Pub Date : 2020-01-01DOI: 10.21608/egjg.2020.215750
Lotfy, M. M.
The aim of this work provides a better understand of the generation, migration, accumulation of hydrocarbons and multivariable processes that occur during the long basin history by the application of petroleum system modelling. Applying basin modelling makes it possible to evaluate the four dimensional controls on source, reservoir and seal rocks distribution, the master tectonic mechanism, as well as, source rock maturation, migration and trap formation. Petroleum potential therefore is influenced not only by the complex distribution of source, seal and reservoir rocks, but also by the effects of burial, uplift and erosion, which all undergo rapid variations in time and space. With the results of the 1-D basin modelling, a zone favorable for the generation of hydrocarbon from the proposed source rocks was defined based on the deposition and the thickness of the overburden rocks and the timing of the generation and migration of the generated and expelled amounts of petroleum. The evaluation of the results of vitrinite reflectance measurements for two wells in the studied basin was performed to obtain calibration data for 1-D basin modelling. In this context, the influence of temperature on organic matter had to be evaluated; maturity data also allowed calculating paleo-temperatures for the time of maximum burial or maximum temperatures. The result of the 1-D simulation shows the difference in burial, thermal and maturity history for the principle tectonic events.
{"title":"SOURCE ROCK EVALUATION AND BASIN MODELLING OF THE CRETACEOUS SUCCESSION AT QARUN AREA, NORTH WESTERN DESERT, EGYPT","authors":"Lotfy, M. M.","doi":"10.21608/egjg.2020.215750","DOIUrl":"https://doi.org/10.21608/egjg.2020.215750","url":null,"abstract":"The aim of this work provides a better understand of the generation, migration, accumulation of hydrocarbons and multivariable processes that occur during the long basin history by the application of petroleum system modelling. Applying basin modelling makes it possible to evaluate the four dimensional controls on source, reservoir and seal rocks distribution, the master tectonic mechanism, as well as, source rock maturation, migration and trap formation. Petroleum potential therefore is influenced not only by the complex distribution of source, seal and reservoir rocks, but also by the effects of burial, uplift and erosion, which all undergo rapid variations in time and space. With the results of the 1-D basin modelling, a zone favorable for the generation of hydrocarbon from the proposed source rocks was defined based on the deposition and the thickness of the overburden rocks and the timing of the generation and migration of the generated and expelled amounts of petroleum. The evaluation of the results of vitrinite reflectance measurements for two wells in the studied basin was performed to obtain calibration data for 1-D basin modelling. In this context, the influence of temperature on organic matter had to be evaluated; maturity data also allowed calculating paleo-temperatures for the time of maximum burial or maximum temperatures. The result of the 1-D simulation shows the difference in burial, thermal and maturity history for the principle tectonic events.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133792595","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}
Pub Date : 2020-01-01DOI: 10.21608/egjg.2020.216317
Imbarak, S. Hassan, R. Ahmad
The Gabal (G) Katherina complex in the southern Sinai of Egypt (Being a part of the ArabianShield) consisting mainly of volcanic arc granitoids, epiclastics and pyroclastic volcanic rocks (Rutiq volcanics), followed latterly by the emplacement of high-level intrusions (Katherina ring dyke) and calc-alkaline to slightly alkaline granites. The later-phase intrusions into the country rocks produced deferent degrees of contact aureole with significant alteration effects especially on the early-formed intermediate pyroclastics with their amygdules lava flows producing different degrees of zeolitization in the pyroclastic rocks, were investigated using Optical Microscopy, Scanning Electron Microscopy (SEM), X-ray diffraction (XRD) and wet chemical analyses. The studied volcanic rocks fall considerably in the basaltic andesite and rhyodacitedacite fields and show subcalcalkaline to calcalkaline affinities. On the other hand, the amygdaloidal volcanic rocks show low-temperature hydrothermal alteration characterized by the abundance of chloritization. Geochemically; Hf, Ta, Sr, Y, and Nb show slightly enrichment relative to the other zeolite-rich samples suggesting partial releasing of immobile elements from the volcanic rock during the alteration processes. Furthermore, zeolites found to fill the cavities in a non-uniform behavior. The subclass minerals such as phillipsite and chabazite have been accompanied by palagonite clasts, smectite, and calcite. Zeolites also occur in fibrous aggregates, partly or completely filling spheroid, ellipsoidal or irregular amygdules.
