Petroleum Geology: Formation Evaluation and Well Logging

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Questions and Answers

What is the primary source of gamma radiation in formation measured by gamma ray logging?

Potassium-40 and isotopes of the Uranium-Plutonium and Thorium series
Potassium-40 and isotopes of the Uranium-Radium and Thorium series (correct)
Potassium-40 and isotopes of the Uranium-Radium and Plutonium series
Potassium-39 and isotopes of the Uranium-Radium and Thorium series

What is the commonly used symbol for Gamma Ray log?

GRY
GL
GR (correct)
GA

What happens to the energy of gamma rays as they travel through the formation?

They lose all energy as soon as they are emitted
They progressively reduce in energy due to collisions with other atoms in the rock (Compton scattering) (correct)
Their energy remains constant throughout their travel
They increase in energy due to collisions with other atoms in the rock

What is the main purpose of lithology log tools?

<p>To understand the physical principles behind lithology log operations (B)</p> Signup and view all the answers

What are some of the isotopes contributing to gamma radiation in formations?

<p>$^{40}K$, Uranium-Radium, Thorium series (B)</p> Signup and view all the answers

Study Notes

Gamma Ray Logging

Primary source of gamma radiation in formation measured by gamma ray logging: Potassium-40 (40K), Uranium-238 (238U), and Thorium-232 (232Th) isotopes

Gamma Ray Log Symbol

Symbol commonly used for Gamma Ray log: GR

Energy of Gamma Rays

Energy of gamma rays decreases as they travel through the formation due to absorption and scattering by the surrounding rock

Lithology Log Tools

Main purpose of lithology log tools: to identify and characterize rock types and their properties

Isotopes Contributing to Gamma Radiation

Isotopes contributing to gamma radiation in formations: 40K, 238U, and 232Th

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Description

Test your knowledge of lithology log tools, environmental corrections, and interpretation of Gamma Ray Logs in petroleum geology. Learn about the physical principles behind the operation of lithology log tools and the environmental corrections needed to be applied to lithology logs.