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Argyelan-Bagoly G.,MOL Hungarian Oil and Gas Plc | Magyari A.,Geological Institute of Hungary | Al-Wardi M.,Sultan Qaboos University
GeoArabia | Year: 2010

This paper presents field observations and measurements from the Hawasina Window, Oman Mountains. An updated geological map is based partly on previous publications and four NEtrending cross-sections. Along each cross-section key structural features are described, illustrated and interpreted. Based on these (and other) observations several differences between our interpretation and the former published geological maps and cross sections were noted as follows. (1) Late Cretaceous original (Hamrat Duru; Haybi) nappes that formed during intraoceanic obduccion underwent out-of-sequence thrusting beneath the Semail thrust. The repetitions of the nappe complexes are out-of-sequence because: (a) repetition of original nappe packages; (b) the presence of Haybi-derived lenses along boundaries between two Hamrat Duru nappes; (c) the presence of sheared serpentinite in the same nappe boundaries. The Hamrat Duru and Haybi nappes are repeated three times. (2) The tectonic boundaries of the Hawasina Window are steep, normal- or strikeslip faults, unconformable to, and cutting the original nappe boundaries. A main strike-slip corridor at the southern edge of the Hawasina structure was mapped. The northern edge is a top-north thrust. (3) Ductile-brittle extension created mega-boudins of preserved nappe units and areas where complete nappe units are missing. Extension is present in Sumeini and Hamrat Duru units; therefore it is post-out-of-sequence thrusting. (4) Two main antiforms were recognised inside the Hawasina Window (Jabal Rais and its northward and southward continuations in Hamrat Duru units, and Jabais Mawq - Matid). Several folding phases were recognised and the two antiforms are the result of interference. A main, sub-horizontal axial plane, syn-regional cleavage folding is present in the whole Window. This folding gives top NE or N regional shear. (5) Structural dips of regional cleavage suggest a major NW-striking dome beneath the Hawasina Window. This dome would correspond to the upwarp of the Autochthon, similar to Al Jabal al-Akhdar. In the southern zone of this dome we observed several occurrences of small gypsum diapirs. The best outcrops of these features are in the Wadi ad Dil-Wadi Hawasina area, where the evaporite bodies rise from beneath the Hawasina nappes. We suggest that they originate from the underlying Arabian Platform, or they form the basal detachment of the Sumeini units. Our observations are fit into a proposed deformation scenario resulting from plate-tectonic events occurring at the Arabian Plate margin during Cretaceous - Tertiary time. Source

Hancsok J.,University of Pannonia | Kasza T.,University of Pannonia | Kovacs S.,University of Pannonia | Solymosi P.,University of Pannonia | Hollo A.,MOL Hungarian Oil and Gas Plc
Journal of Cleaner Production | Year: 2012

The production possibilities of gas oil boiling-range mixtures of paraffins were investigated over different catalysts as a function of the process parameters using different natural triglycerides. Under favorable operational parameters (T: 360-380 °C; p: 60-80 bar; liquid hourly space velocity (LHSV): 1.0-2.0 cm 3 of feedstock/(hcm 3 of catalyst)), the yield of paraffin mixtures increased in the order NiW/Al 2O 3 < NiMo/Al 2O 3 << CoMo/Al 2O 3. In the best cases, the yields of paraffins reached 75-85% of the theoretical values. These compounds are excellent, environmentally sound fuels for diesel engines (cetane number: 89-92) and could be used either as pure fuels or as blending components. Copyright © 2012 Published by Elsevier Ltd. All rights reserved. Source

Benko M.,University of Szeged | Benko M.,Hungarian Academy of Sciences | Kiraly L.A.,University of Szeged | Puskas S.,MOL Hungarian Oil and Gas Plc | Kiraly Z.,University of Szeged
Langmuir | Year: 2014

We report on the inclusion complex formation of β-cyclodextrin (βCD) with a cocogem surfactant (counterion-coupled gemini surfactant; (bis(4-(2-alkyl)benzenesulfonate)-Jeffamine salt, abbreviated as ABSJ), studied by isothermal titration calorimetry (ITC) and surface tension (SFT) measurements. We measured the critical micelle concentration (cmc) of ABSJ in water by the two experimental techniques in the temperature range 283-343 K, and determined the thermodynamic parameters of the complex formation directly by ITC and indirectly by the SFT. The stoichiometry (N), the binding constant (K), and the enthalpy of complexation were determined, and the Gibbs free energy and the entropy term were calculated from the experimental data. A novel method is presented for the determination of N and K by using surface tensiometry. © 2014 American Chemical Society. Source

Kasza T.,MOL Hungarian Oil and Gas Plc | Kallo D.,Hungarian Academy of Sciences | Hancsok J.,University of Pannonia
Fuel | Year: 2014

Quality improvement of bio-paraffin by isomerization was studied in presence of fatty acid over Pt/SAPO-11 catalyst in order to produce second generation biogasoil. The reaction rates and activation energy of the isomerization having high importance in both reactor design and process control were determined. The increase of the fatty acid content of feedstock significantly decreased the rate of isomerization of bio-origin octadecane, but did not affect the activation energy being 143 ± 3 kJ/mol. Industrial application of the favourable results and the excellent quality properties of end products were also demonstrated. © 2013 Elsevier Ltd. All rights reserved. Source

Benko M.,University of Szeged | Puskas S.,MOL Hungarian Oil and Gas Plc | Kiraly Z.,University of Szeged
Adsorption | Year: 2013

The selective adsorption of the components of a polydisperse gemini surfactant blend (alkylbenzenesulfonate-Jeffamine salt, ABSJ) in aqueous solution onto Berea sandstone, a reference material in enhanced oil recovery (EOR), was investigated. The individual adsorption isotherms of the four, benzene-ring containing ABSJ components with different alkyl chain lengths (ranging from decyl to tridecyl of the alkyl chain length) were simultaneously determined by using a four-channel electrospay ionization mass spectrometer (ESI-MS) for concentration analysis. This analytical device provided selective information (based on the differences in the mass to charge ratio) on the adsorption of each component in the mixed surfactant system. The overall isotherm obtained from the superposition of the individual isotherms determined by ESI-MS agreed well with the isotherm determined by UV spectrometry; the UV equipment is benzene-ring sensitive, irrespective of the alkyl chain length. The S-shaped isotherms reached a plateau at the critical micelle concentration. Longer-chain surfactants adsorbed preferentially over the short chain homologs, independently of solution concentration. This analytical device provided the net adsorption isotherm. Most analytical methods are not component selective, and thus they are not able to measure the individual isotherms in multicomponent solutions. Here, we report on a novel method which describes the selective determination of the individual adsorption isotherms of surfactants in a multicomponent mixture. The theoretical background of the method is described in detail. © 2012 Springer Science+Business Media, LLC. Source

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