{"title":"ZEOLITE-BEARING AMYGDALOIDAL VOLCANIC AND VOLCANOCLASTIC ROCKS AT GABAL KATHERINE AREA, SOUTHERN SINAI, EGYPT","authors":"Imbarak, S. Hassan, R. Ahmad","doi":"10.21608/egjg.2020.216317","DOIUrl":"https://doi.org/10.21608/egjg.2020.216317","url":null,"abstract":"The Gabal (G) Katherina complex in the southern Sinai of Egypt (Being a part of the ArabianShield) consisting mainly of volcanic arc granitoids, epiclastics and pyroclastic volcanic rocks (Rutiq volcanics), followed latterly by the emplacement of high-level intrusions (Katherina ring dyke) and calc-alkaline to slightly alkaline granites. The later-phase intrusions into the country rocks produced deferent degrees of contact aureole with significant alteration effects especially on the early-formed intermediate pyroclastics with their amygdules lava flows producing different degrees of zeolitization in the pyroclastic rocks, were investigated using Optical Microscopy, Scanning Electron Microscopy (SEM), X-ray diffraction (XRD) and wet chemical analyses. The studied volcanic rocks fall considerably in the basaltic andesite and rhyodacitedacite fields and show subcalcalkaline to calcalkaline affinities. On the other hand, the amygdaloidal volcanic rocks show low-temperature hydrothermal alteration characterized by the abundance of chloritization. Geochemically; Hf, Ta, Sr, Y, and Nb show slightly enrichment relative to the other zeolite-rich samples suggesting partial releasing of immobile elements from the volcanic rock during the alteration processes. Furthermore, zeolites found to fill the cavities in a non-uniform behavior. The subclass minerals such as phillipsite and chabazite have been accompanied by palagonite clasts, smectite, and calcite. Zeolites also occur in fibrous aggregates, partly or completely filling spheroid, ellipsoidal or irregular amygdules.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132745126","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}
Pub Date : 2020-01-01DOI: 10.21608/egjg.2020.216316
Gaber
Nowadays, the calcium carbonate material is used on a wide scale as an effective dietary calcium supplement, antacid, phosphate binder, and base material for medicine tablets such as baking powder and toothpaste components. This study introduces a contribution and characterization of the Beni Khaled calcium carbonate for toothpaste pharmaceutical ingredients. Calcium carbonate samples were ground to very fine grain size ranging from 5 20 um to be used as an abrasive ingredient of toothpaste components by 25 55 % as per international standard. The testing techniques include measuring of physical, chemical and biological properties; XRF, XRD, water absorption, matter soluble in water, and biological study of harmful bacteria types which disappeared with the heating of CaCO3 powder up to 121oC.
{"title":"A NEW APPROACH OF EGYPTIAN CALCIUM CARBONATE UTILIZATION AS INGREDIENTS OF TOOTHPASTE MANUFACTURE","authors":"Gaber","doi":"10.21608/egjg.2020.216316","DOIUrl":"https://doi.org/10.21608/egjg.2020.216316","url":null,"abstract":"Nowadays, the calcium carbonate material is used on a wide scale as an effective dietary calcium supplement, antacid, phosphate binder, and base material for medicine tablets such as baking powder and toothpaste components. This study introduces a contribution and characterization of the Beni Khaled calcium carbonate for toothpaste pharmaceutical ingredients. Calcium carbonate samples were ground to very fine grain size ranging from 5 20 um to be used as an abrasive ingredient of toothpaste components by 25 55 % as per international standard. The testing techniques include measuring of physical, chemical and biological properties; XRF, XRD, water absorption, matter soluble in water, and biological study of harmful bacteria types which disappeared with the heating of CaCO3 powder up to 121oC.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"241 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133876957","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}
Pub Date : 2020-01-01DOI: 10.21608/egjg.2020.215758
El-Gameel, E. Desouky
Wadi El Ghuza area is located north of Safaga-Qena asphaltic Road and covers an area of about 450 km, dominated by different Late Neoproterozoic plutonic and volcanic complexes. The area comprises metavolcanics, serpentinites, metagabbros, older Granitoids, volcanosedimentary succession, felsitic intrusions, younger Granites, and post granitic dykes, respectively from the oldest to youngest rock units. Six consecutive sections were measured for the first time on the Wadi El Ghuza volcanosedimentary successions and exhibited stratigraphic intercalation between the Dokhan-type volcanics and the Hammamat sedimentary rocks. A new detailed geological map of the study area was prepared using remote sensing techniques and conventional and unconventional fieldwork. The false color composite 157 in RGB derived from ETM+ data and the composite 421 in RGB derived from ASTER principal component analysis technique discriminated and distinguished the lithology of different rock units in Wadi El Ghuza area. Geochemical studies of the Late Neoproterozoic units including the Dokhan volcanics and the Younger Granites indicate that they are high-K calc-alkaline affinity and were produced from A-type magmas in post-collisional settings. The studied A-type magma has been assumed to be generated by melting of crustal rocks of tonalite composition.
