Egyptian Journal of Geology最新文献

{"title":"The Impact of Seasonal Weather Changes on the Accumulated Sediments within Back-Reef Environment around Umm Al-Maradim island- Kuwait","authors":"A. Al-Langawi","doi":"10.21608/egjg.2023.176984.1030","DOIUrl":"https://doi.org/10.21608/egjg.2023.176984.1030","url":null,"abstract":"","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"220 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130653302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogeochemical processes and groundwater quality assessment of the Nubian Sandstone Aquifer System in El Farafra Oasis, Egypt","authors":"H. A. Abu Salem, M. El-Ghamrawy, Ali Ali Khalil","doi":"10.21608/egjg.2022.119484.1016","DOIUrl":"https://doi.org/10.21608/egjg.2022.119484.1016","url":null,"abstract":"","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126011881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reservoir Characterization of the Upper Cretaceous Abu Roash and Bahariya Reservoirs, Main Abu El-Gharadig Oil Field, North Western Desert, Egypt","authors":"N. El-Gendy, M. Noweir, Mohamed S. El-Sadek, A. Ali","doi":"10.21608/egjg.2022.139760.1020","DOIUrl":"https://doi.org/10.21608/egjg.2022.139760.1020","url":null,"abstract":"T HE study area is located in Abu El-Gharadig basin, between 29° 40’ and 29° 45’ N latitudes and 28° 25’ and 28° 32’ E longitudes. The study aims to evaluate four formations that are located in the middle part of Abu El-Gharadig Basin, North Western Desert, Egypt. This is carried out by conducting petrophysical analysis, to investigate the late Cretaceous hydrocarbon-bearing reservoirs of the Abu Roash “D” and “E” Members, and the Bahariya Formations. To achieve the aim, Interactive Petrophysics software (IP) version 3.5 helped in well-logging evaluation providing the density-neutron and the M-N cross_plot, to characterize the porosity and lithology of the reservoirs and the effect of shale and secondary porosity on the potentials of these reservoirs. In addition, the software presents analogs indicating the vertical distribution of petrophysical parameters for the studied well and to show the distribution of shale volume, porosity, water saturation and hydrocarbon saturation and identify the oil-bearing zones. Analysis of the petrophysical parameters report that, the Abu Roash “D” reservoir is mostly limestone with sandstone and shale lithology, while the Abu Roash “E” reservoir is primarily sandstone, with shale, limestone and dolomite lithology. The reservoirs in the Upper and Lower Bahariya are mostly sandstones, with argillaceous and calcareous types of cement. The shale volumes in the Abu Roash ( D and E ) Members and Upper and Lower Bahariya Formation are 0.9 – 3.8 %, 8.2 – 13.7, 7.2 – 15.2, and 9 – 15.5 %, respectively, and the effective porosities are 6.7 – 14.7 %, 13.9 – 18.1 %, 13.1 – 15.5 % and 11.4 – 15.5 %, expressing a good reservoir quality of the zones. Petrophysical data from the Abu Roash and Bahariya reservoirs are shown on analogs, to identify the most effective thicknesses with good hydrocarbon potential.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"37 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116342477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural and stratigraphic controls on the geothermal regime of the Gulf of Suez, Egypt as revealed by the geophysical and bottom-hole temperature data","authors":"H. Alrefaee","doi":"10.21608/egjg.2023.177487.1031","DOIUrl":"https://doi.org/10.21608/egjg.2023.177487.1031","url":null,"abstract":"","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128174150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Utilization of Remote Sensing data in the mapping of the Cretaceous-Quaternary rocks, El Fayum-Greater Cairo region (south El Kattaniya high), Egypt","authors":"A. Abuzied, Ali Abdallah, A. Farrag","doi":"10.21608/egjg.2022.164071.1023","DOIUrl":"https://doi.org/10.21608/egjg.2022.164071.1023","url":null,"abstract":"*Corresponding author: nasserabuzied@yahoo.com Received: 20/09/2022; Accepted: 18/10/2022; DOI: 10.21608/EGJG.2022.164071.1023 ©2022 National Information and Documentation Center (NIDOC) O the last few