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|b The O field located in north north west of Murzuq basin, NC 115 Concession, The main objectives of this study were to identify the reservoir properties of the Hawaz Formation. A detailed sedimentological and fracture description with the identification of significant stratal boundaries, The description included determination of the lithology, grain-size, sorting, color, sedimentary structures, bed contacts and to describe the vertical distribution of sedimentary facies and provide an interpretation of the depositional environments in terms of sequence analysis. A petrographic description on selected samples, including SEM and thin section analysis, to characterize detrital and authigenic mineral composition and diagenetic processes of identified facies, in relation to porosity. The reservoir is sealed by Tanezzuft shale, which is as a source rock also The average porosity of this reservoir sandstone ranges between 11 to 15 % ,The water saturation is ranging from 21 to 24 %.also based on petrophysices method, one well study (O1) have been selected to support the results that obtained from petrography study to get more results such as lithology identification, porosity, permeability and mineral composition also to calculate the reservoir properties such as volume of shale, water and oil saturation, oil water contact and reservoir reserves, the initial oil in place is 804 MMSTB and the recoverable reserve is 178.5MMSTB.
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