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title of the reference :
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Microporosity influences on the quantitative log analysis in Cercina field
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Publication Date:
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1998
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Author :
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Rassas S.
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Catalogue type :
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Livre
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Catalogue reference :
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Microporosity influences on the quantitative log analysis in Cercina field The nummulitic reservoir named lower REINECHE in CERCINA field is a 10 m thick Limestone having an average total porosity of 23% and an average effective porosity equal to 12%. The analysis of reservoir core samples with the scanning electronic microscope revealed the presence of a large amount of microporosity within the Limestone matrix and the nummilitic grains filled by irreductible water. The main effects of this microporosity is seen on the resistivity log which reads very low values and, consequently, gives us high water saturation results obtained by the conventionnal log analysis method, unconsistant with the production data wells and behaviour. A relationship was built between the total porosity calculed from logs and the effective porosity by using mercury injections tests on core samples. In the oil producer wells, the water saturations decreases from an average of 78% calculated with a total porosity log to an average of 30% when we use the effective porosity only.
Lutétien; porosité ; microscopie électronique ; saturation ; roche mère hydrocarbure ; Tunisie ; Cercina permit Rassas S. Roches sédimentaires
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Indexation decimale :
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Roches sédimentaires
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Keywords :
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Lutétien; porosité ; microscopie électronique ; saturation ; roche mère hydrocarbure ; Tunisie ; Cercina permit
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Summary :
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The nummulitic reservoir named lower REINECHE in CERCINA field is a 10 m thick Limestone having an average total porosity of 23% and an average effective porosity equal to 12%. The analysis of reservoir core samples with the scanning electronic microscope revealed the presence of a large amount of microporosity within the Limestone matrix and the nummilitic grains filled by irreductible water. The main effects of this microporosity is seen on the resistivity log which reads very low values and, consequently, gives us high water saturation results obtained by the conventionnal log analysis method, unconsistant with the production data wells and behaviour. A relationship was built between the total porosity calculed from logs and the effective porosity by using mercury injections tests on core samples. In the oil producer wells, the water saturations decreases from an average of 78% calculated with a total porosity log to an average of 30% when we use the effective porosity only.
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