Reservoir quality and expected fluids for the Ordovician Hawaz sandstone in the NC186 Concession, Murzuq Basin, Libya
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S. I. SCJGE-1 2019
Reservoir quality and expected fluids for the Ordovician Hawaz sandstone in the NC186 Concession, Murzuq Basin, Libya Mohammad Abdelfattah Sarhan 1 & Ahmad Mohammad Kamal Basal 1 & Ismail Ali Amhimmid Alabdi 1 Received: 21 June 2019 / Accepted: 9 October 2019 # Saudi Society for Geosciences 2019
Abstract The present work evaluates the Middle Ordovician Hawaz sandstone reservoir in four wells (A25-NC186, A30-NC186, H2NC186 and H4-NC186) distributed in the NC186 Concession of Murzuq Basin, Libya. The available well log data set for each well includes: gamma ray, calliper, spontaneous potential, resistivity, density, neutron, sonic, density correction and photoelectric logs. These data have been qualitatively interpreted using Interactive Petrophysics (IP) software and quantitatively analysed by calculating different petrophysical parameters comprising; water saturation, minimum bulk volume of water, absolute permeability, critical water saturation, pressure gradient and fluid density for the promising horizons. The quantitative interpretation has revealed that three horizons (H4, H5 and H6) are suitable for further quantitative interpretation. The calculated petrophysical parameters for these horizons show that all of the studied zones represent oil reservoirs in an irreducible state (i.e. water-free oil production). This finding indicates that the remaining water is located on the pore surfaces as thin films and will not move through the production process. The results reflect excellent reservoir quality for all examined zones, including high porosity (10–26%), high permeability (42–2824 mD), low water saturation (12–43%) less than the critical water saturation (31–45%) and low BVW (0.02–0.06) less than BVWmin (0.07). Keywords Reservoir quality . Hawaz Formation . NC186 Concession . Murzuq Basin
Introduction Murzuq sedimentary basin has the highest residual hydrocarbon potential among all the basins of Libya (Bertello et al. 2003). This basin locates in the south-western part of Libya (Fello and Turner 2001) covering an area of approximately 350,000 km2 (Fig. 1). The basin has a thick Palaeozoic marine sedimentary succession that is unconformably overlain by continental Mesozoic and Quaternary sediments (Fig. 2). The sedimentary section reaches a maximum thickness of over 4000 m in the basin centre and thins to approximately 2200 m along the flank. Murzuq Basin was affected by the middle Palaeozoic Caledonian and the Post-Oligocene Alpine tectonic events (Bellini and Massa 1980), as shown in Fig. 2. This article is part of the Topical Collection on Current Advances in Geological Research of Egypt * Mohammad Abdelfattah Sarhan [email protected]; [email protected] 1
Geology Department, Faculty of Science, Damietta University, New Damietta City 34517, Egypt
The NC186 Concession lies on the north-western flank of Murzuq Basin covering an area of 4295 km2 between latitudes 26° 40′ and 27° 00′ and longitudes 12° 00′ and 13° 10′. Two oil fields, named A and H fields, in the NC186 Concession have b
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