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AAPG Bulletin
Abstract
AAPG Bulletin, V.
2004. The American Association of Petroleum Geologists. All rights reserved.
Definition of geohazards in exploration 3-D seismic data using attributes and neural-network analysis
Roar Heggland1
1Statoil ASA, N-4035 Stavanger, Norway; [email protected]
AUTHORS
Roar Heggland is a geophysicist with Statoil ASA in Stavanger, Norway. He joined Statoil in 1984 and has worked as a seismic interpreter in exploration, research, and technology applications with specific focus on geohazards and fluid flow. He is coinventor of the method for detection of 
gas
chimneys in 3-D seismic data. Roar Heggland holds a degree in particle physics from the University of Bergen, Norway.
ACKNOWLEDGMENTS
Statoil ASA is acknowledged for giving permission to publish this article.
ABSTRACT
During a geohazards evaluation of an area in deep-water Green Canyon, using standard exploration three-dimensional (3-D) seismic data, different features of significance to drilling operations and the planning of seabed installations were observed. These features were indications of seabed slope instability, shallow gas accumulations in a channel deposit, gas chimneys, faults, and a seabed mound above a gas chimney. Edge-detection maps were used to highlight slope-failure scars, faults, the channel, and the seabed mound. Average absolute-amplitude maps were used to highlight slope-failure scars, faults, and possible shallow gas accumulations. Possible gas chimneys were mapped to identify fluid-migration pathways. The mapping of chimneys was done by the use of a recently developed method for detection of gas chimneys in 3-D seismic data. The method was developed to facilitate and increase the consistency in the mapping, as well as make gas chimneys visible in the map view. The results of the geohazards assessment were identification of a seabed slope-failure risk and a risk of overpressured gas
in channel deposits.
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