Time filter

Source Type

Algiers, Algeria

Sonatrach is an Algerian government-owned company formed to exploit the hydrocarbon resources of the country. It has some concessions in Libya, Mauritania, Peru, Yemen and Venezuela. Its diversified activities cover all aspects of production: exploration, extraction, transport, and refining. It has diversified into petrochemistry and the desalination of seawater. Wikipedia.

Hadj Ammar S.,Sonatrach
International Gas Research Conference Proceedings | Year: 2014

In the transactional metering of the natural gas, the quantities delivered to the customers are estimated by their energy value, while the flows are generally expressed in volume on reference conditions. The difference between the use of the standard (1 atm, 15°C) and contractual (1 bar, 15°C) conditions was evaluated by referring to existing standards in the field of gas metering, in this particular case standard ISO 6976 for the calculation of the heating value, the density, and the Wobbe index as well as standard ISO 5167 for the measure of the flow of fluids by means of orifice plate devices. The gross calorific value calculated at standard conditions is higher than that calculated with contractual conditions. The volumetric flow rate calculated with the contractual conditions is greater than that calculated under standard conditions. The use of contractual conditions makes a profit in the transactions with customers. This is an abstract of a paper presented at the International Gas Union Research Conference (Copenhagen, Denmark 9/17-19/2014). Source

Djeridane B.,Sonatrach
International Gas Research Conference Proceedings | Year: 2014

The impact of a cyber-attack on the distributed control system in compressor stations of gas pipeline transportation system was studied. A new approach was developed to address the problem of dealing with threats by making the controller more clever to detect any threat might come from the IT infrastructure of gas facility. This approach was tested numerically using computational tools based on viability. The results revealed the weaknesses of the system and indicated that a possible policies to attack that an attacker could use to disturb it. This is an abstract of a paper presented at the International Gas Union Research Conference (IGRC 2014) (Copenhagen, Denmark 9/17-19/2014). Source

Berri J.,Sonatrach
2010 5th International Conference on Digital Information Management, ICDIM 2010 | Year: 2010

User initiated interactions in social networks and web services generate Collective Intelligence that is exploited in many web applications to shape output toward a better adaptation of users' information needs. Most of data involved in these interactions consists of multimedia information that needs to be identified, described and managed efficiently in order to be retrieved and shared on the web. This article proposes a framework which makes use of distributed multimedia web resources for a variety of web applications. Web resources are described formally by ontologies which are generated from available web information sources. ©2010 IEEE. Source

Roure F.,French Institute of Petroleum | Addoum B.,Sonatrach
Tectonics | Year: 2012

This paper aims at summarizing the current extent and architecture of the former Mesozoic passive margin of North Africa from North Algeria in the west up to the Ionian-Calabrian arc and adjacent Mediterranean Ridge in the east. Despite that most paleogeographic models consider that the Eastern Mediterranean Basin as a whole is still underlain by remnants of the Permo-Triassic or a younger Cretaceous Tethyan-Mesogean ocean, the strong similarities documented here in structural styles and timing of inversion between the Saharan Atlas, Sicilian Channel and the Ionian abyssal plain evidence that this portion of the Eastern Mediterranean Basin still belongs to the distal portion of the North African continental margin. A rim of Tethyan ophiolitic units can be also traced more or less continuously from Turkey and Cyprus in the east, in onshore Crete, in the Pindos in Greece and Mirdita in Albania, as well as in the Western Alps, Corsica and the Southern Apennines in the west, supporting the hypothesis that both the Apulia/Adriatic domain and the Eastern Mediterranean Basin still belong to the former southern continental margin of the Tethys. Because there is no clear evidence of crustal-scale fault offsetting the Moho, but more likely a continuous yet folded Moho extending between the foreland and the hinterland beneath the Mediterranean arcs, we propose here a new model of delamination of the continental lithosphere for the Apennines and the Aegean arcs. In this model, only the mantle lithosphere of Apulia and the Eastern Mediterranean is still locally subducted and recycled in the asthenosphere, most if not all the northern portion of the African crust and coeval Moho being currently decoupled from its former, currently delaminated and subducted mantle lithosphere. Copyright 2012 by the American Geophysical Union. Source

Soliva R.,Montpellier University | Maerten F.,Montpellier University | Petit J.-P.,Montpellier University | Auzias V.,Sonatrach
Journal of Structural Geology | Year: 2010

Fault friction is a parameter that is difficult to assess along fault zones since its determination depends on the knowledge of any factor controlling the state of stress around faults. In brittle homogeneous rocks, a limited number of these factors, such as the shape of the fault surface, the vicinity of fault tips or the remote stress ratio, are crucial to constrain for this determination. In this paper, we propose to analyse a field example in which all these properties are met and where the nature of the slipped structure suggest differences in static friction. We compare the orientations of branching fractures at strike-slip relay zones between en echelon stylolites and en echelon joints both reactivated in shear. The field data are compared with both photoelastic and 3-D numerical models that consider the remote stress conditions and the role of the geometry of the strike-slip segments. Based on field observations, these analyses quantitatively demonstrate the significant role of fault friction on the local stress field orientation and subsequent fracture formation. This work points out that estimations of fault friction based on analyses of fracture patterns or in situ stresses must be accompanied with a thorough investigation of the 3-D fault shape, its segmentation and the remote stress state. © 2010 Elsevier Ltd. Source

Discover hidden collaborations