years, remote sensing techniques have become an indispensable in Earth science, especially in geological investigation. El Fayum-Greater Cairo region is characterized by strong diversity in the rocks lithologies (Upper Cretaceous-Quaternary units) and the affecting structures, as well as the agricultural activities at both sides of the Nile River in the Nile Valley and tow water lakes. These geologic diversities encourage us selecting this region to applying the PCA and ICA techniques for the Landsat 8 OLI and Sentinel-2A imagery data. These two applications are used to define the ratio combinations for each sedimentary lithologic facies and mixed facies, basaltic flows, agricultural systems, and water bodies of different salinity. Several geologic factors are determined controlling the quality appearances on the processed images, which are the lithologic homogeneity, percent of each lithology in the mixed facies, rock unit thickness, outcrop width, weathering intensity, surficial sediment covers, which part of the unit is exposed, and topographic occurrence of the unit. Three orders of qualities are suggested for the band combination ratios that used in the separation of limestone, limestone mixed facies, sand-sandstone, sandstone mixed facies, basaltic flows, clastic and carbonate mixed facies, agricultural cover, water bodies (Qarun and Wadi Rayan lakes and Nile River). These combination ratios are controlled by the lithologic homogeneity, percents of lithologies in the mixed facies, rock unit thickness, outcrop width, weathering intensity, surficial sediment covers, which part of the unit is exposed, and topographic setting of the unit. The Upper Eocene sandstone and claystone mixed facies are well represented on the ICA images rather than those on the PCA. The whole basaltic flows in the study area are discriminated well on most images whereas the large (thick) flow parts are separated only on the PCAL (6/5/3RGB) and ICAs (7/2/11RGB). The east-west faults that offseted the basaltic sheets are clearly mapped on the PCAL3/1/2RGB, ICAL3/1/2RGB, and ICAL4/7/3 images, as well as they are mapped on the ICAs11/2/12RGB and ICAs3/11/5RGB.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127136885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Field Features, Mineral assemblages and Geochemistry of Radioactive Pegmatite in the Wadi Abu Zawal Area, North Eastern Desert, Egypt","authors":"Amr Abdel Hamid, Hicham Abdel Hamid","doi":"10.21608/egjg.2021.98782.1004","DOIUrl":"https://doi.org/10.21608/egjg.2021.98782.1004","url":null,"abstract":"Many geologists are increasingly paying attention to granitic pegmatites since they are important sources of rare metals (London, 2008). Rare-element pegmatites are classified into LCT (rich in Li, Cs, and Ta), NYF (rich in Nb, Y and F), and mixed petrogenetic families (Ĉerny and Ecrit 2005). LCT family is suggested to be associated usually with Ior S-type granite derived from a sedimentary source in a lateor post-orogenic setting. The NYF family is suggested to be associated with A-type granite derived from a mixed source of lower crust. GRANITIC pegmatites of the Wadi Abu Zawal area, North Eastern Desert of Egypt, intruded the syn-tectonic granites, younger gabbros and post-orogenic granites. Two unzoned pegmatite masses are quarried for feldspars and quartz, which injected within the older granites. One of them shows high radioactivity related to formation of U-ThREEs mineralization. The mineralization occurs at the margins of this pegmatite body in close proximity to contacts with the host older granite. Hydrothermal hematite, kaolinite and epidote are dominant along the contact zone. Petrographic observations showed that the mineralized parts are mainly albite-rich with minor quartz and muscovite. The hydrothermal mineral assemblage contains secondary uranium minerals (uranophane and kasolite), uranothorite and monazite-Ce. The mineralization occurs as stains or crystallizes in the microsfractures of the pegmatite. Whole-rock analytical data of albite-rich samples display high contents of Na2O, CaO and Al2O3 with significant lower concentrations of SiO2 and K2O. The analyzed samples are enriched with U, Th, REEs, Zn, Pb, Sr and Ba. Detailed field, mineralogical and geochemical data have provided evidence that the investigated pegmatite has similar characters to other fractionated NYF-type pegmatites in the North Eastern Desert of Egypt.