CRS-based Seismic Imaging in Complex Marine Geology

Leite, Lourenildo W. B.; Lima, H. M.; Heilmann, Björn Z.; Mann, J.

doi:10.3997/2214-4609.201401251

72nd EAGE Conference and Exhibition Incorporating SPE EUROPEC 2010 2010

DOI: 10.3997/2214-4609.201401251

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CRS-based Seismic Imaging in Complex Marine Geology

Lourenildo W. B. Leite¹,

H. M. Lima²,

Björn Z. Heilmann³

et al.

Abstract: This paper presents results of a consistent workflow for processing and imaging applied to marine seismic data. The data set was collected in the Southern Atlantic offshore Brazil. Searching for techniques to increase the data resolution, fundamental steps of signal processing together with imaging methods based on the data-driven CRS technology, such as CRS-stack based residual static correction and pre-stack data enhancement, were applied and proved to be successful. The final aim of the data processing and … Show more

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2016

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Seismic imaging of complex structures with the CO-CDS stack method

et al. 2016

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Various seismic imaging methods are introduced to resolve some of the possible ambiguities of seismic interpretation in complex structures. Reducing dependency of imaging techniques on velocity or using diffraction energy for imaging more structural details are the main topics of the imaging research. In this study, we try to improve the seismic image quality in semi-complex structures by combining the common reflection surface (CRS) method with a diffraction based scheme in the common-offset domain. Previously introduced partial CRS and common offset CRS methods exhibited reliable performance in imaging complex media. Here, we were looking for stable and efficient solutions, preserving advantages of the previous methods. Herewith, the proposed operator fits better to diffractions than to reflections. Therefore, we call it the commonoffset common diffraction surface stack (CO CDS). In a previous study, improvement of the quality of seismic image by the CRS method was achieved by combination of the CDS method with the partial CRS. This resulted in the introduction of the partial CDS. Initially, in this study, the common-offset CRS traveltime equation was modified to the common-offset CDS. The hypothetical shot reflector experiment in the CRS method was changed to shot diffraction point experiment. In the introduced operator, two wavefront curvatures, observed at receivers positions, are set equal in order to satisfy the diffraction condition. In the proposed method, we search for accurate attribute sets for each considered offset individually, and then form a new operator by four coherent attributes. Application of the common-offset CDS method on synthetic and field data shows more details of the geological structures with higher quality, while preserving continuity of reflection events. The proposed method is, however, more expensive than the partial and common offset CRS for large dataset.

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Seismic imaging of complex structures with the CO-CDS stack method

et al. 2016

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CRS-based Seismic Imaging in Complex Marine Geology

Cited by 1 publication

References 13 publications

Seismic imaging of complex structures with the CO-CDS stack method

Seismic imaging of complex structures with the CO-CDS stack method

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