Wadi El Ghuza地区位于Safaga-Qena沥青公路以北，面积约450 km，以不同的晚新元古代深成岩和火山杂岩为主。区内岩石单元由最古老到最年轻依次为变火山岩、蛇纹岩、变长岩、较老花岗岩、火山-沉积演替、长英质侵入岩、较年轻花岗岩和后花岗岩岩脉。首次在Wadi El Ghuza火山-沉积序列上连续测量了6个剖面，显示了dokhan型火山岩与Hammamat沉积岩之间的地层插层作用。利用遥感技术和常规及非常规实地调查，绘制了研究区新的详细地质图。利用ETM+数据得到的RGB伪色组合157和ASTER主成分分析技术得到的RGB伪色组合421对瓦迪古扎地区不同岩石单元的岩性进行了区分。对晚新元古代多汗火山和更年轻花岗岩的地球化学研究表明，它们具有高钾钙碱性亲和性，产于碰撞后的a型岩浆中。所研究的a型岩浆被认为是由玄武岩组成的地壳岩石熔融产生的。
{"title":"PETROLOGICAL CHARACTERIZATION AND REMOTE SENSING-BASED MAPPING OF WADI EL GHUZA AREA, NORTH EASTERN DESERT, EGYPT","authors":"El-Gameel, E. Desouky","doi":"10.21608/egjg.2020.215758","DOIUrl":"https://doi.org/10.21608/egjg.2020.215758","url":null,"abstract":"Wadi El Ghuza area is located north of Safaga-Qena asphaltic Road and covers an area of about 450 km, dominated by different Late Neoproterozoic plutonic and volcanic complexes. The area comprises metavolcanics, serpentinites, metagabbros, older Granitoids, volcanosedimentary succession, felsitic intrusions, younger Granites, and post granitic dykes, respectively from the oldest to youngest rock units. Six consecutive sections were measured for the first time on the Wadi El Ghuza volcanosedimentary successions and exhibited stratigraphic intercalation between the Dokhan-type volcanics and the Hammamat sedimentary rocks. A new detailed geological map of the study area was prepared using remote sensing techniques and conventional and unconventional fieldwork. The false color composite 157 in RGB derived from ETM+ data and the composite 421 in RGB derived from ASTER principal component analysis technique discriminated and distinguished the lithology of different rock units in Wadi El Ghuza area. Geochemical studies of the Late Neoproterozoic units including the Dokhan volcanics and the Younger Granites indicate that they are high-K calc-alkaline affinity and were produced from A-type magmas in post-collisional settings. The studied A-type magma has been assumed to be generated by melting of crustal rocks of tonalite composition.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"434 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116184329","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}
Pub Date : 2020-01-01DOI: 10.21608/egjg.2020.215752
The present study aims to study the potentiality of promised radioactive zones in the granitic rocks at Gable Suwayqat area. The Processed Landsat ETM+ data false color composite image (FCC) band 7, 4, 2 in RGB, band ratios (5/7, 4/3, 3/1), (5/7, 5/1, 4), (3/1, 5/4,7/5) in red green blue and 5/7 in gray color. Principal component analysis (Pc2, Pc3, Pc5) in RGB were prepared for discriminating rock unites. Verified by the fieldwork and airborne gammaray spectrometric surveyed data enabled to differentiate the acidic and mafic rocks, and identified the alteration zones in the granitic rocks, which were effectively distinguished into high felsic and low ferromagnesian mineral contents, relative to the other granite areas. The gamma-ray spectrometric interpretations reveal that most of radiometric anomalies recorded at north eastern and south western sides of study area. The structural framework and consequent surface features controled and managed the distribution and localization of the radioactive elements and the environmental dose rates in the area. The high fractures density act as good channels and passages for the mineral bearing hydrothermal ascending fluids and the percolating meteoric water that leached uranium mineralization and redeposited it in the adjacent fractured sites. Such processes in the granitic masses may be responsible for the presence of uranium and thorium mineralizations in these granites. The calculated dose rates range between 0.1 and 1.1m Sv/year, indicating that the study area remains safe and under the maximum permissible safe radiation dose rate without harm to the individual, with continuous external irradiation of the whole body. The results show that the target area has some eU, eTh, and K% anomalies related to the biotite granites and are structurally controlled by the dominated faults.
