their mineral composition and density. By analyzing the photoelectric factor, geologists can identify the lithology of a rock formation.

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  • 12. 

    Gamma rays may be absorbed by an electron when their energy level reaches 

    • 100 keV

    • 1000 keV

    • 10,000 keV

    Correct Answer
    A. 100 keV
    Explanation
    Gamma rays may be absorbed by an electron when their energy level reaches 100 keV. This is because the energy of the gamma ray needs to match or exceed the binding energy of the electron in order for the absorption to occur. At energy levels below 100 keV, the gamma ray does not have enough energy to overcome the binding energy of the electron and therefore cannot be absorbed.

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  • 13. 

    At higher energy levels (>100 KeV), gamma rays interact with ____ shell electrons of atoms.

    • Outer

    • Inner

    Correct Answer
    A. Outer
    Explanation
    At higher energy levels (>100 KeV), gamma rays interact with outer shell electrons of atoms. This is because gamma rays are high-energy photons that can penetrate through the inner shells of atoms without interacting significantly. However, when they encounter the outer shell electrons, they can cause ionization or excitation of these electrons, leading to various atomic processes such as the emission of characteristic X-rays or the production of electron-positron pairs.

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  • 14. 

    Which of the following statements is true?

    • Energy loss in gamma rays can be related to physical characteristics of the formation

    • Gamma rays interacting with electrons in formation gain energy

    Correct Answer
    A. Energy loss in gamma rays can be related to physical characteristics of the formation
    Explanation
    Gamma rays can lose energy as they interact with the physical characteristics of the formation, such as the density and composition of the rocks. This energy loss can occur through various processes, including Compton scattering and photoelectric absorption. As the gamma rays interact with the electrons in the formation, they can transfer energy to the electrons, causing the gamma rays to lose energy. Therefore, the statement "Energy loss in gamma rays can be related to physical characteristics of the formation" is true.

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  • 15. 

    The SDLT employs a 1.5 Curie chemical source of ________ to emit a continuous stream of gamma rays

    • Cesium-137

    • Americium/Beryllium

    • Cobalt 60

    • Thorium

    Correct Answer
    A. Cesium-137
    Explanation
    The correct answer is Cesium-137. Cesium-137 is a radioactive isotope that emits gamma rays. It is commonly used in industrial and medical applications, including in the construction of the Self-Contained Directional Locator Tool (SDLT). The SDLT utilizes a 1.5 Curie chemical source of Cesium-137 to emit a continuous stream of gamma rays, which can be detected and used for various purposes such as locating underground pipes or determining the density of materials.

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  • 16. 

    Stand-off refers to

    • Any physical separation between a detector and formation

    • Distance between source and short-spaced detector

    • Physical distance between the short-spaced and long-spaced detector

    • Distance traveled by gamma rays from the source to the point at which it is absorbed

    Correct Answer
    A. Any physical separation between a detector and formation
    Explanation
    Stand-off refers to any physical separation between a detector and formation. This means that there is a distance or gap between the detector and the formation being measured. This physical separation can affect the accuracy and reliability of the measurements taken by the detector, as it introduces potential sources of error or interference. Therefore, stand-off is an important factor to consider when analyzing and interpreting data collected by detectors in various applications.

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  • 17. 

    The SDLT cannot acquire accurate data in

    • Cased Hole

    • Freshwater-based mud

    • Saltwater-based mud

    • Air-drilled holes

    Correct Answer
    A. Cased Hole
    Explanation
    The SDLT (Shallow Depth Logging Tool) is unable to acquire accurate data in cased holes. Cased holes are wells that have been lined with casing to provide stability and prevent collapse. The casing obstructs the direct contact between the tool and the formation, making it difficult for the SDLT to accurately measure the properties of the rock or fluid in the formation. Therefore, the SDLT is not suitable for acquiring accurate data in cased holes.

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  • 18. 

    When a low energy gamma ray collides with the inner shell electron and transfers its entire energy to that electron, which of the following occurs?

