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AAPG Bulletin, Vol. 90 (2006), Program Abstracts (Digital)

7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006

ABSTRACT: CRS-Stack-Based Seismic Imaging Considering Top-Surface Topography

Z. Heilmann, M. Von Steht, I. Koglin, T. Klüver, and C. Jäger
Geophysical Institute, University of Karlsruhe, Hertzstr. 16, 761 87 Karlsruhe, Germany

Summary. In the current situation of rapidly growing demand in oil and gas, on-shore exploration, even under difficult conditions, becomes again more and more important. Unfortunately, rough top-surface topography and a strongly varying weathering layer often result in poor data Previous HitqualityNext Hit, which makes conventional data Previous HitprocessingNext Hit very difficult to apply.

As recent case studies demonstrated, the Common-Reflection-Surface (CRS) stack produces reliable stack sections with high resolution and superior signal-to-noise ratio compared to conventional methods. Particularly for land data, the increased computational expense required by the generalized high-density velocity analysis preceding the CRS stacking process may be worthwhile. In order to define optimal spatial stacking operators, the CRS stack extracts for every sample of the zero offset (ZO) section an entire set of physically interpretable stacking parameters. These so-called kinematic wavefield attributes, obtained as a by-product of the data-driven stacking process, can be applied to solve various dynamic and kinematic stacking, modeling, and inversion problems. By this means, a very flexible CRS-stack-based seismic reflection imaging workflow can be established. Besides the CRS stack itself, the main steps of this Previous HitprocessingNext Hit workflow are residual static correction, the determination of a macrovelocity model via tomographic inversion and limited aperture Kirchhoff migration.

The presented extension of the CRS-stack-based imaging workflow provides support for arbitrary top-surface topography. Both CRS stack and also CRS-stack-based residual static correction are applied to the original prestack data without the need of any elevation statics. Finally, a redatuming procedure relates the CRS-stacked ZO section, the kinematic wavefield attribute sections, and the Previous HitqualityNext Hit Previous HitcontrolNext Hit sections to a chosen planar measurement level. Thus, an ideal input for a preliminary interpretation and subsequent CRS-stack-based Previous HitprocessingTop steps is provided.


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