{"title":"APPLICATION OF REMOTE SENSING AND AIRBORNE SPECTROMETRIC DATA ANALYSIS TO DELINEATE THE ALTERATION ZONES AT GABAL SUWAYQAT AREA CENTRAL EASTERN DESERT, EGYPT","authors":"","doi":"10.21608/egjg.2020.215752","DOIUrl":"https://doi.org/10.21608/egjg.2020.215752","url":null,"abstract":"The present study aims to study the potentiality of promised radioactive zones in the granitic rocks at Gable Suwayqat area. The Processed Landsat ETM+ data false color composite image (FCC) band 7, 4, 2 in RGB, band ratios (5/7, 4/3, 3/1), (5/7, 5/1, 4), (3/1, 5/4,7/5) in red green blue and 5/7 in gray color. Principal component analysis (Pc2, Pc3, Pc5) in RGB were prepared for discriminating rock unites. Verified by the fieldwork and airborne gammaray spectrometric surveyed data enabled to differentiate the acidic and mafic rocks, and identified the alteration zones in the granitic rocks, which were effectively distinguished into high felsic and low ferromagnesian mineral contents, relative to the other granite areas. The gamma-ray spectrometric interpretations reveal that most of radiometric anomalies recorded at north eastern and south western sides of study area. The structural framework and consequent surface features controled and managed the distribution and localization of the radioactive elements and the environmental dose rates in the area. The high fractures density act as good channels and passages for the mineral bearing hydrothermal ascending fluids and the percolating meteoric water that leached uranium mineralization and redeposited it in the adjacent fractured sites. Such processes in the granitic masses may be responsible for the presence of uranium and thorium mineralizations in these granites. The calculated dose rates range between 0.1 and 1.1m Sv/year, indicating that the study area remains safe and under the maximum permissible safe radiation dose rate without harm to the individual, with continuous external irradiation of the whole body. The results show that the target area has some eU, eTh, and K% anomalies related to the biotite granites and are structurally controlled by the dominated faults.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"386 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133166940","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}
Pub Date : 2020-01-01DOI: 10.21608/egjg.2020.215753
Kamel
The present study deals with geochemical, geotechnical and mineralogical studies of Lower Eocene carbonate rocks at El-QatamiyaAin Sukhna road and their suitability for road base and cement industries. The studied area lies between Latitudes 29o 37' 43ʹʹ and 29o 59 ' 45ʹʹ N. and longitudes 32o 20' 43ʹʹ and 32o 19' 48ʹʹ E. Lithologic studies of Lower Eocene (Ypresian) sediments are subdivided into two Formations in the G. Galala area from base to top: Galala Fm. and Minia Fm. were recorded. Physical properties studies of Lower Eocene carbonate rocks were made (at Arab Contractor Labs) on some raw materials (Limestone, Dolomite and Clay) detected in the studied area show their validity for road base constructions. The chemical composition major oxides were done using X-ray flourcense analysis on carbonate sections shows their suitability for cement industry. Silica modulus (S.M) factor, Alumina ratio (A.R) and Lime saturation factor (L.S.F) in Portland cement reveals that the studied carbonate sections (Galala area) raw materials are very suitable for cement industry.