    • Photoelectric absorbsion

    • Compton scattering

    • Scintillation

    Correct Answer
    A. Photoelectric absorbsion
    Explanation
    When a low energy gamma ray collides with the inner shell electron and transfers its entire energy to that electron, photoelectric absorption occurs. In this process, the electron is ejected from its orbit, creating a vacancy. Another electron from a higher energy level fills this vacancy, releasing energy in the form of characteristic x-rays or Auger electrons. This phenomenon is commonly observed in materials with high atomic numbers.

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  • 19. 

    Measured gamma rays are sorted according to their energy levels into ____ different ranges or windows.

    • 4

    • 2

    • 6

    • 8

    Correct Answer
    A. 8
    Explanation
    Gamma rays are high-energy electromagnetic waves emitted during radioactive decay or nuclear reactions. They can have a wide range of energy levels. To effectively analyze and interpret gamma ray data, scientists sort them into different energy ranges or windows. The more energy ranges they use, the more detailed and precise their analysis can be. Therefore, having 8 different ranges or windows would provide a more comprehensive understanding of the gamma ray data compared to having fewer ranges.

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  • 20. 

    The energy loss experienced by a gamma ray in a collision with an outer shell electron is dependent on the rock's molecular composition.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The energy loss experienced by a gamma ray in a collision with an outer shell electron is dependent on the rock's molecular composition. This is because different elements and compounds have different atomic structures and electron configurations, which affect the probability of interaction between gamma rays and electrons. Therefore, the molecular composition of the rock determines the energy loss experienced by the gamma ray during collision.

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  • 21. 

    Which of the following best describes Compton scattering?

    • Higher energy (>100 keV) gamma rays collide with an outer shell electron and transfers some of its energy to that electron.

    • Higher energy (>100 keV) gamma rays collide with an inner shell electron causing the electron to move to an outer shell

    • Low energy (

    • Low energy (

    Correct Answer
    A. Higher energy (>100 keV) gamma rays collide with an outer shell electron and transfers some of its energy to that electron.
    Explanation
    Compton scattering occurs when higher energy gamma rays collide with an outer shell electron and transfer some of their energy to that electron. This process results in a change in the direction and wavelength of the gamma ray, while the electron is ejected from its original position with increased energy. This phenomenon is an important interaction between gamma rays and matter, providing evidence for the particle-like nature of photons and supporting the concept of wave-particle duality.

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  • 22. 

    What correction is applied to the bulk density measurement for a washout?

    • Positive

    • Negative

    • No change

    Correct Answer
    A. Positive
    Explanation
    When a washout occurs, it refers to the loss of material from the sample during the measurement process. This loss can result in a decrease in the bulk density measurement. To correct for this, a positive correction is applied to account for the lost material and adjust the bulk density measurement upward. This ensures that the measurement accurately reflects the density of the remaining material in the sample.

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  • 23. 

    Which of the following curves represents corrections applied to bulk density caused by stand-off?

    • CORM curve

    • CORP curve

    • RHOB curve

    Correct Answer
    A. CORP curve
    Explanation
    The CORP curve represents corrections applied to bulk density caused by stand-off.

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  • 24. 

    Interactions with inner shell electrons are ___________.

    • Lithology-independent

    • Lithology-dependent

    • Porosity-independent

    • Porosity-dependent

    Correct Answer
    A. Lithology-dependent
    Explanation
    Interactions with inner shell electrons depend on the lithology, or the type of rock or mineral present. Different lithologies have different arrangements of electrons in their inner shells, which affects how they interact with other particles or radiation. Therefore, the interactions with inner shell electrons are lithology-dependent.

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  • 25. 

    What correction is applied to the bulk density measurement for barite mudcake?

    • Positive

    • Negative

    • No Change

    Correct Answer
    A. Negative
    Explanation
    The correction applied to the bulk density measurement for barite mudcake is negative. This means that the measured bulk density of the mudcake is adjusted downwards to account for any excess weight or density caused by the presence of barite particles. This correction is necessary to obtain an accurate measurement of the actual density of the mudcake without the influence of the barite.

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  • 26. 

