Petroleum System Analysis Quiz
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Questions and Answers

What is the primary purpose of a trap in a petroleum system?

  • To identify porous zones
  • To accumulate oil and gas (correct)
  • To measure reservoir resistivities
  • To facilitate the migration of oil and gas
  • In a clastic reservoir, what is the primary reconnaissance measurement used to identify reservoirs?

  • Resistivity log (correct)
  • Gravity data
  • Porosity log
  • Seismic data
  • What is the primary purpose of a seal in a petroleum system?

  • To allow the migration of oil and gas
  • To measure reservoir resistivities
  • To identify porous zones
  • To trap hydrocarbons and stop their migration (correct)
  • What types of rocks can be efficient seals in a petroleum system?

    <p>Anhydrite, salt, shale, and tight carbonate</p> Signup and view all the answers

    What is the primary reconnaissance measurement used to identify reservoirs in a carbonate system?

    <p>Porosity log</p> Signup and view all the answers

    What is the primary function of a seal in a petroleum system?

    <p>To prevent the movement of oil and gas over time</p> Signup and view all the answers

    What is commonly derived from other logs or measured from cores in a petroleum system?

    <p>Effective porosity and permeability logs</p> Signup and view all the answers

    What is the term for the avenue through which oil and gas move from the source into the reservoir rock to the trap?

    <p>Migration route</p> Signup and view all the answers

    What is the primary characteristic of a reservoir rock?

    <p>High porosity and high permeability</p> Signup and view all the answers

    What is the term for a rock that contains sufficient hydrocarbon-prone organic matter to generate oil and gas?

    <p>Source rock</p> Signup and view all the answers

    What is the study of how petroleum system elements and processes interact to create hydrocarbon-bearing provinces known as?

    <p>Petroleum System Analysis</p> Signup and view all the answers

    What is the term for economically viable concentrations of hydrocarbons?

    <p>Oil and Gas Fields</p> Signup and view all the answers

    What is the primary reason for the dark color of source rocks?

    <p>The presence of organic matter</p> Signup and view all the answers

    What is required for the preservation of organic matter in source rocks?

    <p>A subaqueous environment with stagnant sea-bed conditions</p> Signup and view all the answers

    What percentage of oil and gas is formed by the thermal alteration of kerogen?

    <p>80-90%</p> Signup and view all the answers

    What is the most important factor in the generation of hydrocarbons from kerogen?

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

    What is the threshold temperature for the onset of kerogen maturity?

    <p>75-80°C</p> Signup and view all the answers

    What is generated first during the thermal alteration of kerogen?

    <p>Heavy oil</p> Signup and view all the answers

    What is the primary difference between conventional and unconventional hydrocarbons?

    <p>The type of rock formation they are found in</p> Signup and view all the answers

    What is the term for the total volume of oil or gas present in a field before production?

    <p>Hydrocarbons in place</p> Signup and view all the answers

    What is the most important category of reserves from an economic perspective?

    <p>Proved reserves</p> Signup and view all the answers

    What are the two broad categories of reserve estimation methods?

    <p>Volumetric and performance analysis</p> Signup and view all the answers

    What is required for the performance analysis method of reserve estimation?

    <p>Long-term production data</p> Signup and view all the answers

    What are the two techniques used in the volumetric method of reserve estimation?

    <p>Deterministic and probabilistic</p> Signup and view all the answers

    What is the purpose of repeated random selections of values and their probabilities in petroleum system analysis?

    <p>To generate a large number of volumetric estimates</p> Signup and view all the answers

    What do the distributions obtained from the repeated random selections get converted into?

    <p>Probability distribution and cumulative probability curves</p> Signup and view all the answers

    What is the purpose of risk assessment in petroleum system analysis?

    <p>To distinguish between prospects based on risk</p> Signup and view all the answers

    What are the three types of reserves values that can be estimated from the probability distribution and cumulative probability curves?

    <p>Minimum, maximum, and most likely</p> Signup and view all the answers

    What is the main source of uncertainty in petroleum system analysis?

    <p>Quantities derived during exploration stages</p> Signup and view all the answers

    What is the purpose of evaluating multiple leads in petroleum system analysis?

    <p>To compare the results from different iterations</p> Signup and view all the answers

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