--> Improved AVO Analysis Based on the CRS Method
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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: Improved Previous HitAVONext Hit Analysis Based on the CRS Method

Henning Trappe1 and Juergen Pruessmann2
1 TEEC, Burgwedelerstr. 89, Isernhagen HB, 30916, Germany, phone: +49 511 7240452, fax: +49 511 7240465, [email protected]
2 TEEC, Burgwedeler Str. 89, Isernhagen, D-30916, Germany

The Common-Reflection-Surface (CRS) method which was developed in recent years, has increasingly been used for the high resolution imaging of complex subsurface structures. Assuming subsurface reflector elements with dip and curvature, the CRS method renders a better signal-to-noise ratio and additional subsurface information in comparison to conventional NMO/DMO time domain imaging. These advantages of the CRS method, however, may as well be used for an improved Amplitude Previous HitVersusNext Hit Offset (Previous HitAVONext Hit) analysis. A conceptual case study shows that the more realistic subsurface assumptions, and the increased fold of the CRS imaging, allow to extend Previous HitAVONext Hit analysis into noise zones. The signal-to-noise ratio of the CRS Previous HitAVONext Hit Previous HitgradientNext Hit stack is much higher than in conventional Previous HitAVONext Hit. Extreme fluctuation of Previous HitAVONext Hit parameters is removed, and Previous HitAVONext Hit anomalies are enhanced. In the case study, the CRS Previous HitAVONext Hit Previous HitgradientNext Hit stack clearly distinguishes an anomaly at a known gas bearing reservoir. Small anomalies above the reservoir disappear, indicating that they were due to local noise contamination. Cross plots of the Previous HitAVONext Hit intercept Previous HitversusNext Hit Previous HitgradientNext Hit show a better separation of anomalous zones which may be classified in order to identify top and base of hydrocarbon deposits. Based on the local CRS imaging solution, the general increase of the signal-to-noise ratio imply an improved Previous HitAVONext Hit analysis by CRS for many types of data. Large benefits of CRS Previous HitAVOTop is especially expected in areas of strong dip, and at deep targets with a low signal-to-noise ratio.

 

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