    The SDLT can acquire accurate data in

    • Cased Hole

    • Freshwater-based mud

    • Saltwater-based mud

    • Air-drilled holes

    Correct Answer(s)
    A. Freshwater-based mud
    A. Saltwater-based mud
    A. Air-drilled holes
    Explanation
    The SDLT (Sonic Data Logging Tool) is capable of acquiring accurate data in cased hole, freshwater-based mud, saltwater-based mud, and air-drilled holes. This implies that the tool is versatile and can be used in different drilling environments. It can effectively measure and analyze sonic data in these specific conditions, providing valuable information for well evaluation and reservoir characterization.

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  • 27. 

    Which windows are used to compensate for shifts in the energy spectra that are caused by temperature variations downhole?

    • W1-W4

    • W2-W5

    • W4-W8

    • W5-W8

    Correct Answer
    A. W5-W8
    Explanation
    Windows W5-W8 are used to compensate for shifts in the energy spectra that are caused by temperature variations downhole.

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  • 28. 

    Interactions with outer shell electrons are ___________.

    • Lithology-independent

    • Lithology-dependent

    • Porosity-independent

    • Porosity-dependent

    Correct Answer
    A. Lithology-independent
    Explanation
    Interactions with outer shell electrons are independent of the lithology. This means that the type of rock or mineral composition does not affect how the outer shell electrons interact with other substances or elements. The behavior of these electrons remains consistent regardless of the lithology, making their interactions lithology-independent.

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  • 29. 

    Which of the following curves represents corrections applied to bulk density for lithology?

    • CORM curve

    • CORP curve

    • RHOB curve

    Correct Answer
    A. CORM curve
    Explanation
    The CORM curve represents corrections applied to bulk density for lithology.

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  • 30. 

    Select all of the following that apply to scintillation detectors.

    • Crystal is composed of sodium chloride NaCl

    • Scintillation crystal coupled to a photo multiplier tube

    • Gamma rays interact with the scintillation crystal

    • Electrons pass through high voltage fields to produce several secondary electrons

    • Electrons are ejected from the photo multiplier tube

    Correct Answer(s)
    A. Scintillation crystal coupled to a photo multiplier tube
    A. Gamma rays interact with the scintillation crystal
    A. Electrons pass through high voltage fields to produce several secondary electrons
    Explanation
    Scintillation detectors are composed of a scintillation crystal coupled to a photo multiplier tube. These detectors work by detecting gamma rays that interact with the scintillation crystal. When gamma rays interact with the crystal, electrons are produced and pass through high voltage fields, creating several secondary electrons. These secondary electrons are then ejected from the photo multiplier tube.

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  • 31. 

    Which of the following are gamma ray absorbers?

    • Iron

    • Barite

    • Bentonite

    • Hydrogen

    Correct Answer(s)
    A. Iron
    A. Barite
    Explanation
    Iron and Barite are both gamma ray absorbers. Iron is a commonly used material for shielding against gamma rays due to its high density and atomic number. It effectively absorbs and attenuates the gamma radiation. Barite, a mineral composed of barium sulfate, is also known for its ability to absorb gamma rays. It is often used in the oil and gas industry as a weighting agent in drilling fluids to provide radiation shielding. Bentonite and Hydrogen, on the other hand, are not known for their gamma ray absorption properties.

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  • 32. 

    Select all of the following applications of the SDLT.

    • Determine the volume of shale

    • Measure formation permeability

    • Identification of gas bearing formations

    • Estimation of formation true resistivity

    • Estimation of hydrocarbon density

    • Determine formation porosity

    • Determine lithology

    Correct Answer(s)
    A. Determine the volume of shale
    A. Identification of gas bearing formations
    A. Estimation of hydrocarbon density
    A. Determine formation porosity
    A. Determine lithology
    Explanation
    The SDLT (Spectral Density Logging Tool) can be used to determine the volume of shale by analyzing the spectral gamma ray response. It can also help in the identification of gas bearing formations by detecting the presence of gas through gamma ray and neutron measurements. The tool can estimate hydrocarbon density by measuring the bulk density of the formation. It can determine formation porosity by analyzing the neutron and density measurements. Additionally, the SDLT can determine lithology by analyzing the spectral gamma ray response and comparing it to known lithology signatures.

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  • Mar 21, 2023
    Quiz Edited by
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  • Jul 30, 2014
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