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161.
Osama M. K. Kassem Abdel Aziz M. Al Bassam Faisal K. Zaidi 《Geology of Ore Deposits》2013,55(6):482-493
The present study focuses on the gold mining in Mahd Ad Dahab region of Saudi Arabia. The study aims to assess the spatial relationship between tectonic contacts in Mahd Ad Dahab area and to provide a meaningful hypothesis relating gold metallogeny to the evolution of the Arabian Shield. Distribution and localization of gold occurrences in the study area was envisaged based on the different styles of microstructures and the major deformation phases affecting the area. The detailed petrographical and mineralogical investigations indicate that the metavolcanic rocks at the Mahd Ad Dahab gold mine area can be classified into metabasalt, metaandesite, and the felsic varieties (metadacite, metarhyodacite and metarhyolite) associating their metapyroclastics (conglomerate and tuffs). Furthermore, quartz forms allotriomorphic crystals which exhibit wavy extinction, deformational lamina and foliation due to subsequent deformations. Furthermore, we conclude that finite strain in the deformed rocks is of the same order of magnitude for all units of metavolcano-sedimentary rocks. Furthermore, contacts formed during intrusion of plutons with some faults in the Mahd Ad Dahab area under brittle to semi-ductile deformation conditions. In this case, finite strain accumulated during superimposed deformation on the already assembled nappe structure. It indicates that the contacts formed during the accumulation of finite strain. 相似文献
162.
Closed basins such as the Caspian Sea rapidly respond to variations in atmospheric and geological events. This study has been
conducted to deduce the role of natural and anthropogenic influences on the Caspian Sea mean water level fluctuations for
the period of 1998–2005. It is recognized that climate is the primary mechanism of the Caspian Sea mean water level variations
based on the relatively small differences of the Caspian Sea hydrologic budget residuals and the Caspian Sea mean water level
fluctuations. This is further supported by the similarity in water-level variations of the Caspian Sea with those of Lake
Van and Lake Urmia. On the other hand, the Caspian Sea needed to lose some of its water to attain water balance equilibrium
in 2000 and 2001. The year 2000 showed anomalous seismic activity particularly in the southwestern part of the Caspian Sea.
Two significant earthquakes with magnitudes of 6.8 and 6.5 Mw occurred on November 25, 2000. The focal mechanisms of these earthquakes and numerous aftershocks indicated normal faulting
and, therefore, caused the Caspian Sea lake level to decline in 2000. The contribution of submarine mud volcano eruptions
to the Caspian Sea lake level could be insignificant based on the comparison of water budget residuals and the mean water
level variations. Neither crustal deformation (based on the GPS measurements) nor the offshore oil and natural gas production
activities in the Caspian Sea are responsible for noticeable changes to the level of the Caspian Sea. 相似文献
163.
164.
Tailai Wen Marco R. Thiele David Echeverría Ciaurri Khalid Aziz Yinyu Ye 《Computational Geosciences》2014,18(3-4):483-504
Waterflooding is a common secondary oil recovery process. Performance of waterfloods in mature fields with a significant number of wells can be improved with minimal infrastructure investment by optimizing injection/production rates of individual wells. However, a major bottleneck in the optimization framework is the large number of reservoir flow simulations often required. In this work, we propose a new method based on streamline-derived information that significantly reduces these computational costs in addition to making use of the computational efficiency of streamline simulation itself. We seek to maximize the long-term net present value of a waterflood by determining optimal individual well rates, given an expected albeit uncertain oil price and a total fluid injection volume. We approach the optimization problem by decomposing it into two stages which can be implemented in a computationally efficient manner. We show that the two-stage streamline-based optimization approach can be an effective technique when applied to reservoirs with a large number of wells in need of an efficient waterflooding strategy over a 5 to 15-year period. 相似文献
165.
Ezzadin N. Baban Bakhtiar Q. Aziz Nawzad H. Aziz 《Arabian Journal of Geosciences》2014,7(6):2279-2291
The study is carried out to detect the subsurface structures that have geological and economic importance by interpreting the available seismic reflection data of an area estimated to be about 1,752 km2. The study comprises of the Kalar–Khanaqin and surrounding area, which is located at Zagros folded zone. Twenty-five seismic sections had been interpreted. The total length of all the seismic lines is about 650.4 km. Interpretation of the seismic data is focused on two reflectors, lower Fars and Jeribe formation. The lower Fars reflector picked at the two-way time ranging from 0.1 to 2.6 second, while the Jeribe reflector picked at the two-way time ranging from 1.0 to 2.7 second. The constructed maps denote to the existence of many closed and nose structures, in addition, to numerous fault types. All these features were detected in the area having the NW–SE trend. The depth of the lower Fars formation is ranging from 100.0 to 4,800.0 m, while the depth of the Jeribe formation is ranging from 1,700.0 to 5,000.0 m. The depth maps for the two formations also refer to the similarity of the major geological structures. These structures appear in both formations with existence of slight variation in dimensions. The closed structure no. (1) is located at the north of the study area. The nose structure no. (2) is located at the south of the area. At the west of the area, the elongated structure no. (3). The longitudinal reveres fault intersects the SW limb of the structure. The SW limb of elongated structure no. (4), intersect by longitudinal reveres fault, is located at the east of the area. There is also the semi-closed structure no. (5), which appears at the west of the area around the Qr-1 well. Most of detected faults are of reverse and thrust types having a variable amount of throws and horizontal displacements. Some seismic sections explained the existence of the decollement surface within lower Fars formation, which caused the thrusting and faulting of the overlaying beds. 相似文献
166.
