Pub Date : 2020-01-01DOI: 10.1080/20909977.2020.1719341
M. Gomaa
ABSTRACT Electrical features of a humid kaolinite specimens was measured at various pressures and at various frequencies . Surface impedance is supposed on kaolinite particle surfaces (from humidity), chemical reaction and charge transport along surface hydroxyls of kaolinite edges besides the permanent negative charges. Classic mixture laws do not support the interpretation of electrical properties, especially, at high pressures. Accordingly, interpretation was made with percolation threshold theories. Pressure increase causes decrease in pore spaces and accordingly increases possible connections of pore distances filled with humidity to total pore spaces after applying pressure. With pressure increase, the pore voids between particles decrease and water conducting paths increase. Also, dielectric constant and conductance increase with increase of pressure. On the other hand, at a certain pressure, at low frequencies, a noticeable increase of capacitance with pressure increase, that tends to reach constant value, for relatively high pressures. The diffusion and interfacial mechanisms was suggested to interpret samples with increase of pressure and frequency. The latter mechanism acts simultaneously with surface chemical reaction mechanism (Debye behavior) to give a depressed arc (relaxation time distribution). Finally, the pressure and frequency are effective factors on electrical properties.
{"title":"Kaolinite under pressure at audio frequency range and its electrical features","authors":"M. Gomaa","doi":"10.1080/20909977.2020.1719341","DOIUrl":"https://doi.org/10.1080/20909977.2020.1719341","url":null,"abstract":"ABSTRACT Electrical features of a humid kaolinite specimens was measured at various pressures and at various frequencies . Surface impedance is supposed on kaolinite particle surfaces (from humidity), chemical reaction and charge transport along surface hydroxyls of kaolinite edges besides the permanent negative charges. Classic mixture laws do not support the interpretation of electrical properties, especially, at high pressures. Accordingly, interpretation was made with percolation threshold theories. Pressure increase causes decrease in pore spaces and accordingly increases possible connections of pore distances filled with humidity to total pore spaces after applying pressure. With pressure increase, the pore voids between particles decrease and water conducting paths increase. Also, dielectric constant and conductance increase with increase of pressure. On the other hand, at a certain pressure, at low frequencies, a noticeable increase of capacitance with pressure increase, that tends to reach constant value, for relatively high pressures. The diffusion and interfacial mechanisms was suggested to interpret samples with increase of pressure and frequency. The latter mechanism acts simultaneously with surface chemical reaction mechanism (Debye behavior) to give a depressed arc (relaxation time distribution). Finally, the pressure and frequency are effective factors on electrical properties.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"42 1","pages":"176 - 189"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83111384","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: 10.1080/20909977.2020.1803661
E. Fergany, K. Omar, Gad-El-Kareem A. Mohammed
ABSTRACT On 3 September 2015, an unexpected earthquake with magnitude MB = 4.5 occurred in a completely silent area, located at 40 km south El Alamein city north western desert, where there are ~ 20 million pieces of unexploded ordnance. This study aims to: i) review and interpret the widespread seismic activity in Egypt during the last three decades, and ii) delineate the active seismic source zones map of Egypt based on realistic assumptions. These assumptions include only the real and accurate seismic events from the whole earthquake catalogue of Egypt. The idea based on the accuracy of the monitoring system, magnitude size of earthquakes, and detailed structure elements map of Egypt. The seismic catalogue of Egypt was updating to the end of 2019 including the historical and instrumental earthquakes since −2200 BC. The seismicity map of Egypt was outlined along five interval periods based on the significant evolution in the seismic monitoring system. The advanced monitoring period in the detection and location of seismic events in entire Egypt was supposed to begin in 2003 where the ENSN almost accomplished. Seismicity of advanced monitoring period 2003–2019 can be used as a tracer of real seismicity boundaries entire Egypt. Active seismic source zones map was delineated based on the advanced monitoring period and the unified Mw ≥ 4.5 instrumental catalogue from 1900 to 2019. To validate the seismic zones model, it compared with the structural elements map and given a rational matching. The new local seismic spots entire Egypt was discussed because of the invention in the seismic monitoring system entire Egypt and attributed to the misdetection and/or dislocation events due to the lack of monitoring system before the accomplished of ENSN. In conclusion, a validated active seismic zones map of Egypt was delineated using real and accurate seismic and geologic data based on powerful assumptions.
