CONSTRUCTING A THREE-DIMENSIONAL GEOLOGICAL MODEL OF THE HAWAZ FORMATION IN J-OIL FIELD, NC-186, MURZUQ BASIN, LIBYA

This study examines the petrophysical properties of the Hawaz reservoir in the J-Field of Concession NC186, situated in the northern Murzuq Basin. It aims to build a geological and petrophysical model of the Hawaz reservoir using Schlumberger Petrel software and well-logging data to assess reservoir quality. The Hawaz Formation is subdivided into three units: upper, middle, and lower. The petrophysical properties of the Hawaz reservoir were analyzed for six wells: J1-186, J2-NC186, J6-NC186, J7i-NC186, J12-NC186, and J25-NC186. Techlog software was used to calculate additional petrophysical data from digital well logs. Geological and petrophysical models were created using Schlumberger Petrel to assess and understand reservoir quality and petrophysical characteristics, utilizing available wireline data, including gamma-ray (GR), neutron (N), density, resistivity (Res), and sonic logs, formation tops, and core studies. The results indicate that the Hawaz reservoir sandstone exhibits good reservoir quality, with an average porosity of 11%, a shale volume of 10.3%, and water saturation of up to 39.6%. Water saturation is higher in the southeast, around well J25-NC186, and decreases towards the northwest, around well J12-NC186. The 3D property model divides the Hawaz reservoir into six distinct units (H1, H2, H3, H4, H5, and H6). Units H2, H3, and H4 are considered active zones with favorable petrophysical properties (Sw, φ) and significant hydrocarbon content, while Units H1, H5, and H6 exhibit high water saturation and low net pay thickness. This trend is reflected in the spatial distribution of water saturation, with high values around well J25-NC186 in the southeast and decreasing values around well J12-NC186 in the northwest. Based on the 3D property model, Units H2, H3, and H4 are identified as the most promising zones due to their superior petrophysical properties and hydrocarbon saturation, while Units H1, H5, and H6 are less prospective due to their low net pay and high water saturation. Keywords: Hawaz Reservoir, Petrophysical Properties, 3D Property Model, Reservoir Quality, Murzuq Basin.