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Definition of geohazards in exploration 3-D seismic data using attributes and neural-network analysis

¹ Statoil ASA, N-4035 Stavanger, Norway; rohe{at}statoil.com

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.

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.

This article has been cited by other articles:

				J. Cartwright The impact of 3D seismic data on the understanding of compaction, fluid flow and diagenesis in sedimentary basins Journal of the Geological Society, September 1, 2007; 164(5): 881 - 893. [Abstract] [Full Text] [PDF]