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Geometric seismic attribute estimation using data-adaptive windows

Lin Tengfei, Bo Zhang and Kurt J. Marfurt
Geometric seismic attribute estimation using data-adaptive windows
Interpretation (Tulsa) (May 2019) 7 (2): SC33-SC43

Abstract

Geometric seismic attributes such as coherence are routinely used for highlighting geologic features such as faults and channels. Traditionally, we use a single user-defined analysis window of fixed size to calculate attributes for the entire seismic volume. In general, smaller windows produce sharper geologic edges, but they are more sensitive to noise. In contrast, larger windows reduce the effect of random noise, but they might laterally smear faults and channel edges and vertically mix the stratigraphy. The vertical and lateral resolutions of a 3D seismic survey change with depth due to attenuation losses and velocity increase, such that a window size that provides optimal images in the shallower section is often too small for the deeper section. A common workaround to address this problem is to compute the seismic attributes using a suite of fixed windows and then splice the results at the risk of reducing the vertical continuity of the final volume. Our proposed solution is to define laterally and vertical smoothly varying analysis windows. The construction of such tapered windows requires a simple modification of the covariance matrix for eigenstructure-based coherence and a less obvious, but also simple, modification of semblance-based coherence. We determine the values of our algorithm by applying it to a vintage 3D seismic survey acquired offshore Louisiana, USA.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 7
Serial Issue: 2
Title: Geometric seismic attribute estimation using data-adaptive windows
Affiliation: PetroChina, Research Institute of Petroleum Exploration and Development, Beijing, China
Pages: SC33-SC43
Published: 201905
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 16
Accession Number: 2019-036097
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Special section: Seismic geometric attributes
Illustration Description: illus. incl. sects., sketch maps
N18°00'00" - N30°04'00", W98°00'00" - W80°30'00"
Secondary Affiliation: University of Alabama, USA, United StatesUniversity of Oklahoma, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201909
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