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Abstract
This study has been carried out by the integration of seismic interpretations and the well logging analysis of ten wells distributed in J-field of concession NC-186, Murzuq basin, Libya.
Twenty (3D) seismic lines and ten wells have been analyzed. The results of this study indicated that, the main reservoir in this concession is Hawaz Formation. Hawaz has been split into 8 units with a subdivision of Hawaz H4 into three subunits with the objective of better characterization of the three general fine upward intervals. The lower interval of H4 zone presents the better reservoir
properties. The depth of reflector H4 ranges from 4100 ft in the northwestern part of the study area
and increases to 4600 ft in the southeastern part of the study area. In this study, the outline of the
Hawaz paleohighs which is NC-186 Field ‘‘J” is generally trending in the NW-SE direction. The
well logging analysis particularly quick look interpretation indicates that Hawaz Formation in
the studied wells is mainly oil-bearing with some water-bearing sand levels at the horizons from
H4 to and H6 which are potentially the main reservoirs. The water bearing zones are beyond these
horizons starting from the sub-horizon H6c and the oil water contact is probably at depth 4495 ft.
The crossplot of porosity-saturation for H5 and H6b indicates firmly that these horizons are indeed
at irreducible state and will produce mainly oil as indicated in J4-NC186 well, while the crossplot of H8 shows wide scattering of points which is the main characteristic for water producing horizon.