Contribution of 3D seismic delineation of the transition zone Ketatna-lower Salammbô in the Ashtatr oil field (Gulf of Gabes- South East Tunisia)

Abstract

The aim of this work is to highlight the existing structures in the fields Ashtart (Gulf of Gabes in South East Tunisia) and particularly those in the eastern part of the age Oligo - Miocene through analysis and interpretation of seismic data. Indeed, by basin on biostratigraphic and geophysical data, the contribution of seismic attributes in the delimitation of the distribution of deposits during this period has been demonstrated.

Along seismic sections, two horizons were clearly identified (based on the calibration on the oil wells) and successively representing the top Ketetna (H25) and the base lower Salammbô (H50). The isochronous maps of these two as well as seismic attributes (amplitude, frequency and apparent polarities) revealed the existence of three structures may constitute prospects and leads to various oil importances. A first area recognized as the platform to the west and attributed to the formation Ketatna (limestone), a second much deeper area to the east is attributed to the lower Salammbô formation and a third NNW -SSE zone interpreted as the transition between the two previous areas.

AAPG Datapages/Search and Discovery Article #90226 © 2015 European Regional Conference and Exhibition, Lisbon, Portugal, May 18-19, 2015