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Residual and Commercial Gas Discrimination by Spectral Decomposition Using Ultra-Far Stacked Seismic Data, Nile Delta, EgyptNormal access

Authors: W. Fathy and A. Shams
Event name: Second EAGE Eastern Mediterranean Workshop
Session: Exploration Opportunities I
Publication date: 20 November 2019
DOI: 10.3997/2214-4609.201903158
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 5.16Mb )
Price: € 20

Summary:
One of the big challenges facing operators in the on-shore Nile Delta is the discrimination between residual gas saturations and mobile commercial gas. The application of spectral decomposition and frequency attributes on pre-stack seismic data has opened the door to think about the relationship between frequency attenuation and reservoir properties. The main motivation of this study is the existence of a potential accumulation, with a very good seismic response, extremely comparable to that observed in a major producing field nearby. The results of a well drilled in this prospect were not encouraging and the well was classified as a dry well with gas shows (gas saturation in the tested reservoir reached 28%). We will see in this study how spectral decomposition can be used to discriminate between low gas saturations and mobile, commercial gas in the area of study.


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