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Unconventional resources have been widely discovered within the Ordovician rocks (Hamra Quartzite reservoir) of a number of basins in Algeria, including the giant Hassi Messaoud oil-field. This study aims to provide an appraisal of the major characteristics of the Hamra Quartzite reservoir within the southern peripheral area of the Hassi Messaoud field. Petrographically, quartz grains in this reservoir are considered to be mature quartz arenites characterized by pervasive quartz overgrowth. Reservoir porosity is dominated by secondary intergranular dissolution porosity. The diagenetic sequence of the Hamra Quartzite reservoir occurred in three phases: eodiagenesis (early), mesodiagenesis (mid), and telodiagenesis (late) phases. These phases are directly related to tectonic events that affected the study area, and are controlled mainly by the Hercynian unconformity. The Hamra Quartzite reservoir was highly silicified during the pre-Hercynian phase. Compaction and cementation are the principal factors controlling reservoir degradation. The reservoir is faulted and fractured, and fractures ranging from partially open to closed are observed in cores. Petrophysically, the reservoir displays low porosity and permeability values. However, moderately porous and permeable sandstone is present toward the southeastern part of the studied reservoir.
Algeria is heavily reliant on its hydrocarbon sector, which accounts for 70% of its government budget revenues. However, in recent years, crude oil production has been stagnant and natural gas production has gradually declined on account of consistent delays in new production and infrastructure projects. In addition, in the last licensing rounds, there has been limited interest from foreign investors to undertake new oil and gas projects under the government's current terms such as stringent financial terms and windfall taxes. On the other hand, petroleum experts have related this limited interest to the lack of hydrocarbon potential of the blocks offered, rather than unattractive fiscal terms. In February 2013, the Algerian parliament amended the country's hydrocarbon law and introduced fiscal incentives to entice foreign companies to undertake new ventures, particularly in the exploration of unconventional resources, both onshore and offshore.
This paper presents a mathematical model of an inventory system from the warehouse of goods Distribution Company using system identification approach. Considering items ordered from suppliers and items shipped to customers, as the inputs of the system and the stock level as the output system. In this paper, ARX model and ARMAX model are outlined and compared. The performances of each type of model are highlighted. A case study with real data set is discussed.
The central composite design (CCD) technique was used to study the effect of the native species Lemnagibba on the removal heavy metals from the mixture of heavy metals, and understand their impact on theprocess. The effects of Cd, Cr, Cu, Zn, and Ni cations, incubation period and fronds number on heavymetals removal (Cd, Cr, Cu, Zn, and Ni) were studied, and the results were statistically analyzed using JMP9.0.2 (SAS Institute) software. The analysis aimed at giving a mathematical model that shows theinfluence of each variable. Each factor has a distinct effect on heavy metal removal. High correlation wasfound between the experimental and predicted results, reflected by R2 (coefficient of determination).
We report the transformation of electronic structures of sp^2 graphene to sp^3 graphene by UV-light-assisted oxidation. Two distinctive oxidation mechanisms were observed during this metal–insulator transition: (i) At low-oxidation regime, p-doping behavior by oxygen species extracting electrons from graphene and (ii) at high-oxidation regime, n-doping behavior by electron-hopping via strongly localized oxide states. We also found that the dominant oxygen-related functional group by UV-light-assisted oxidation was an epoxide group rather than hydroxyl group, which differed from conventional graphite oxide.