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Multi-component 3D Seismic - A Successful Fracture Characterization in Algeria-Interpretation of Faults and FracturesNormal access

Authors: J.L. Piazza, M. Donati, F.D. Martin, J. Castro, C. Gordillo, A. Bouheouira, T. Belhouchet, A. Müller, E. Ramia, S. Baillon, D. Marin and V. Belz
Event name: 76th EAGE Conference and Exhibition 2014
Session: Multi-component Case Studies
Publication date: 16 June 2014
DOI: 10.3997/2214-4609.20140638
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 2.55Mb )
Price: € 20

Summary:
This paper describes the structural interpretation and the anisotropy analysis performed to characterize the fracture network using 3D-3C seismic data acquired as part of a 67km² pilot survey in the Tin Fouyé Tabankort-West field located in the Illizi Basin in the Algerian Sahara. The target horizon corresponds to the Ordovician reservoirs composed of low porosity gas bearing sandstones located at a depth of approximately 1950 m below surface. Well data show that the well performance is mainly controlled by the reservoir facies but faults and fractures are also thought to play a role in the gas production. Based on a well controlled 3D-3C acquisition and a careful processing sequence of the PP and PS waves, this multi-component survey is proved to provide a better resolution of subtle faults and lineaments than the conventional 3D data seismic set available in the area even though the noise level remains slightly higher. Furthermore, the PS wave processing shows the evidence of shear wave splitting which is compensated to obtain an optimum radial component stack. The PS wave anisotropy, found to be consistent with the faults and lineaments interpreted on the PP seismic data set and with the FMI information in the wells, is interpreted in terms of fractures. The promising results of this 3D Multi-component seismic pilot provide an encouraging basis for wider 3D-3C acquisitions in areas where faults and fractures play an important role in the hydrocarbon production.


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