{"title":"Evolution in seismic monitoring system and updating seismic zones of Egypt","authors":"E. Fergany, K. Omar, Gad-El-Kareem A. Mohammed","doi":"10.1080/20909977.2020.1803661","DOIUrl":"https://doi.org/10.1080/20909977.2020.1803661","url":null,"abstract":"ABSTRACT On 3 September 2015, an unexpected earthquake with magnitude MB = 4.5 occurred in a completely silent area, located at 40 km south El Alamein city north western desert, where there are ~ 20 million pieces of unexploded ordnance. This study aims to: i) review and interpret the widespread seismic activity in Egypt during the last three decades, and ii) delineate the active seismic source zones map of Egypt based on realistic assumptions. These assumptions include only the real and accurate seismic events from the whole earthquake catalogue of Egypt. The idea based on the accuracy of the monitoring system, magnitude size of earthquakes, and detailed structure elements map of Egypt. The seismic catalogue of Egypt was updating to the end of 2019 including the historical and instrumental earthquakes since −2200 BC. The seismicity map of Egypt was outlined along five interval periods based on the significant evolution in the seismic monitoring system. The advanced monitoring period in the detection and location of seismic events in entire Egypt was supposed to begin in 2003 where the ENSN almost accomplished. Seismicity of advanced monitoring period 2003–2019 can be used as a tracer of real seismicity boundaries entire Egypt. Active seismic source zones map was delineated based on the advanced monitoring period and the unified Mw ≥ 4.5 instrumental catalogue from 1900 to 2019. To validate the seismic zones model, it compared with the structural elements map and given a rational matching. The new local seismic spots entire Egypt was discussed because of the invention in the seismic monitoring system entire Egypt and attributed to the misdetection and/or dislocation events due to the lack of monitoring system before the accomplished of ENSN. In conclusion, a validated active seismic zones map of Egypt was delineated using real and accurate seismic and geologic data based on powerful assumptions.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"29 1","pages":"548 - 557"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79834560","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: 10.1080/20909977.2020.1713583
M. Youssef
ABSTRACT Ain El-Soukhna area is an important industrial area for building and construction, so we used the subsurface shallow geophysical method, as represented by geoelectric resistivity measurements (Vertical Electric Sounding (VES)). These are processed and interpreted in the forms of a geologic model composed of five geoelectric layers of varying resistivities, lithologies, depthsand thicknesses. The thickness and true resistivity maps of the different layers and 2D geoelectric cross sections are generated for the represented layers to delineate their spatial distribution. The geoelectric Dar-Zarrouk parameters (Transverse Resistance and Longitudinal Conductance) were used to evaluate the electric anisotropy and aquifer hydraulic characteristics; such as hydraulic conductivity and transmissivity within the aquifer, as well as the groundwater quality (salinity of the aquifer) are estimated the true resistivity values acquired on the surface through the geoelectric resistivity survey.
