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<p>The present study constitutes an evaluation of a secondary target reservoir consisting of the TAGI sandstone Formation. In this purpose, sequential stratigraphy and petro-physical analysis results were utilized to reevaluate reservoir quality and the potential for hydrocarbons. The sequential stratigraphy, using GR data, has revealed that the TAGI reservoir is composed of nine sequences, which in turn host the five known reservoir levels (A, B, C, D, and E). Based on the bell-shaped and sequences, the frequent presence of shales, and the lenticular shape of sand bodies, the depositional environment is interpreted as a terrestrial fluvial meandering to sub-meandering system. The paleo-geographic outputs are consistent with a basin located to the northeast, indicating the direction of the deltaic sedimentary environment, which is potentially more substantial in thickness and may exhibit higher sand/shale ratios. The petro-physical interpretation using the Interactive Petrophysics software indicates high water saturation, ranging from 30 to 60%, in most of the studied reservoirs where porosity exceeds 20%. The petro-physical analysis supports the potential for hydrocarbon accumulation in the TAGI reservoirs, which requires validation through in situ pressure pretests. Furthermore, the sequence stratigraphy results provide a clearer understanding of reservoir connectivity and geometry, offering valuable insights to guide and optimize future exploration campaigns.</p>

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Petrophysical evaluation and sequential stratigraphic analysis using logging data: a case study of the TAGI reservoir in southern Tunisia

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Riadh Ahmadi,
  • Hadil Gueraaichi,
  • Chaouki Khalfi,
  • Sana Garci

摘要

The present study constitutes an evaluation of a secondary target reservoir consisting of the TAGI sandstone Formation. In this purpose, sequential stratigraphy and petro-physical analysis results were utilized to reevaluate reservoir quality and the potential for hydrocarbons. The sequential stratigraphy, using GR data, has revealed that the TAGI reservoir is composed of nine sequences, which in turn host the five known reservoir levels (A, B, C, D, and E). Based on the bell-shaped and sequences, the frequent presence of shales, and the lenticular shape of sand bodies, the depositional environment is interpreted as a terrestrial fluvial meandering to sub-meandering system. The paleo-geographic outputs are consistent with a basin located to the northeast, indicating the direction of the deltaic sedimentary environment, which is potentially more substantial in thickness and may exhibit higher sand/shale ratios. The petro-physical interpretation using the Interactive Petrophysics software indicates high water saturation, ranging from 30 to 60%, in most of the studied reservoirs where porosity exceeds 20%. The petro-physical analysis supports the potential for hydrocarbon accumulation in the TAGI reservoirs, which requires validation through in situ pressure pretests. Furthermore, the sequence stratigraphy results provide a clearer understanding of reservoir connectivity and geometry, offering valuable insights to guide and optimize future exploration campaigns.