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Magnetostratigraphy

Estimated Time to Complete:

1 hour 20 minutes

(average of 20 minutes per Subtopic)

This course introduces the discipline of magnetostratigraphy, the branch of paleomagnetism that specifically studies the Earth’s ancient magnetic field. The course discusses the theory, magnetic mineralogy, the equipment and techniques used in the field and in the laboratory, practical applications, and a variety of other aspects of that could serve as valuable tools in hydrocarbon exploration. The most common application involves reversals in polarity that have occurred in Earth’s magnetic field throughout geologic time and how these can be used to establish the Geomagnetic Polarity Time Scale (GPTS) as a valid geochronometer. The course’s overall intent is to develop your capability to competently and confidently employ magnetostratigraphy in exploration and production. Upon completion of this course, you will better understand magnetostratigraphy’s uses and how it integrates with other disciplines in petroleum exploration.

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Total Number of Subtopics: 4
  • expand/collapse Fundamentals of Magnetostratigraphy
    • Introduction
    • Historical Background
    • Theoretical
    • Magnetic Mineralogy
    • Magnetic Minerals
    • Other Ferromagnetic Minerals
  • expand/collapse Magnetic Domains
    • Magnetization of Fine-grained Particles in Rocks
    • The Origin of Remanent Magnetization in Rocks
    • Remanent Magnetization
  • expand/collapse Field Methods
    • Introduction to Field Methods
    • Analytical Equipment
    • Depositional Environments
    • General Age of the Strata
    • Sampling Procedures
    • Sampling Theory
    • Sampling in the Field
    • Hand sampling
    • Sampling with a Pomeroy Drill
    • Sampling for Age Calibration
  • expand/collapse Types of Analytical Equipment
    • Field Free Space
    • Cryogenic Magnetometer
    • Spinner magnetometer
    • Laboratory Techniques
    • Alternating Field Demagnetization Equipment
    • Thermal Demagnetization
    • Thermal Demagnetization Furnaces
    • Chemical Demagnetization
    • Determining the Demagnetization Techniques to be Used on a Suite of Samples
    • Graphical Techniques for Displaying Results
    • Identification of the Primary and Secondary Components of Remanence
    • Precision of the Data
    • Field Tests for Accuracy of the Paleomagnetic Data
    • Developing a Local Paleomagnetic Polarity Reversal Scale
    • Tectonic Interpretation of Basin Subsidence History
    • Downhole techniques
    • Applications in the Petroleum Industry
    • References Cited
(Use the '+' and '-' buttons to expand or collapse each Subtopic Title individually for details.)