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115820558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Low-Grade Bentonite Modification on Mechanical, Thermal and Electrical Properties of PVC/Clay Nanocomposites for Electrical Applications","authors":"M. Ragab, M. El-Shafeiy, A. Abdel-Motelib, K. El-Ashry","doi":"10.21608/egjg.2021.103811.1012","DOIUrl":"https://doi.org/10.21608/egjg.2021.103811.1012","url":null,"abstract":"Correponding author: Ragab, Mohamed, Email: mohamedm.ragab@yahoo.com Received: 01/11/2021; Accepted: 19/12/2021 DOI: 10.21608/egjg.2021.103811.1012 ©2021 National Information and Documentation Center (NIDOC) THE main aim of this research is to investigate the suitability of using a low-grade bentonite in poly vinyl chloride (PVC)/clay nanocomposites for electrical applications. Bentonite was modified using Benzalkonium Chloride (BAC) as cationic surfactant, then both raw and modified bentonite (RB and MB) were introduced as fillers in mixture with PVC resin, plasticizer and stabilizer to produce PVC insulation compound for cables manufacturing. X-ray diffraction (XRD) and X-ray fluorescence (XRF) analysis were carried out to investigate the mineralogical and chemical composition of bentonite sample. Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and contact angle (CA) tests were performed on PVC insulation compound to investigate the interaction and compatibility between bentonite and PVC. Further investigations were established to characterize mechanical, thermal, and electrical properties of PVC compounds. The bentonite sample results show that bentonite is of low-grade bentonite. PVC/ clay insulation compounds results show that compatibility between PVC and bentonite increases in case of using modified bentonite (MB), therefore, the hydrophobicity of resulted PVC compound increased. Moreover, PVC/ MB nanocomposites show better mechanical properties (such as tensile strength and elongation at break) than PVC/ raw bentonite (RB) nanocomposites;the tensile strength values have increased from 21.1, 20, 19.1, and 18.2 N/mm2 for 2.5, 5, 7.5, and 10 phr of RB, respectively, for PVC/RB nanocomposite samples to 22.4, 21.3, 20.5, and 20 N/mm2 for the corresponding PVC/MB nanocomposites, On contrast, PVC/ RB nanocomposites give significantly better thermal properties (thermal stability) and electrical properties; the volume resistivity were decreased from 1.071012 for PVC/RB nanocomposites 10 phr of RB for to 5.86×1010 Ω∙cm for the corresponding PVC/MB nanocomposite.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"509 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123200908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogeological Characteristics of the North Eastern Part of El Farafra Oasis, Western Desert, Egypt","authors":"M. El-Ghamrawy, Ali W. Ali, Akram Fikry, H. A. Abu Salem","doi":"10.21608/egjg.2021.99109.1007","DOIUrl":"https://doi.org/10.21608/egjg.2021.99109.1007","url":null,"abstract":"Corresponding author: El-Ghamrawy, Mohamed Magdy, Email: mohamed.mmg191@gmail.com Received: 06/10/2021; Accepted: 31/10/2021 DOI: 10.21608/egjg.2021.99109.1007 ©2021 National Information and Documentation Center (NIDOC) THE EGYPTIAN Western Desert is considered as one of the most arid regions in the country. Recently, expanding developmental activities are invading the study area in El Farafra Oasis especially agriculture. The groundwater in the Western Desert represents the main source of water where the increase in groundwater extraction rates could affect the future development plans negatively. Accordingly, this article is concerned with the study of the hydrogeological characteristics of the Nubian Sandstone Aquifer System (NSAS) and the effect of groundwater exploitation on aquifer potentiality. The study includes well inventory, measuring piezometric heads, measuring salinity of groundwater samples as well as conducting and analysing of pumping/ recovery