Origin of Gas Hydrates Imaged from the Acoustic Basement in the Northernmost South China Sea by Using OBS

Deng, Jia-Ming; Wang, T. K.; Lee, C. S.; Liu, C. S.

doi:10.3997/2214-4609.201401329

Cited by 1 publication

(2 citation statements)

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“…The smoothly and laterally varying velocity model was obtained from conventional semblance velocity analysis for estimating the stacking/interval velocity. (Deng et al 2010). Closely spaced but more randomly distributed OBS locations are designed for a target oriented exploration survey for gas hydrate through 3D survey (Cheng et al 2010).…”

Section: Application Of Marine Surveys and Data Typesmentioning

confidence: 99%

“…Hoffmann (2001) used the illumination information for resolution analysis. Gelius et al (2002) and Lecomte et al (2003) defined a resolution function and discussed the effect from complex velocity model. Schuster and Hu (2000) derived an analytical solution for target point-scatter responses by assuming a homogeneous velocity model with continuous distributed sources and receivers.…”

Section: Introductionmentioning

confidence: 99%

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Illumination and Resolution Analyses on Marine Seismic Data Acquisitions by the Adjoint Wavefield Method

Chen²

2012

Terr. Atmos. Ocean. Sci.

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We applied a wave-equation based adjoint wavefield method for seismic illumination and resolution analyses. A twoway wave-equation is used to calculate directional and diffracted energy fluxes for waves propagating between sources and receivers to the subsurface target. The first-order staggered-grid pressure-velocity formulation, which lacks the characteristic of being self-adjoint is further validated and corrected to render the modeling operator before its practical application. Despite most published papers on synthetic kernel research, realistic applications to two field experiments are demonstrated and emphasize its practical needs. The Fréchet sensitivity kernels are used to quantify the target illumination conditions. For realistic illumination measurements and resolution analyses, two completely different survey geometries and nontrivial pre-conditioning strategies based on seismic data type are demonstrated and compared. From illumination studies, particle velocity responses are more sensitive to lateral velocity variations than pressure records. For waveform inversion, the more accurately estimated velocity model obtained the deeper the depth of investigation would be reached. To achieve better resolution and illumination, closely spaced OBS receiver interval is preferred. Full waveform approach potentially provides better depth resolution than ray approach. The quantitative analyses, a by-product of full waveform inversion, are useful for quantifying seismic processing and depth migration strategies.

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Section: Application Of Marine Surveys and Data Typesmentioning

confidence: 99%