Abstract
A low-altitude (300-ft), close-spaced (4 lines/mi) airborne magnetic gradiometer survey was flown in a 1000-mi/sup 2/ area in northeastern Montana. The area contains 31 oil fields and a modern high-frequency, broad-bandwidth seismic data set. The aeromagnetic survey was designed specifically to study and analyze the short-wavelength, small-amplitude magnetic anomalies associated with near-surface magnetic sources. Some near-surface magnetic sources may be related to epigenetic changes associated with seeps from hydrocarbon reservoirs. All 31 oil fields had a near-surface magnetic anomaly. Other near-surface magnetic anomalies had an obvious seismic anomaly visible on the high-frequency, broad-bandwidth seismic data available in the area. In addition, the zones offsetting the observed near-surface magnetic anomalies can be seen in the seismic data, suggesting a small, but deep-seated Quaternary or Holocene wrench-fault system. Many of the magnetic offset zones were also visible in available Landsat data. These offset zones may provide the vertical migration paths for reservoir seeps.
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