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Book Chapter

Gravity/Magnetic Signatures of Various Geologic Models—An Exercise in Pattern Recognition

By
Corine Prieto
Corine Prieto
Integrated Geophysics Corporation, Houston, Texas, USA
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Published:
January 01, 1998

Abstract

In every geologic province, the physical parameters are unique. The prospective anomaly signature associated with each individual area will vary accordingly. The pattern recognition of an anomaly signature is of vital importance to all interpretation sciences. The following discussion is intended for geophysicists and geologists interested in obtaining a working knowledge of what type of signal pattern should be observed to integrate gravity and magnetic data with seismic and geologic data for development of exploration targets. The incorporation of the integration process in exploration has been known to reduce risk and therefore reduce the total cost of exploration.

The gravity and magnetic anomaly signature characteristics are results of one or more physical parameters such as the configuration of the anomalous zone, density, velocity, and porosity contrasts, magnetic susceptibility contrasts, and the depth to the anomalous body. An excellent tool to aid in pattern recognition is structural modeling. A simple collection of geologic structures has been modeled and their calculated gravity and magnetic responses are discussed to identify anomaly characteristics. The collection is not intended to be a library of curves, but rather an exercise in pattern recognition. The 2-D modeling scheme used an interactive graphic system. The well-known Talwani algorithms (see references) were used as the basis for the computations.

The density and magnetic susceptibility contrasts are based on data from various geographic areas from the Superior Oil Company exploration cases and from published literature. The structures of the models have been kept simple to emphasize how depth, density, and susceptibility

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Contents

Society of Exploration Geophysicists Geophysical References Series

Geologic Applications of Gravity and Magnetics: Case Histories

Richard I. Gibson
Richard I. Gibson
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Patrick S. Millegan
Patrick S. Millegan
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Society of Exploration Geophysicists
Volume
8
ISBN electronic:
9781560801832
Publication date:
January 01, 1998

GeoRef

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