Comparative study between well logging and core analysis of Hawaz reservoir in Murzuq Basin, Libya

• The quick look interpretations of well logging data and their output calculations with crossplots are highly concordant with the core petrophysical parameters.
• The calculated density indicates that this reservoir is only oil–water bearing zone.
• The analysis has shown the importance of the horizons H4–H6 as oil bearing zones, while H7–H8 are water bearing horizons.

Murzuq Basin is one of the most important basins in Libya. It has many oil fields; H-field is one of the new discoveries in NC-186 concession in Murzuq Basin, Libya. This field has been affected by the structural and tectonic movements of Murzuq Basin and created paleo-high during the post-Hawaz erosional events. Ten exploratory wells were drilled for that field and well logging data were collected. The well logging data include Self potential, Gamma ray, Calipee, Resistivity, and Porosity logs (sonic, neutron, density). The recorded well logging data have been used for quick look interpretation and then correlated with both core data report and the plotted crossplots. The quick look results indicate that this reservoir is clean, highly porous and permeable. This reservoir is divided into 8 units/horizons (from H1 to H8), which are mainly sandstone with few intercalations of clay. Both well logging and core data are highly concordant. The results of the petrophysical characteristics have ascertained that H4–H6 are oil bearing zones while H7–H8 are water bearing horizons.