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Diffraction imaging of polygonal faults within a submarine volcanic terrain, Maverick Basin, south Texas

Osareni C. Ogiesoba, Alexander Klokov and Rodolfo Hernandez
Diffraction imaging of polygonal faults within a submarine volcanic terrain, Maverick Basin, south Texas (in Diffraction imaging, Marianne Rauch-Davies (prefacer), John O'Brien (prefacer), William A. Burnett (prefacer) and Sergey Fomel (prefacer))
Interpretation (Tulsa) (February 2015) 3 (1): SF81-SF99

Abstract

Polygonal fault systems are common structural features of intracratonic continental margins. The map-view geometry of these faults became apparent with the use of powerful fault-imaging seismic attributes, such as coherence and curvature. However, these attributes lack the amplitude information necessary for lithological evaluation. We developed a 3D diffraction volume that not only imaged faults but also contained amplitude information. From the unmigrated stack volume, we extracted diffractions that were transformed into amplitude envelope and root-mean-square amplitude volumes. These attributes, together with clay volume (V (sub clay) ) data, were extracted along interpreted horizons and fault planes. Crossplots between seismic attributes and V (sub clay) enabled linear relationships between the attributes and V (sub clay) , which were used to infer lithological composition within fault zones. Our results found that, although the fault zones were clay filled, some subvertically inclined clay-poor zones that could serve as permeable pathways were present along the fault planes. In map view, images from diffraction volume were comparable with those obtained from coherence and curvature attributes; however, diffraction images appeared to be busy because of the huge number of diffracted waves embedded in the data. In addition, we found that, although V (sub clay) increases with increasing diffraction energy, no systematic relationship exists between V (sub clay) and curvature, or between V (sub clay) and coherence. As such, curvature and coherence cannot be used to predict lithological distribution within fault zones. Furthermore, we observed that the higher the diffraction energies, the higher the fluid saturation, suggesting higher impedance contrast at the diffraction points. Therefore, we determined that by analyzing diffraction data, it was possible to infer likely sediment variations that largely control permeability within fault zones.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 3
Serial Issue: 1
Title: Diffraction imaging of polygonal faults within a submarine volcanic terrain, Maverick Basin, south Texas
Title: Diffraction imaging
Author(s): Ogiesoba, Osareni C.Klokov, AlexanderHernandez, Rodolfo
Author(s): Rauch-Davies, Marianneprefacer
Author(s): O'Brien, Johnprefacer
Author(s): Burnett, William A.prefacer
Author(s): Fomel, Sergeyprefacer
Affiliation: Bureau of Economic Geology, Austin, TX, United States
Affiliation: Devon Energy, Oklahoma City, OK, United States
Pages: SF81-SF99
Published: 201502
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 33
Accession Number: 2016-006942
Categories: Structural geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., chart, sketch maps
N25°45'00" - N36°30'00", W106°30'00" - W93°30'00"
Secondary Affiliation: Anadarko, USA, United StatesExxonMobil Upstream Research Company, USA, United StatesUniversity of Texas at Austin, USA, United States
Source Note: Online First
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201604
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