{"title":"GEOTECHNICAL AND GEOCHEMICAL STUDIES ON CARBONATES AND THEIR SUITABILITY FOR ROAD BASES AND CEMENT INDUSTRIES, ELQATAMIYA- AIN SUKHNA ROAD, EGYPT","authors":"Kamel","doi":"10.21608/egjg.2020.215753","DOIUrl":"https://doi.org/10.21608/egjg.2020.215753","url":null,"abstract":"The present study deals with geochemical, geotechnical and mineralogical studies of Lower Eocene carbonate rocks at El-QatamiyaAin Sukhna road and their suitability for road base and cement industries. The studied area lies between Latitudes 29o 37' 43ʹʹ and 29o 59 ' 45ʹʹ N. and longitudes 32o 20' 43ʹʹ and 32o 19' 48ʹʹ E. Lithologic studies of Lower Eocene (Ypresian) sediments are subdivided into two Formations in the G. Galala area from base to top: Galala Fm. and Minia Fm. were recorded. Physical properties studies of Lower Eocene carbonate rocks were made (at Arab Contractor Labs) on some raw materials (Limestone, Dolomite and Clay) detected in the studied area show their validity for road base constructions. The chemical composition major oxides were done using X-ray flourcense analysis on carbonate sections shows their suitability for cement industry. Silica modulus (S.M) factor, Alumina ratio (A.R) and Lime saturation factor (L.S.F) in Portland cement reveals that the studied carbonate sections (Galala area) raw materials are very suitable for cement industry.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"216 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121149648","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}
Pub Date : 2020-01-01DOI: 10.21608/egjg.2020.215449
Mahmoud, Abouessa Ashour
Submarine channel complexes as in the Nile Delta province has complex geologic settings with a great degree of heterogeneity in reservoir properties, so this study will focus on the study of general geological setting in Simian field in Nile Delta, in addition to the study of the petrophysical, and sedimentological characteristics of the upper Pliocene reservoir rocks of Wastani formation in Simian field. Such studies are intended to improve the process of reserve estimation of the study area. The study includes calculation of petrophysical parameters for Simian reservoir rocks using advanced and conventional logging tools in the available wells to create lithology saturation cross plots and the lithologic identification cross plots ,clay minerals identification, introducing the lateral variation of the lithology and the different saturation distribution in the Pliocene reservoir and comparison of different petrophysical results to select the proper approach that can fit with channelized system to get accurate petrophysical parameters considering all the uncertainty related to reserve calculation to optimize the further development activity.
{"title":"AN INTEGRATED APPROACH FOR PETROPHYSICAL EVALUATION OF SHALY SAND RESERVOIRS IN SIMIAN FIELD, NILE DELTA,EGYPT","authors":"Mahmoud, Abouessa Ashour","doi":"10.21608/egjg.2020.215449","DOIUrl":"https://doi.org/10.21608/egjg.2020.215449","url":null,"abstract":"Submarine channel complexes as in the Nile Delta province has complex geologic settings with a great degree of heterogeneity in reservoir properties, so this study will focus on the study of general geological setting in Simian field in Nile Delta, in addition to the study of the petrophysical, and sedimentological characteristics of the upper Pliocene reservoir rocks of Wastani formation in Simian field. Such studies are intended to improve the process of reserve estimation of the study area. The study includes calculation of petrophysical parameters for Simian reservoir rocks using advanced and conventional logging tools in the available wells to create lithology saturation cross plots and the lithologic identification cross plots ,clay minerals identification, introducing the lateral variation of the lithology and the different saturation distribution in the Pliocene reservoir and comparison of different petrophysical results to select the proper approach that can fit with channelized system to get accurate petrophysical parameters considering all the uncertainty related to reserve calculation to optimize the further development activity.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116705555","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}
Pub Date : 2020-01-01DOI: 10.21608/egjg.2020.215761
Moustafa M. Mogahed
I-type granitoids emplaced during pre-collision stages of the Neoproterozoic Pan-African Orogeny, are widely distributed in the southern Sinai Peninsula and constituting 30% of the basement outcrops. Petrological, geochemical, and mineral chemistry data are presented for the I-type, Wadi El-Akhder granitic suite (AGR), in order to determine their origin and geotectonic implications. The tonalite– granodiorites of Wadi El-Akhder have geochemical characteristics of medium-K calc-alkaline, metaluminous to mildly peraluminous granitoids formed in an island-arc environment, which are conformable with well-known Egyptian older granitoids rocks (G1). They have low Al2O3, FeO*, MgO, MnO, CaO, TiO2, Sr, Ba, and V contents, but possess high contents of Na2O, K2O, Nb, Zr, Th, and Rb. The studied AGR are generally characterized by enrichment of LILE and LREE and depletion of HFSE relative to N-MORB values, and follow assimilation and fractional crystallization (AFC) trends indicative of extensive crustal contamination of magma derived from a mantle source. The studied granitic rocks show high CaO/Na2O ratios (0.82-1.54) being decrease from tonalite to granodiorites, whereas they have also high Al2O3/TiO2 ratios (16.69-27.61) increasing toward the granodiorites. These features indicate that emplacement of the granitoid were strongly affected by magma mixing of felsic and mafic melts. The chemical characteristics of the AGR are remarkably similar to those of subduction-related granitoids from the Arabian-Nubian Shield (ANS).
