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The Leading Edge; January 2001; v. 20; no. 1; p. 64-69; DOI: 10.1190/1.1438880
© 2001 Society of Exploration Geophysicists
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Fault imaging using edge detection and coherency measures on Hibernia 3-D seismic data

Nicholle Carter

Husky Energy, Calgary, Alberta, Canada

Larry Lines

University of Calgary, Alberta, Canada

Corresponding author: L. Lines, lines@geo.ucalgary.ca

The first 20% of the full text of this article appears below.

The coherence cube and related technologies are valuable interpretation aids for fault detection. A testimony to the importance of technique was the citation of "3-D seismic attributes using a semblance-based coherency algorithm" by Marfurt et al. as Best Paper in GEOPHYSICS in 1998.

Detection of faults in offshore seismic exploration has been enhanced by algorithms from two families—those that measure coherency and those that detect discontinuities or "edges" by differencing. (Actually it is more accurate to say that these algorithms detect faults by revealing a lack of coherency.) This study applies such "uncoherency" methods to depth migrations from Hibernia Field and compares results for both synthetic and real data. The mathematical algorithms are detailed in Carter's 1999 master's thesis from Memorial University of Newfoundland.

Hibernia Field, potentially one of North America's most important offshore sources of crude oil, is about 315 km southeast of St. John's, Newfoundland, and is part of the Jeanne d'Arc Basin which includes a large number of extensional faults (Figure 1a). A detailed geologic picture of this basin is being developed with the use of 3-D seismic surveys. A Hibernia 3-D seismic survey was made available to the Memorial University Seismic Imaging Consortium (MUSIC) by the Hibernia Management and Development Corporation (HMDC) for research into imaging algorithms.


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  		Figure 1. (a) Location and (b) complex structure of Hibernia Field.

 
Seismic data traditionally have been processed to image continuous reflections rather than to image discontinuities such as faults. However, due to the complex structure of offshore Newfoundland (Figure 1b), fault imaging is extremely important. The Hibernia structure is characterized by extensional faulting and a rollover anticline formed due to salt diapirism. The Murre Fault, a major listric growth fault, bounds the western side of the field (Figure 1b). It is offset by the . . . [Full Text of this Article]




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