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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: Previous HitDepthNext Hit Imaging a Previous Hit2-DNext Hit Saudi Aramco Seismic Line

Mike Hall, Valery Miroshnikov, Svetlana Bidikhova, and Yan Yan
GX Technology Canada Ltd, 2910, 400-4th Avenue S.W, Calgary, AB T2P 0J4, Canada, phone: 403-213-8765, fax: 403-263-9132, [email protected]

The near surface of certain parts of Saudi Arabia presents severe challenges for seismic exploration. This paper investigates various issues involved in performing pre-stack Previous HitdepthNext Hit Previous HitmigrationNext Hit (PreSDM) of a Saudi Aramco 2D line from a difficult area.

Prior to Previous HitdepthNext Hit imaging it is important to perform pre-conditioning of the data. This particular data contains quite severe surface wave energy that obscures the signal. The application of a filtering technique that successfully attenuates this is demonstrated. It is also very important to obtain a good near surface velocity model prior to Previous HitdepthNext Hit Previous HitmigrationNext Hit. A successful application of refraction tomography will be shown. This technique is strongly dependent on the timing accuracy of the first arrivals. Picking of first arrivals in this data is difficult; an approach to displaying these for both picking and quality control will be described.

The seismic resolution is enhanced within the Vibroseis signal bandwidth using a novel deconvolution technique. PreSDM is then performed on the conditioned seismic data. The most important aspect of PreSDM is building an accurate interval velocity Previous HitdepthNext Hit model. Several techniques will be shown to obtain this model using both layered and gridded approaches. The advantages and disadvantages of these techniques will be demonstrated. It will also be shown how these techniques may be used together to build the interval velocity in an optimal manner. The effects of performing constrained tomographic inversion in the Previous HitdepthNext Hit domain will be demonstrated. Finally the effects of parameterisation of the Previous HitmigrationNext Hit will be shown as will results from different Previous HitmigrationTop algorithms.

 

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