Recent national and international demand for additional resources of the fossil fuel resulted in extensive hydrocarbon exploration activities in Egypt to further explore possible petroliferous rock units that were conventionally deemed as barren or having non-commercial reserves such as the Alam El Bueib Formation. This increased the stress to enrich the lithological correlation of this formation across the north Western Desert to better understand its regional lithological characteristics and thus its potential regional reservoir/source rock quality.
Palynostratigraphic analysis of Lower Cretaceous successions in the Tut-1X and Amoun-1X wells in the Shushan Basin, north Western Desert enabled the recognition of the upper Alam El Bueib Formation in both wells, in contrast to a previous study, which suggested non-deposition of this formation in the Amoun-1X well. This highlights the important role of the palynology as a key stratigraphic tool, which helped effectively in recognising this problematic monotone clastic formation, where other marine microfossils are lacking. This also shows that recognition of this formation based on lithological criteria only was impractical and misleading. Marker terrestrial and marine palynomorph taxa recovered from the upper Alam El Bueib Formation enabled dating it as late Barremian–early Aptian and were used to identify two palynological biozones that can be traced out regionally across the Shushan, Matruh, and other nearby basins. These biozones are the early Aptian Murospora florida–Afropollis operculatus–Pseudoceratium securigerum Assemblage Zone and the late Barremian Stellatopollis barghoornii–Pseudoceratium anaphrissum–Cyclonephelium vannophorum Assemblage Zone. An undifferentiated interval was recorded just below the upper Barremian strata in the Tut-1X well due to very low palynomorph recovery and absence of marker forms.
Composition of terrestrial and marine palynomorph assemblages suggests the upper Alam El Bueib Formation was deposited in fluvio–deltaic to proximal inner shelf settings. The Alam El Bueib Formation shows notable regional variations in thickness and considerable lateral and vertical changes in lithology due to local tectonics and relative difference in its depositional settings in the Shushan and Matruh basins. Regionally, the Alam El Bueib Formation shows dual reservoir/source rock characteristics, where thick and poorly fossiliferous sandstone units act as reservoir rocks, while moderately fossiliferous finer clastics and carbonates already acted as intraformational source rock intervals in some parts of the Shushan and Matruh basins.

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We presented here the fluctuation induced excess conductivity in Bi 1.7 Pb 0.3 Sr 2 Ca 2-x Y x Cu 3 Oy superconductors with various x values (0.00< x< 0.50). The logarithmic plots of excess conductivity (∆ σ) and reduced temperature (ε) reveal three different values of the order parameter dimensional exponents against a decrease of temperature corresponding to two different values of crossover temperatures. In the critical field region, the order parameter exponents are two dimensional (2D) as x increases up to 0.20, but it is changed to three dimensional (3D) with further increase of x up to 0.50. While, the order parameter exponents are not systematic with Y in both normal and mean field regions, and they are fluctuated between zero dimensional/short wave (0D/SW), qusi-2D, qusi-1D and 3D. On the other hand, the coherence lengths, inter-plane spacing, interlayer coupling, GL parameter and anisotropy are calculated and their values are generally increased by increasing x up to 0.50, whereas GL parameter, Ginsburg number, critical magnetic fields and critical current density are decreased. The possible reasons for the above findings are also mentioned.

We presented here the fluctuation induced excess conductivity in Bi 1.7 Pb 0.3 Sr 2 Ca 2-x Y x Cu 3 Oy superconductors with various x values (0.00< x< 0.50). The logarithmic plots of excess conductivity (∆ σ) and reduced temperature (ε) reveal three different values of the order parameter dimensional exponents against a decrease of temperature corresponding to two different values of crossover temperatures. In the critical field region, the order parameter exponents are two dimensional (2D) as x increases up to 0.20, but it is changed to three dimensional (3D) with further increase of x up to 0.50. While, the order parameter exponents are not systematic with Y in both normal and mean field regions, and they are fluctuated between zero dimensional/short wave (0D/SW), qusi-2D, qusi-1D and 3D. On the other hand, the coherence lengths, inter-plane spacing, interlayer coupling, GL parameter and anisotropy are calculated and their values are generally increased by increasing x up to 0.50, whereas GL parameter, Ginsburg number, critical magnetic fields and critical current density are decreased. The possible reasons for the above findings are also mentioned.

The normal and superconducting properties of Bi1.7Pb0.30Sr2Ca2−xLaxCu2Oy (Bi, Pb):2223 system with various x values (0.00 ≤ x ≤ 0.30) have been reported. It is found that the replacement of Ca2+ by La3+ up to 0.30 does not influence the phase purity of the pure system, while the orthorhombic distortion, excess oxygen, effective Cu valance and hole carriers/Cu ions are clearly affected. Further, the doping distance and crystal geometry factor are decreased, but the distance between neighboring Cu-atoms and density of excess doping are increased. Furthermore, the DTA diagrams show strong endothermic peaks Tm at 844.1, 848, 850.1 and 857.4 °C for pure and La samples, respectively. The mass loss determined by TGA displayed a sharp mass loss started at about 800 °C and extended to 1000 °C for all samples. Although the critical temperatures Tc of the samples are decreased by La insertion …

The normal and superconducting properties of Bi1.7Pb0.30Sr2Ca2−xLaxCu2Oy (Bi, Pb):2223 system with various x values (0.00 ≤ x ≤ 0.30) have been reported. It is found that the replacement of Ca2+ by La3+ up to 0.30 does not influence the phase purity of the pure system, while the orthorhombic distortion, excess oxygen, effective Cu valance and hole carriers/Cu ions are clearly affected. Further, the doping distance and crystal geometry factor are decreased, but the distance between neighboring Cu-atoms and density of excess doping are increased. Furthermore, the DTA diagrams show strong endothermic peaks Tm at 844.1, 848, 850.1 and 857.4 °C for pure and La samples, respectively. The mass loss determined by TGA displayed a sharp mass loss started at about 800 °C and extended to 1000 °C for all samples. Although the critical temperatures Tc of the samples are decreased by La insertion …

The normal and superconducting properties of Bi1.7Pb0.30Sr2Ca2−xLaxCu2Oy (Bi, Pb):2223 system with various x values (0.00 ≤ x ≤ 0.30) have been reported. It is found that the replacement of Ca2+ by La3+ up to 0.30 does not influence the phase purity of the pure system, while the orthorhombic distortion, excess oxygen, effective Cu valance and hole carriers/Cu ions are clearly affected. Further, the doping distance and crystal geometry factor are decreased, but the distance between neighboring Cu-atoms and density of excess doping are increased. Furthermore, the DTA diagrams show strong endothermic peaks Tm at 844.1, 848, 850.1 and 857.4 °C for pure and La samples, respectively. The mass loss determined by TGA displayed a sharp mass loss started at about 800 °C and extended to 1000 °C for all samples. Although the critical temperatures Tc of the samples are decreased by La insertion …

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