Ain El-Soukhna地区是一个重要的建筑和建设工业区，因此我们采用了以地电阻率测量(垂直电测深)为代表的地下浅层地球物理方法。这些被处理和解释为地质模型的形式，该模型由五个不同电阻率、岩性、深度和厚度的地电层组成。生成不同层的厚度图、真电阻率图和二维地电剖面，圈定各层的空间分布。采用地电Dar-Zarrouk参数(横向电阻和纵向电导)评价了各向异性和含水层水力特征;如含水层内的水力导电性和透射率，以及地下水质量(含水层的盐度)是通过地电阻率测量在地表获得的真实电阻率值来估计的。
{"title":"Geoelectrical analysis for evaluating the aquifer hydraulic characteristics in Ain El-Soukhna area, West Gulf of Suez, Egypt","authors":"M. Youssef","doi":"10.1080/20909977.2020.1713583","DOIUrl":"https://doi.org/10.1080/20909977.2020.1713583","url":null,"abstract":"ABSTRACT Ain El-Soukhna area is an important industrial area for building and construction, so we used the subsurface shallow geophysical method, as represented by geoelectric resistivity measurements (Vertical Electric Sounding (VES)). These are processed and interpreted in the forms of a geologic model composed of five geoelectric layers of varying resistivities, lithologies, depthsand thicknesses. The thickness and true resistivity maps of the different layers and 2D geoelectric cross sections are generated for the represented layers to delineate their spatial distribution. The geoelectric Dar-Zarrouk parameters (Transverse Resistance and Longitudinal Conductance) were used to evaluate the electric anisotropy and aquifer hydraulic characteristics; such as hydraulic conductivity and transmissivity within the aquifer, as well as the groundwater quality (salinity of the aquifer) are estimated the true resistivity values acquired on the surface through the geoelectric resistivity survey.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"1998 1","pages":"85 - 98"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88247349","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: 10.1080/20909977.2020.1728893
R. E. El Qassas, M. Salaheldin, S. M. Assran, Th. Abdel Fattah, M. Rashed
ABSTRACT Wadi Queih and Wadi Safaga lie in the central part of the Eastern Desert of Egypt. The airborne gamma-ray spectrometric data of the study area have been interpreted qualitatively and quantitatively and correlated with the surface lithologic units to define the anomalous uranium zones and to reveal if any association is present between the radiometric anomalies and the structural trends.The radiometric data have been treated statistically. The results revealed that the area has a wide range of radioactivity ranging from 0.1 to 23.6 Ur for the total-count (TC), 0.1 to 3.3 % for potassium (K), 0.01 to 19.1 ppm for equivalent uranium (eU), and 0.29 to 18.9 ppm for equivalent thorium (eTh). The calculated CV values for all the rock units in the study area are less than 100% for three radio-elements (K, eU, eTh), except for potassium in Thebes Formation. The younger granites and Duwi Formation have the highest radiometric values. The lowest values exist over ophiolitic metagabbro, basic metavolcanics, metasediments, serpentinites, and Umm Gheig Formation. The generated composite radio-elements and composite image maps define the locations of the high anomalous radiometric and eU zones as bright white areas. The most radioactive anomalies have NW-SE and NE-SW trends.
{"title":"Airborne gamma-ray spectrometric data interpretation on Wadi Queih and Wadi Safaga area, Central Eastern Desert, Egypt","authors":"R. E. El Qassas, M. Salaheldin, S. M. Assran, Th. Abdel Fattah, M. Rashed","doi":"10.1080/20909977.2020.1728893","DOIUrl":"https://doi.org/10.1080/20909977.2020.1728893","url":null,"abstract":"ABSTRACT Wadi Queih and Wadi Safaga lie in the central part of the Eastern Desert of Egypt. The airborne gamma-ray spectrometric data of the study area have been interpreted qualitatively and quantitatively and correlated with the surface lithologic units to define the anomalous uranium zones and to reveal if any association is present between the radiometric anomalies and the structural trends.The radiometric data have been treated statistically. The results revealed that the area has a wide range of radioactivity ranging from 0.1 to 23.6 Ur for the total-count (TC), 0.1 to 3.3 % for potassium (K), 0.01 to 19.1 ppm for equivalent uranium (eU), and 0.29 to 18.9 ppm for equivalent thorium (eTh). The calculated CV values for all the rock units in the study area are less than 100% for three radio-elements (K, eU, eTh), except for potassium in Thebes Formation. The younger granites and Duwi Formation have the highest radiometric values. The lowest values exist over ophiolitic metagabbro, basic metavolcanics, metasediments, serpentinites, and Umm Gheig Formation. The generated composite radio-elements and composite image maps define the locations of the high anomalous radiometric and eU zones as bright white areas. The most radioactive anomalies have NW-SE and NE-SW trends.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"25 1","pages":"155 - 167"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84708700","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: 10.1080/20909977.2020.1788270
Hussien M. Hussien, M. Yousif, Abdelfatah El Sheikh
ABSTRACT The investigations of groundwater occurrences and its recharge mechanisms in structurally controlled terrain under arid environments are necessary for developing sustainable management strategies. In current study, an interdisciplinary approach includes readily accessible climatic, geological, topographic, and hydrological datasets together with satellite imagery and field data, were employed for better understand of the groundwater regime existing under special geological setting. Our findings indicate that: 1) the Araba sandstone aquifer has maximum thickness of about 220 m in some area controlled by structural setting, particularly the basement uplift, 2) the hydrologic analyses of this basin revealed that it received a total 52.66 × 106 m3 of rainfall between July 2018 to June 2019 that led to runoff volume about 29.47 × 106 m3 with total losses amounts about 23.2 × 106 m3, 3) topographically-driven modern recharge to the structural controlled terrain (Wadi El Morra) can be occurred, and therefore further investigation related to the aquifer response to climate variability, are required. The study suggested a management plan to capitalize the available surface water potentialities of El Morra basin through establishing three lakes that store water and enhance the groundwater recharge opportunities. In addition, three regions are selected for future groundwater exploration based on geological and subsurface data.
