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<p>The Casamance-Bissau compartment is a sub-basin of the larger Senegal-Mauritania basin, of economic interest in the field of hydrocarbon exploration. It has been the subject of prospecting and exploration studies since the 1960s, requiring the use of advanced technologies and analytical methods. This study identified the petrophysical properties of the Maastrichtian reservoir, penetrated by 9 wells drilled in the AGC Shallow water zone. Gamma-ray analysis, sonic density, and resistivity measurements allowed us to determine the porosity and fluid saturation of the said reservoir. The Maastrichtian reservoir has thicknesses ranging from 6.8&#xa0;m to 134.7&#xa0;m. It consists of sandstones with excellent properties, including an average porosity of 28% and high permeabilities. A clay volume below 50% and minor traces of carbonate cement have been reported in certain wells in the reservoir section. The Upper Maastrichtian Reservoir is not present throughout the area, and no hydrocarbons were encountered. However, light oil with an API gravity of 33° was discovered in the deep Maastrichtian sandstones. The Upper Maastrichtian sandstones are widely spread in the region, as evidenced by wells previously drilled in Senegal and Guinea-Bissau. By exploiting detailed geophysical and geochemical data, we have developed a refined geological description of this region, highlighting the complex interactions between sedimentary structures and their petrophysical properties. This description not only allows for more precise predictions of the location and quality of hydrocarbon reservoirs but also offers prospects for more targeted and less invasive exploration.</p>

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Petrophysical analyses of the upper maastrichtian reservoir in the casamance-bissau area

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Khady Ndiaye,
  • Axel Tcheheumeni Djanni,
  • Ibrahima Ndiaye,
  • Mouhamadoul Bachir Diouf,
  • Papa Boucar Faye

摘要

The Casamance-Bissau compartment is a sub-basin of the larger Senegal-Mauritania basin, of economic interest in the field of hydrocarbon exploration. It has been the subject of prospecting and exploration studies since the 1960s, requiring the use of advanced technologies and analytical methods. This study identified the petrophysical properties of the Maastrichtian reservoir, penetrated by 9 wells drilled in the AGC Shallow water zone. Gamma-ray analysis, sonic density, and resistivity measurements allowed us to determine the porosity and fluid saturation of the said reservoir. The Maastrichtian reservoir has thicknesses ranging from 6.8 m to 134.7 m. It consists of sandstones with excellent properties, including an average porosity of 28% and high permeabilities. A clay volume below 50% and minor traces of carbonate cement have been reported in certain wells in the reservoir section. The Upper Maastrichtian Reservoir is not present throughout the area, and no hydrocarbons were encountered. However, light oil with an API gravity of 33° was discovered in the deep Maastrichtian sandstones. The Upper Maastrichtian sandstones are widely spread in the region, as evidenced by wells previously drilled in Senegal and Guinea-Bissau. By exploiting detailed geophysical and geochemical data, we have developed a refined geological description of this region, highlighting the complex interactions between sedimentary structures and their petrophysical properties. This description not only allows for more precise predictions of the location and quality of hydrocarbon reservoirs but also offers prospects for more targeted and less invasive exploration.