Corresponding Author


Document Type

Original Article

Subject Areas

Earth science




The present study deals with a comprehensive interpretation of the available digital well-log data of Belayim Land area,using a computer program (Interactive Petrophysics) to evaluate Sidri Member. The corresponding well-log data have beenprocessed through a sequence of graphical relations (manual interpretation) to evaluate quantitatively the different petrophysicalcharacteristics and also computerized through the available computer software. The manual interpretation was started bysubdividing the studied member (Sidri Member) into zones and the log readings were tabulated. These zones are correlatedbetween wells, according to their remarkable changes in the log responses and their similarity. Tri-porosity (M-N) cross-plotsfor mineral identifications are used to detect, in general, the types of lithology. Lithologic identification is achieved through thecross-plots between ρb, Øn and Δt, to detect the matrix density (ρma) and matrix interval transit time (Δtma) for each facies. Thesecharts show that the sandstone and shale represent the main components in Sidri Member. The mono-porosity cross-plots areconstructed to determine the water saturations (Sw), formation water resistivity (Rw) and sonic, neutron and density derivedporosities (Øs, Øn and Ød). Dia-porosity cross-plots were established to determine the shale volume (Vsh) and effective porosity(Øeff). All petrophysical characteristics, inferred from the previous steps, were represented vertically in the form of petrophysicaldata logs (PDL). The lateral variations of the petrophysical characteristics are represented in the form of iso-parametricmaps (effective thickness, shale content, effective porosity and hydrocarbon saturation). It is worth-mentioning that, also thelitho-saturation cross-plots illustrated from the computer processed interpretation are correlatable with the manual ones. Thepetrophysical characteristics of Sand3 (Sidri Member) reflect the ability of this unit to store and produce hydrocarbon. Effectiveporosity ranges between 12 and 24%, shale content varies from 0 and 27% and hydrocarbon saturation ranges between 75and 92%. The petrophysical characteristics of Sand2 (Sidri Member) reflect the ability of this unit also to store and producehydrocarbon. Effective porosity ranges between 3 and 20%, shale content varies from 0 and 52% and hydrocarbon saturationranges between 31 and 89%. Sand 1 (Sidri Member) petrophysical characteristics reflect high ability to store and producehydrocarbon more or less like Sand 3 unit. Effective porosity ranges between 14 and 24%, shale content varies from 0 and19% and hydrocarbon saturation ranges between 51 and 87%. It is clear that, Sand1 and Sand3 units show better reservoircharacterization than that of Sand2 unit.

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