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Bialas, Jörg [Author]; Bohlen, T. [Author]; Dannowski, Anke [Author]; Eisenberg-Klein, G. [Author]; Gassner, L. [Author]; Gehrmann, R. [Author]; Heeschen, K. [Author]; Hölz, Sebastian [Author]; Jegen, Marion [Author]; Klaucke, Ingo [Author]; Krieger, M. [Author]; Mann, J. [Author]; Müller, Ch [Author]; Prüßmann, J. [Author]; Schicks, J. [Author]; Schünemann, E. [Author]; Schwalenberg, K. [Author]; Sommer, Malte [Author]; Smilde, P. L. [Author]; Spangenberg, E. [Author]; Trappe, H. [Author]; Zander, Timo [Author]

Joint interpretation of geophysical field experiments in the danube deep-sea fan, Black Sea

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  • Media type: E-Article
  • Title: Joint interpretation of geophysical field experiments in the danube deep-sea fan, Black Sea
  • Contributor: Bialas, Jörg [Author]; Bohlen, T. [Author]; Dannowski, Anke [Author]; Eisenberg-Klein, G. [Author]; Gassner, L. [Author]; Gehrmann, R. [Author]; Heeschen, K. [Author]; Hölz, Sebastian [Author]; Jegen, Marion [Author]; Klaucke, Ingo [Author]; Krieger, M. [Author]; Mann, J. [Author]; Müller, Ch [Author]; Prüßmann, J. [Author]; Schicks, J. [Author]; Schünemann, E. [Author]; Schwalenberg, K. [Author]; Sommer, Malte [Author]; Smilde, P. L. [Author]; Spangenberg, E. [Author]; Trappe, H. [Author]; Zander, Timo [Author]
  • Published: Elsevier, 2020-11
  • Language: English
  • DOI: https://doi.org/10.1016/j.marpetgeo.2020.104551
  • Origination:
  • Footnote: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
  • Description: Highlights • Joint seismic, CSEM and geochemical estimate of gas and hydrate saturation. • Converted shear wave analyses for gas hydrate distribution. • Wide angle full waveform inversion. • Paleo-BSRs and gas hydrate system in disequilibrium. • Numerical framework for joint inversion of multiple geophysical methods. Abstract Gas hydrates are naturally-occurring solid compounds of gas and water within almost all sediment-rich continental margins. Due to the large amounts of methane stored in submarine gas hydrates, they might serve as future reservoirs for offshore marine gas production. Assessing the reservoir characteristics requires reliable estimates of both the gas and gas hydrate concentration, which can be best addressed using geophysical and geological investigations. Here, we demonstrate the power of joint interpretation of interdisciplinary geophysical techniques and geological laboratory experiments. Regional 2D multichannel seismic data provide the broad overview of a hydrate-bearing area. High-resolution 2D and 3D seismic reflection data provide detailed images of two working areas, the buried S1 channel-levee system at 1500 m water depth (well within the gas hydrate stability zone) and a slope failure location, located at 665 m water depth (top limit of the hydrate formation) next to the S2 channel. Detailed compressional and shear wave (Vs) velocity-depth models were derived from four component ocean-bottom seismic data, the latter from P- to S-conversion upon reflection. Due to their steep reflection angles, shear wave events result in less resolved Vs models. Nevertheless, in case of a change in elasticity of the sediment matrix due to gas hydrate cementation, shear wave events can be used as an indicator. As such, Vs can give insight into the nature of hydrate formation throughout the GHSZ. We present new developments in the application of common reflection surface, normal-incidence-point tomography and full waveform inversion techniques to enhance model resolution for the seismic data sets. 2D ...
  • Access State: Open Access