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Results from a High-resolution, 3-D Marine Gravity Gradiometry Survey over a Buried Salt Structure, Mississippi Canyon Area, Gulf of Mexico

By
Lincoln F. Pratson
Lincoln F. Pratson
Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, USA
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Robin E. Bell
Robin E. Bell
Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, USA
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Roger N. Anderson
Roger N. Anderson
Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, USA
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Dan Dosch
Dan Dosch
Bell Aerospace Co., Buffalo, New York, USA
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John White
John White
Bell Aerospace Co., Buffalo, New York, USA
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Clive Affleck
Clive Affleck
Bell Aerospace Co., Buffalo, New York, USA
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Andrew Grierson
Andrew Grierson
Bell Aerospace Co., Buffalo, New York, USA
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Bryant E. Korn
Bryant E. Korn
Texaco Exploration & Production Inc., New Orleans, Louisiana, USA
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Ronald L. Phair
Ronald L. Phair
Texaco Exploration & Production Inc., New Orleans, Louisiana, USA
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E. K. Biegert
E. K. Biegert
Shell Exploration and Technology Company, Houston, Texas, USA
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Peter E. Gale
Peter E. Gale
Shell Offshore Inc., New Orleans, Louisiana, USA
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Published:
January 01, 1998

Abstract

The first test of the Bell Aerospace gravity Gradiometry Survey System (GSS) for geologic applications was conducted in April 1994 in collaboration with the U.S. Navy. The GSS is a recently declassified gravity sensing system that contains the world's only moving-base gravity gradiometer. The system measures both gravitational acceleration and gravity gradients, yielding six measurements that define the local gravity field and its gradients in three dimensions a technologic advance in measuring gravity analogous to the advance from 2-D to 3-D seismic profiling through the towing of multiple rather than single hydrophone arrays. The gravity gradiometry test survey was conducted over a buried salt structure southsoutheast of New Orleans in water depths of ˜1500 m. The quality of the survey data is excellent. In declassified grids of the data at 2-km wavelengths, gravity gradients are resolved to 0.5 and gravity to 0.07 mGal. Simple models are used to illustrate the power of this data in subsurface structure definition. The potential utility of gravity gradiometry in oil and gas exploration then is demonstrated through application of the survey data in improving a geologic model of a part of the survey area derived from 3-D seismic data.

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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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