{"title":"GEOCHEMISTRY AND PETROGENESIS OF THE CALC-ALKALINE GRANITOIDS FROM THE NORTHERN ARABIAN–NUBIAN SHIELD. A CASE STUDY FROM WADI EL-AKHDER GRANITOIDS, SOUTHERN SINAI, EGYPT","authors":"Moustafa M. Mogahed","doi":"10.21608/egjg.2020.215761","DOIUrl":"https://doi.org/10.21608/egjg.2020.215761","url":null,"abstract":"I-type granitoids emplaced during pre-collision stages of the Neoproterozoic Pan-African Orogeny, are widely distributed in the southern Sinai Peninsula and constituting 30% of the basement outcrops. Petrological, geochemical, and mineral chemistry data are presented for the I-type, Wadi El-Akhder granitic suite (AGR), in order to determine their origin and geotectonic implications. The tonalite– granodiorites of Wadi El-Akhder have geochemical characteristics of medium-K calc-alkaline, metaluminous to mildly peraluminous granitoids formed in an island-arc environment, which are conformable with well-known Egyptian older granitoids rocks (G1). They have low Al2O3, FeO*, MgO, MnO, CaO, TiO2, Sr, Ba, and V contents, but possess high contents of Na2O, K2O, Nb, Zr, Th, and Rb. The studied AGR are generally characterized by enrichment of LILE and LREE and depletion of HFSE relative to N-MORB values, and follow assimilation and fractional crystallization (AFC) trends indicative of extensive crustal contamination of magma derived from a mantle source. The studied granitic rocks show high CaO/Na2O ratios (0.82-1.54) being decrease from tonalite to granodiorites, whereas they have also high Al2O3/TiO2 ratios (16.69-27.61) increasing toward the granodiorites. These features indicate that emplacement of the granitoid were strongly affected by magma mixing of felsic and mafic melts. The chemical characteristics of the AGR are remarkably similar to those of subduction-related granitoids from the Arabian-Nubian Shield (ANS).","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116578423","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}
Pub Date : 2020-01-01DOI: 10.21608/egjg.2020.215759
H. Khamees, El-Afandy, El-Tawapty
Wadi Sutrah-Umm Gheig area is located in the Central Eastern Desert, 20 km west of Marsa Alam international airport and 50 km south of the Quseir city. The area represents a part of the Arabian-Nubian Shield. It is also pertaining to the pan-African complex which consists of a folded belt of metasediments and metavolcanics subjected to greenschist-amphibolite facies metamorphism associated with partial melting of amphibolites and development of gneissic and migmatitic rocks. The rocks of the metasediments are tectonically enclosed sheets and lenses of serpentinites, forming an ophiolitic mélange. These rock units intruded by four granitoid groups related to different magmatic and tectonic events. The area was affected by three distinct deformational events (D1–D3). D1 interpreted to have resulted from the closure of inter-arc basins, ophiolite obduction, and collision of East and West Gondwana, representing the earliest phase of deformation in the area. In the area of Umm Ghamis, D1 represented by a series of tight overturned folds which have a NW-SE strike with NE and SW dip directions. During D2 transpression, which marked the terminal stages of the Pan-African Orogeny, along Wadi Sutrah a series of open folds with NW–SE trending axes that plunge mostly to the SE. D3 deformation is thought to be belongs to the regional Najd system, represented by several prominent shear zones and strike-slip faults. The F3 phase folds are trending nearly E-W discordant to the other older two phases F1 and F2.
