Abstract

Validation is important in any study of sedimentary high-frequency magnetic anomalies. Repeatability and good correlation of anomalies between lines of the same survey and lines from different surveys as well as maximum entropy spectral analysis are some of the approaches I used to verify and validate the geologic nature of these anomalies. Examples of such correlations from the National Petroleum Reserve in Alaska are used here for illustration. The filtered magnetic data used in these examples represent two surveys: the U.S. Department of Energy's low-level (120 m) National Uranium Resource Evaluation total field survey flown in 1980 and the high-level (650 m) high-sensitivity total field/vertical gradient survey flown in 1974 with measured vertical gradient. I will provide a general discussion on the magnetization of sediments as well as model studies illustrating the theoretical magnetic response of some typical sedimentary structures.

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