Seismic attributes revisited

Taner, M. Turhan; Schuelke, James S.; O’Doherty, Ronen; Baysal, Edip

doi:10.1190/1.1822709

Cited by 134 publications

(82 citation statements)

References 2 publications

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“…Following removal of this long-term trend, the data were analyzed using spectral analysis with the multitaper method (MTM, Thomson, 1982) associated with the robust red noise modelling (Mann and Lees, 1996) as implemented in the SSA-MTM Toolkit (Ghil et al, 2002). To extract cycles, we used lowand bandpass filtering using the Taner filter (Taner, 2000). To convert from depth domain to time domain, we time-calibrated the MS record using the 405 kyr eccentricity term, as recommended for Mesozoic stratigraphy by Laskar et al (2004).…”

Section: Methodsmentioning

confidence: 99%

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Astronomical calibration of the Toarcian Stage: Implications for sequence stratigraphy and duration of the early Toarcian OAE

Boulila

Galbrun

Huret

et al. 2014

Earth and Planetary Science Letters

158

138

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The Toarcian Oceanic Anoxic Event (T-OAE) of the early Jurassic period involves one of the largest perturbations of the carbon cycle in the past 250 Ma, recorded by a pronounced negative carbon-isotope excursion (CIE). Numerous studies have focused on potential causes of the T-OAE and CIE, but are hampered by an uncertain timescale. Here we present high-resolution (!2 kyr) magnetic susceptibility (MS) measurements from the marine marls of the Sancerre-Couy drill-core, southern Paris Basin, spanning the entire Toarcian Stage. The MS variations document a rich series of sub-Milankovitch to Milankovitch frequencies (precession, obliquity and eccentricity) with the periodic g 2 -g 5 (405 kyr) and quasi-periodic g 4 -g 3 (!2.4 Myr Cenozoic mean periodicity) eccentricity terms being the most prominent. The MS-related g 4 -g 3 variation reflects third-order eustatic sequences, and constrains the sequence stratigraphic framework of the Toarcian Stage. In addition, MS variations reveal a modulation of g 2 -g 5 by g 4 -g 3 eccentricity related cycles, suggesting that sea-level change was the main control on the deposition of the Toarcian Sancerre marls, in tune with the astro-climatic frequencies. The stable 405 kyr cyclicity constrains a minimum duration of the Toarcian Stage to !8.3 Myr, and the well documented CIE, associated with the T-OAE, to !300 to 500 kyr. The 405 kyr MS timescale calibrates the periodicity of the prominent high-frequency ! 13 C cycles that occur in the decreasing part of the CIE to 30 to 34 kyr, consistent with the Toarcian obliquity period predicted for an Earth experiencing sustained tidal dissipation.

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Section: Methodsmentioning

confidence: 99%

“…(b) #3.2 Myr eccentricity cycles extracted with a 0.37 cycles/Myr cut-off frequency. All low-pass filtering was performed using the Taner filter (Taner, 2000).…”

Section: B Details On Nannofossil Biostratigraphymentioning

confidence: 99%

Astronomical calibration of the Toarcian Stage: Implications for sequence stratigraphy and duration of the early Toarcian OAE

Boulila

Galbrun

Huret

et al. 2014

Earth and Planetary Science Letters

158

138

View full text Add to dashboard Cite

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“…They can be computed from: (1) real and quadrature components of seismic data (Taner et al 1979) and (2) the temporal or geometric relationships within seismic data (Chopra and Marfurt 2007). Attributes derived from the complex trace, such as instantaneous phase and instantaneous frequency, are routinely applied to assist seismic interpretation (Taner 2001;Taner et al 1979).…”

Section: Seismic Processing and Seismic Attributesmentioning

confidence: 99%

Semiautomatic and Automatic Cooperative Inversion of Seismic and Magnetotelluric Data

Harris

Pethick

et al. 2016

Surv Geophys

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Natural source electromagnetic methods have the potential to recover rock property distributions from the surface to great depths. Unfortunately, results in complex 3D geo-electrical settings can be disappointing, especially where significant near-surface conductivity variations exist. In such settings, unconstrained inversion of magnetotelluric data is inexorably non-unique. We believe that: (1) correctly introduced information from seismic reflection can substantially improve MT inversion, (2) a cooperative inversion approach can be automated, and (3) massively parallel computing can make such a process viable. Nine inversion strategies including baseline unconstrained inversion and new automated/semiautomated cooperative inversion approaches are applied to industry-scale co-located 3D seismic and magnetotelluric data sets. These data sets were acquired in one of the Carlin gold deposit districts in north-central Nevada, USA. In our approach, seismic information feeds directly into the creation of sets of prior conductivity model and covariance coefficient distributions. We demonstrate how statistical analysis of the 123Surv Geophys (2016) 37:845-896 DOI 10.1007/s10712-016-9377-z distribution of selected seismic attributes can be used to automatically extract subvolumes that form the framework for prior model 3D conductivity distribution. Our cooperative inversion strategies result in detailed subsurface conductivity distributions that are consistent with seismic, electrical logs and geochemical analysis of cores. Such 3D conductivity distributions would be expected to provide clues to 3D velocity structures that could feed back into full seismic inversion for an iterative practical and truly cooperative inversion process. We anticipate that, with the aid of parallel computing, cooperative inversion of seismic and magnetotelluric data can be fully automated, and we hold confidence that significant and practical advances in this direction have been accomplished.

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“…Seismic attributes are all the information obtained from seismic data, either by direct measurements or by logical or experience-based reasoning 37 . The attributes used in this study can be briefly defined as;…”

Section: Chapter Three: Neural Network Analysismentioning

confidence: 99%