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Pub Date : 2020-01-01DOI: 10.21608/egjg.2022.214850
El-Kharboutly
Sitra-8 Field which located in the northern Western Desert of Egypt is famous with its multi-reservoir zones. The real problem in this field is the hydrocarbon migration which cause in turn that some of the wells in the area became water bearing or even dry. The integration between the structural elements deducted from the 3D seismic analysis and the litho-facies core data, as well as well logging interpretation, gave a clear vision about the water bearing reservoirs (Salama et al., 2017). The present study proposes a significant integration between the subsurface geologic information, the interpreted 3D seismic data and the well logging data, for the purpose of delineating the major effective subsurface structures, as well as the reservoir evaluation at Sitra-8 Field area in the northern Western Desert of Egypt. This can be more helpful in any upcoming appraisal process in the future, which in turn will be reflected on the field development economically. The study area lies between latitudes 29° 44' 41'' & 29° 48' 00'' N and longitudes 27° 56' 27'' & 28° 00' 00'' E. It covers an area about 35 km2. The authors in the current study tracked Abu Roash-C Member reservoir for the same problem and tried to introduce a suitable tool for addressing the hydrocarbon leaking problem. The study was a worthy challenge to find new promising areas; when it comes to the hydrocarbon exploration or development. The authors based on analyzing the petroleum system of the investigated area are recommending future drilling for development in the northeastern part of that area.
Sitra-8油田位于埃及西部沙漠北部，以其多储层而闻名。该领域的真正问题是油气运移，这反过来又导致该地区的一些井含水甚至干涸。从三维地震分析中推断出的构造元素与岩相岩心数据以及测井解释之间的整合，为含水油藏提供了清晰的视角(Salama et al.， 2017)。本研究提出将地下地质信息、三维地震解释数据和测井数据进行整合，以圈定埃及西部沙漠北部Sitra-8油田的主要有效地下构造，并进行储层评价。这在未来的任何评估过程中都会更有帮助，这反过来又会反映在油田开发的经济上。研究区位于北纬29°44′41”& 29°48′00”，东经27°56′27”& 28°00′00”之间，面积约35 km2。在当前的研究中，作者追踪了Abu Roash-C成员油藏的相同问题，并试图引入一种合适的工具来解决油气泄漏问题。这项研究是一个有价值的挑战，可以找到新的有前途的领域;当涉及到油气勘探或开发时。在对调查区含油气系统进行分析的基础上，对该区东北部今后的钻探开发提出了建议。
{"title":"3D SEISMIC INTERPRETATION AND STRUCTURAL ANALYSIS OF SITRA-8 FIELD IN ABU GHARADIG BASIN, NORTHERN WESTERN DESERT, EGYPT","authors":"El-Kharboutly","doi":"10.21608/egjg.2022.214850","DOIUrl":"https://doi.org/10.21608/egjg.2022.214850","url":null,"abstract":"Sitra-8 Field which located in the northern Western Desert of Egypt is famous with its multi-reservoir zones. The real problem in this field is the hydrocarbon migration which cause in turn that some of the wells in the area became water bearing or even dry. The integration between the structural elements deducted from the 3D seismic analysis and the litho-facies core data, as well as well logging interpretation, gave a clear vision about the water bearing reservoirs (Salama et al., 2017). The present study proposes a significant integration between the subsurface geologic information, the interpreted 3D seismic data and the well logging data, for the purpose of delineating the major effective subsurface structures, as well as the reservoir evaluation at Sitra-8 Field area in the northern Western Desert of Egypt. This can be more helpful in any upcoming appraisal process in the future, which in turn will be reflected on the field development economically. The study area lies between latitudes 29° 44' 41'' & 29° 48' 00'' N and longitudes 27° 56' 27'' & 28° 00' 00'' E. It covers an area about 35 km2. The authors in the current study tracked Abu Roash-C Member reservoir for the same problem and tried to introduce a suitable tool for addressing the hydrocarbon leaking problem. The study was a worthy challenge to find new promising areas; when it comes to the hydrocarbon exploration or development. The authors based on analyzing the petroleum system of the investigated area are recommending future drilling for development in the northeastern part of that area.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126372149","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}
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