tests on selected wells. Two hydrogeological cross sections were constructed based on the data of new drilled wells. The regional groundwater flow direction in the NSAS is from southwest to northeast. However, local groundwater flow from east to west is evidenced due to extensive groundwater extraction in the west. The analyses of pumping tests were carried out to estimate the hydraulic properties such as the hydraulic conductivity (K), the transmissivity (T) and the storativity (S). The average K is about 7.1 m/d, while the average T is about 2704 m2/d. The storativity reached about 0.0002. The potentiality of the NSAS varies from high potential in the middle and the eastern parts, to moderate potential in the western parts. A groundwater development plan is recommended to avoid the deterioration of the NSAS in the coming decades.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116503145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphotectonic Evolution of Qaret El Sheikh Abdallah Depressions and Denuded Paleo-Karst in the White Desert, El Bahariya-Farafra Karst Territory, Egypt.","authors":"M. El-Aref, Ahmed Salama, M. Hammed","doi":"10.21608/egjg.2021.103324.1011","DOIUrl":"https://doi.org/10.21608/egjg.2021.103324.1011","url":null,"abstract":"Corresponding author: Hammed, Mohamed Saleh Hassan, Email: salehhammed@cu.edu.eg Received 27/10/2021; Accepted 07/11/2021 DOI: 10.21608/egjg.2021.103324.1011 ©2021 National Information and Documentation Center (NIDOC) THE Late Cretaceous-Early Eocene carbonate sequences of the White Desert of Egypt exhibit amazing complex paleo-humid karst landforms, so it was declared as a nature-protected area since 2002. Two karst depressions of El Sheikh Abdallah and the Crystal Mountain (Qaret El Sheikh Abdallah) are identified by detailed fieldwork and GIS morphometric analysis of the digital elevation model of the northern part of the White Desert. These depressions are verified as two separate karst uvalas between the major karst poljes of El Bahariya and Farafra karst territory with northeast alignment. The sea-level drops and uplifting phases of the carbonate sequences of the uvalas, associated with the major compressional events of the Syrian arc (Cretaceous-Paleogene) and Oligo-Miocene extensional tectonics in north Egypt caused the development of three major stratigraphic breaks (fossilized paleo-karst surfaces) of Late Cretaceous-Palaeocene, Palaeocene-Early Eocene, and post-Early Eocene (Oligocene-Miocene). Along these fossilized surfaces, paleokarst features and sediments are detected and described. El Sheikh Abdallah and the Crystal Mountain depressions (uvalas) are also dominated by exposed (surface) complex karst features such as unroofed caves, widened joints, sinkholes, collapse breccia’s, and solution channels, together with sporadic remains of uncovered autochthonous and allochthones paleo-cave sediments. The recognized stratigraphic breaks and their paleokarst features and the subsequent surface denudation helped to propose a morphotectonic evolutionary model for the exposed karst landscape and the denuded karst features of El Sheikh Abdallah-Crystal Mountain uvalas.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115390556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison between the Structurally Controlled Radioactive Minerals at Felsic Granites of G. Abu Harba, G. Dara and G. Hamrat Al Jirjab Areas, Northern Eastern Desert, Egypt","authors":"Joseph Samaan, Anton G. Waheeb","doi":"10.21608/egjg.2021.96233.1003","DOIUrl":"https://doi.org/10.21608/egjg.2021.96233.1003","url":null,"abstract":"The radioactive minerals occurrence at G.Abu Harba area and G. Dara area are recorded along normal fault zone or shear zone trending in the same direction (N15oW) with same dips of about 86o. The gamma radioactivity measured over these anomalies ranges between 1800 ppm to 2400 ppm; while the occurrence of the radioactive mineral at G. Hamrat Al Jirjab is along sinistral strike slip fault trending N50°W with a dip equal 70° to NE. The gamma radioactivity reaches 2200 ppm.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123100779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}