{"title":"Investigation of groundwater occurrences in structurally controlled terrain, based on geological studies and remote sensing data: Wadi El Morra, South Sinai, Egypt","authors":"Hussien M. Hussien, M. Yousif, Abdelfatah El Sheikh","doi":"10.1080/20909977.2020.1788270","DOIUrl":"https://doi.org/10.1080/20909977.2020.1788270","url":null,"abstract":"ABSTRACT The investigations of groundwater occurrences and its recharge mechanisms in structurally controlled terrain under arid environments are necessary for developing sustainable management strategies. In current study, an interdisciplinary approach includes readily accessible climatic, geological, topographic, and hydrological datasets together with satellite imagery and field data, were employed for better understand of the groundwater regime existing under special geological setting. Our findings indicate that: 1) the Araba sandstone aquifer has maximum thickness of about 220 m in some area controlled by structural setting, particularly the basement uplift, 2) the hydrologic analyses of this basin revealed that it received a total 52.66 × 106 m3 of rainfall between July 2018 to June 2019 that led to runoff volume about 29.47 × 106 m3 with total losses amounts about 23.2 × 106 m3, 3) topographically-driven modern recharge to the structural controlled terrain (Wadi El Morra) can be occurred, and therefore further investigation related to the aquifer response to climate variability, are required. The study suggested a management plan to capitalize the available surface water potentialities of El Morra basin through establishing three lakes that store water and enhance the groundwater recharge opportunities. In addition, three regions are selected for future groundwater exploration based on geological and subsurface data.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"55 1","pages":"512 - 531"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85070933","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: 10.1080/20909977.2020.1784697
Abdelnasser Mohamed, Sayed Mohamed Ali, A. Mostafa
ABSTRACT The Horizontal-to-Vertical Spectral Ratio (HVSR) technique is one of the most suitable tools for estimating the geological effect on ground motion. The main target of this study is to estimate the site effect and the fragility index value at the new Tiba City proposed extension. To achieve these targets, 21 ambient vibration recordings were conducted with 1 km grid to cover the investigated area. The estimated predominant frequency (f0) distribution is a relative uniform and occurs at low frequency, ranging from 0.35 to 0.75 Hz and its maximum corresponding amplitude of seismic wave (A0) starts from 3.1 up to 6.5. The qualitative interpretation of loose sedimentary cover thickness is large (136 to 410 m with average ~270 m) that coincided with occurrence of (f0) at low level. The fragility index for the ground (Kg) at each measured site was computed depending on the estimated H/V amplitude and corresponding (f0), and found to range from 17 to 118 across the investigated area. The highest values of Kg were obviously found in the northeastern part of the proposed site, where the highest amplification factor and the lowest fundamental frequency are found.
