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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

EXTENDED ABSTRACT: Qatif 3D Survey: A Case History of a Large Transition Zone Survey

AbdulRahim A. Mubarak, Ralph Bridle, Hashim Hussein, Robert Ley II, and William L. Weibel
Saudi Aramco

In pursuit of structural imaging and stratigraphic understanding of a producing Jurassic carbonate reservoir, Saudi Aramco is acquiring 1300 km2 of 3D transition seismic data. Challenges begin with the variety of topographies including sand dunes, sabkhas, transition zone marshes, shorelines, and shallow water depths finishing with deeper marine zones. In addition, the land portions contain very densely populated towns, large agricultural areas and huge power plants. All of these issues demand the application of critical and accurate steps in order to ensure a seamless product free of false structures and processing artifacts.

The acquisition includes four independently configured source types; dynamite, vibrator, shallow and deep Previous HitairNext Hit Previous HitgunTop. Associated with these are the different seismic receiver types; geophones, marsh phones, hydrophones and dual sensors, Figure 1. These produce an extremely complex processing environment, with unique challenges which must be met before producing a final volume for successful interpretation. This unique multi-environment processing task requires instrument matching, source matching, dual sensor summation, generation of datum statics corrections for various source and receivers, noise handling for different conditions, velocity analysis, and pre-stack time migration. The time slice extraction from the final volume, Figure 2, shows no source or receiver footprint due to the irregular shooting geometry and transition zone conditions.

This paper will show how the integration of all the different variables in processing produces a final migrated dataset suitable for the interpretation objectives.

Figure 1. Aerial Distribution of Source and Receiver Types.

Figure 2. Time Slice at 600 ms.

 

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