The black shale samples collected from two Neogene formations in the Klias Peninsula area, West Sabah, have been assessed
and characterized in details by gas chromatography, gas chromatography-mass spectrometry and a variety of organic geochemical
parameters. The aims of this study are to describe the characteristics of organic matter of these sediments in terms of source/type
of the organic matter, assess its thermal maturity and paleoenvironment of deposition, based primarily on biomarker distributions.
The results of both formations do not reveal significant differences within the rock extracts. The gas chromatograms of the
saturated hydrocarbon fractions of the Setap Shale and the Belait formations displayed monomodal n-alkane distributions and
nearly identical regular sterane compositions with a predominance of C27 regular steranes. These are consistent with open marine depositional environments dominated by marine biological matter.
Another related feature of these rock extracts is the presence of a high relative abundance of gammacerane, indicating anoxic
marine hypersaline source depositional environment. The relatively high abundance of common land plant-derived biomarkers,
such as bicadinanes and oleananes, is a clear indication of a major terrigenous input to the source of the extractable organic
matter. The predominance of oleanane biomarkers in both formations is indicative of angiospermis input and Tertiary source
rocks. The high C29/C30 hopane ratios, moderate development of C33–C35 hopanes, high abundance of tricyclic terpanes and a slight predominance of C27 regular sterane over C28 and C29 steranes are characteristic features tending to suggest a significant marine influence on these source rocks, thereby suggesting
a mixed source input. The 22S/(22S+22R)C32 hopane ratio has reached equilibrium, and this is supported by the high maturity level as indicated by the 22S/22SC31–33 extended hopane ratios and 20S/(20S+20R)C29 regular steranes ratios. 相似文献
167.
Detailed geophysical measurements have been carried out in the northwestern part of the Sinai Peninsula. This area was mainly used by the ancient Egyptian army forces to support the trading and mining trips to Sinai and Asia. The geophysical field work aimed to discover new buried archeological remains using the efficient archeogeophysical detailed and nondestructive methods including total magnetic field, vertical magnetic gradient, and very-low-frequency electromagnetic measurements. Results of the field geophysical measurements have led to a discovery of a temple which is located on the Horus military road. This discovery has been verified by an excavation program, under the supervision of the Supreme Council of Egyptian Antiquities, where buried remains of a pharaoh’s temple were detected and photographed. Some other sites were recommended for further excavation in the future. 相似文献
168.
An analytical method is developed to provide a better understanding of bolt shearing across joint planes under lateral confinement.
The study was undertaken in conjunction with a laboratory study of the double shearing of bolts in concrete. A review of various
analytical methods is discussed, and the bending behaviour of the bolts is studied under both elastic and plastic conditions.
Issues examined include; hinge point location, the effect of concrete strength on the bolt-bending behaviour; the influence
of bolt axial loading and bolt diameter on the hinge point position with respect to sheared joint planes. It was found that
the applied axial load on the bolt had a significant bearing on the location of the hinge points in different strength concrete,
particularly at low strengths. The hinge point location is also influenced by the bolt diameter. 相似文献
169.
Mohammed Lami Abdel Karim Nouaman Kassem Osama Mohamed Kaoud Al Bassam Abdel Aziz Mohamed 《Arabian Journal of Geosciences》2020,13(6):1-6
Arabian Journal of Geosciences - In this work, quantitative analysis of coastal zone landform morphology is carried out through the integration of landscape index, remote sensing (RS) and... 相似文献
170.
Zeit Bay Field is one of the most important oil-bearing fields in the Gulf of Suez, Egypt, producing oil from the fractured basement rocks. Due to the complex structural setting of the area and the classical exploration concept that was based mainly on 2D seismic survey data, the area suffered from limited hydrocarbon interest for several years. During this time, most of the drilled wells hit structural highs and resulted in several dry holes. The present study is based on the interpretation of more recently acquired 3D seismic survey data as, matched with the available well logs, used to understand the complex structural setting of the Zeit Bay Field and provide insight into the entrapment style of the implied hydrocarbons. Several selected seismic cross sections were constructed, to extract subsurface geologic information, using available seismic profiles and wells. In addition, structure contour maps (isochronous maps, converted to depth maps) were constructed for the peaks of the basement, Nubian Sandstone, Kareem and Belayim Formations. Folds (anticlines and synclines) and faults (dip-slip) are identified on these maps, both individually and in groups, giving rise to step-like belts, as well as graben and horst blocks. 相似文献