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Abstract
This paper is to study the structural framework, stratigraphy, and the petro-physical
characteristics of Facha reservoir of Gir Formation in Aswad oil field, which is located in
Block NC74B at the Zella Trough, south-west of Sirt basin, Libya. The data used have
been got from well-logging records of nine exploratory wells distributed in Aswad oil
field. These data have been analyzed and interpreted through using analytical cross-plots in
order to calculate the petro-physical parameters. The results revealed that the lithological
facies consists mainly of dolomite. Moreover, they revealed that the lateral distribution of
the petro-physical parameters of Facha reservoir indicates that average porosity is 10-23%,
average water saturation is 52- 93%, and net pay is of 62.44 ft. This shows that Facha
member is a good reservoir rock. The variations in values between wells have been
affected by the trend of faults; this indicates that the area is structurally controlled.