Contribution of seismic attributes in the direct detection of hudrocarbon, case history of a permit in the south algerian sahara

The zone of interest is located in an important oil and gas zone; ils position near Berkine and Illizi basin makes it very important. Our study is based on the data collected on two seismic Hnes, according ta the lines A and B, which intersect on well-2. The present work is based on the study of the contribution of the seismic attributes, in particular the amplitude attribute presented by the A VO method, to the direct hydrocarbons detection. The use of the seismic attributes and above aIl the A VO method becomes very widespread those latest years. With this study wc wanted to show the sturdiness and the supply the additional information that can bring those attributes. We checked, in spite of the very po or quality of the data and the high noise level, that having recours ta attributes such as amplitude, frequency and phase yields an invaluable information concerning the nature ofthe fluid, the continuity of the reflectors. the localisation of the discontinuities etc ... ; many anomalies were localised in diverse places along the two profiles; those anomalies may be used like a mark during the future studies on the region. (Note: due to the confidentiality of the data, authors have kept seismic hnes and wells anonymous