Petrophysics MSc Course Notes by Dr. Paul W.J. Glover
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Questions and Answers

What is the first step in the search for economic accumulations of oil and gas?

  • Measurement with wireline tools
  • Recognition of likely geological provinces (correct)
  • Seismic surveying
  • Drilling wild-cat wells
  • Which logging tool is primarily used to evaluate the borehole environment?

  • Neutron logging
  • Caliper logging (correct)
  • Radioactivity logging
  • Temperature logging
  • What property does the neutron log primarily measure?

  • Capillary pressure
  • Resistivity
  • Permeability
  • Porosity (correct)
  • Which log is used to measure the formation density?

    <p>Formation density log</p> Signup and view all the answers

    What is the primary purpose of resistivity theory in petrophysics?

    <p>To study the electrical properties of rocks</p> Signup and view all the answers

    What is the primary responsibility of the exploration geologist?

    <p>Correlating wireline responses to create a large scale image</p> Signup and view all the answers

    What is the initial aim of the petrophysicist when analyzing sub-surface formations?

    <p>Differentiating between oil, gas, and water bearing formations</p> Signup and view all the answers

    Who plays a significant role in carrying out initial reservoir modeling?

    <p>Petrophysicist</p> Signup and view all the answers

    What is the main influence of the geologist in evaluating sub-surface formations?

    <p>Interested in lithology, stratigraphy, and depositional environment</p> Signup and view all the answers

    What is the primary database of information available to both the geologist and petrophysicist?

    <p>Wireline log data</p> Signup and view all the answers

    What is the main purpose of capillary pressure in petrophysics?

    <p>To determine the size and distribution of pores in the rock</p> Signup and view all the answers

    What is the primary function of the total gamma ray log in petrophysics?

    <p>To measure the natural radioactivity of the formation</p> Signup and view all the answers

    What is the main influence of clay on resistivity and porosity in petrophysics?

    <p>Increases resistivity and decreases porosity</p> Signup and view all the answers

    In petrophysics, what does the sonic log primarily measure?

    <p>Acoustic velocity</p> Signup and view all the answers

    What is the main purpose of fluid testing and pressure logs in petrophysics?

    <p>To evaluate the fluid composition and behavior in the reservoir</p> Signup and view all the answers

    What is the main responsibility of the petrophysicist in analyzing sub-surface formations?

    <p>To design reservoir management strategies</p> Signup and view all the answers

    In the evaluation of sub-surface formations, what is the primary influence of the geologist?

    <p>Creating a large scale image of the sub-surface geology</p> Signup and view all the answers

    What is the main purpose of resistivity theory in petrophysics?

    <p>To estimate the porosity of the formations</p> Signup and view all the answers

    What is the primary role of the exploration geologist?

    <p>Correlating wireline responses characteristic of a given formation</p> Signup and view all the answers

    What is the main database of information available to both the geologist and the petrophysicist?

    <p>Wireline log data and data from experiments on extracted cores</p> Signup and view all the answers

    Study Notes

    Searching for Economic Accumulations of Oil and Gas

    • The first step in the search for economic accumulations of oil and gas is not specified, but it likely involves exploration and data collection.

    Logging Tools

    • The caliper log is used to evaluate the borehole environment.
    • The neutron log primarily measures the porosity of a formation.
    • The density log is used to measure the formation density.
    • The sonic log primarily measures the formation's acoustic velocity.

    Petrophysics

    • The primary purpose of resistivity theory in petrophysics is to understand the flow of electric current through a formation and its relationship with the formation's fluid saturation and rock properties.
    • The primary function of the total gamma ray log is to measure the natural radioactivity of a formation.
    • The main purpose of capillary pressure in petrophysics is to understand the relationship between the pore throat size and the corresponding capillary pressure.
    • The main purpose of fluid testing and pressure logs is to obtain information about the formation fluids and their pressures.

    Roles and Responsibilities

    • The primary responsibility of the exploration geologist is to find potential areas with economic accumulations of oil and gas.
    • The main responsibility of the petrophysicist is to analyze sub-surface formations and provide information about the formation's properties and fluid saturation.
    • The petrophysicist and geologist both play a significant role in carrying out initial reservoir modeling.
    • The geologist's main influence in evaluating sub-surface formations is in providing information about the formation's geological structure and properties.

    Data and Information

    • The main database of information available to both the geologist and petrophysicist is the well log data.
    • Clay has a significant influence on resistivity and porosity in petrophysics, as it can affect the formation's electrical properties and fluid flow.

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    Explore the comprehensive Petrophysics MSc course notes covering topics such as porosity, permeability, wireline logging, and more. Gain valuable insights into the principles and techniques essential for understanding subsurface reservoirs.

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