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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes


Chapter from: M 66:  Hydrocarbon Migration And Its Near-Surface Expression
Edited By 
Dietmar Schumacher and Michael A. Abrams

Robert S. Foote

Geochemistry, Generation, Migration

Published 1996 as part of Memoir 66
Copyright © 1996 The American Association of Petroleum Geologists.  All Rights Reserved.

Foote, R. S., 1996, Relationship of near-surface Previous HitmagneticNext Hit anomalies to oil- and gas-producing area, in D. Schumacher and M. A. Abrams, eds., Hydrocarbon migration and its near-surface expression: AAPG Memoir 66, p. 111-126.
Chapter 9
Relationship of Near-Surface Previous HitMagneticNext Hit Anomalies to Oil- and Gas-Producing Areas
Robert S. Foote

Geoscience & Technology, Inc.
Irving, Texas, U.S.A.



Observation of aeromagnetic patterns associated with the Cement oil field initiated a continuing program to investigate the association of shallow Previous HitmagneticNext Hit anomalies with the presence of oil and gas reservoirs. If local Previous HitmagneticNext Hit anomalies are detectable from an aircraft, the source of such anomalies will necessarily be present in the near-surface sedimentary strata as Previous HitmagneticNext Hit minerals sufficiently concentrated to allow airborne detection and identification by Previous HitmagneticNext Hit susceptibility measurement of drill cuttings. The results of analysis of cesium vapor magnetometer data are supported by exploration drill hole rock Previous HitmagneticNext Hit susceptibility data from four separated areas: (1) Caddo and Grady counties, Oklahoma; (2) Cheyenne County, Colorado; (3) San Juan County, Utah; and (4) southwestern Alabama. Results indicate a strong correlation of oil- and gas-producing areas with Previous HitmagneticNext Hit anomalies produced from the aeromagnetic data and with intervals of enriched Previous HitmagneticNext Hit rock strata in the shallow sedimentary environment. For the areas studied, 78-90% of oil and gas exploration drilling within the Previous HitmagneticNext Hit bright spot (MBS) anomalies is productive. Outside these anomalies, only 5-16% is productive. Analyses of minerals by X-ray diffraction and Mossbauer effect measurements have identified maghemite and greigite as the major iron-bearing minerals in the anomalous Previous HitmagneticTop sedimentary intervals.

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