{"title":"Estimation of seismic site effect at the new Tiba City proposed extension, Luxor, Egypt","authors":"Abdelnasser Mohamed, Sayed Mohamed Ali, A. Mostafa","doi":"10.1080/20909977.2020.1784697","DOIUrl":"https://doi.org/10.1080/20909977.2020.1784697","url":null,"abstract":"ABSTRACT The Horizontal-to-Vertical Spectral Ratio (HVSR) technique is one of the most suitable tools for estimating the geological effect on ground motion. The main target of this study is to estimate the site effect and the fragility index value at the new Tiba City proposed extension. To achieve these targets, 21 ambient vibration recordings were conducted with 1 km grid to cover the investigated area. The estimated predominant frequency (f0) distribution is a relative uniform and occurs at low frequency, ranging from 0.35 to 0.75 Hz and its maximum corresponding amplitude of seismic wave (A0) starts from 3.1 up to 6.5. The qualitative interpretation of loose sedimentary cover thickness is large (136 to 410 m with average ~270 m) that coincided with occurrence of (f0) at low level. The fragility index for the ground (Kg) at each measured site was computed depending on the estimated H/V amplitude and corresponding (f0), and found to range from 17 to 118 across the investigated area. The highest values of Kg were obviously found in the northeastern part of the proposed site, where the highest amplification factor and the lowest fundamental frequency are found.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"4 1","pages":"499 - 511"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90995101","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: 10.1080/20909977.2020.1755479
A. Saber, H. Abdel Basset, M. Morsy, F. El-Hussainy, M. Eid
ABSTRACT In this paper the integrated chemistry-climate model (RegCM4-CHEM) was used to study the characteristics of the simulated pollutants and atmospheric conditions over Egypt with a focus on the Nile Delta (ND) region. The densely populated ND region is known for its severe air quality issues driven by high levels of anthropogenic pollution in conjunction with natural sources such as dust, and agricultural burning events. The data used in our study is from Monitoring Atmospheric Composition and Climate reanalysis data (2003–2010) and from the RegCM4-CHEM model simulation (2001–2010) over Egypt. It is found that surface ozone (O3) has higher values during the period from May to September that indicates their sensitivity to temperature and sinking air above the subtropical high pressure during these hot months. Higher values of carbon monoxide (CO) occur in winter associated with the largest amounts of fuel burning in winter. The higher values of formaldehyde (HCHO) occur in summer associated with high temperatures and an abundance of OH (hydroxyl radical). The higher values of NOy appear in summer months, September and October in the layer between 1000 and 300 hPa, it is in the upper layer is generally greater than in the middle because it contains nitrogen oxide (NOx), which regarded as a catalyst in O3 loss and production.
{"title":"Characteristics of the simulated pollutants and atmospheric conditions over Egypt","authors":"A. Saber, H. Abdel Basset, M. Morsy, F. El-Hussainy, M. Eid","doi":"10.1080/20909977.2020.1755479","DOIUrl":"https://doi.org/10.1080/20909977.2020.1755479","url":null,"abstract":"ABSTRACT In this paper the integrated chemistry-climate model (RegCM4-CHEM) was used to study the characteristics of the simulated pollutants and atmospheric conditions over Egypt with a focus on the Nile Delta (ND) region. The densely populated ND region is known for its severe air quality issues driven by high levels of anthropogenic pollution in conjunction with natural sources such as dust, and agricultural burning events. The data used in our study is from Monitoring Atmospheric Composition and Climate reanalysis data (2003–2010) and from the RegCM4-CHEM model simulation (2001–2010) over Egypt. It is found that surface ozone (O3) has higher values during the period from May to September that indicates their sensitivity to temperature and sinking air above the subtropical high pressure during these hot months. Higher values of carbon monoxide (CO) occur in winter associated with the largest amounts of fuel burning in winter. The higher values of formaldehyde (HCHO) occur in summer associated with high temperatures and an abundance of OH (hydroxyl radical). The higher values of NOy appear in summer months, September and October in the layer between 1000 and 300 hPa, it is in the upper layer is generally greater than in the middle because it contains nitrogen oxide (NOx), which regarded as a catalyst in O3 loss and production.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"142 4 1","pages":"402 - 419"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83862833","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: 10.1080/20909977.2020.1765275
H. H. E. Kadi, S. Shebl, M. Ghorab, A. Azab, M. Salama
ABSTRACT Abu Madi Formation is a gas fertile rock unit in Nile Delta basin and the main gas production rocks in Baltim fields which located in the Mediterranean sea, north of Baltim city, Egypt. This rock unit in the study area contains two gas productive sand zones; these are zone III main and zone III lower. The lithologic components of Abu Madi Formation that defined from the dia-porosity (density–neutron) cross-plot and the tri-porosity (RHOMAA–DTMAA) cross-plot, showing that, Abu Madi Formation consists mainly of sandstone, shale, shaly sandstone in some parts and calcareous material. The resultant petrophysical parameter values, revealed that, both zone III main and zone III lower in the area under investigation show potential in their petrophysical characteristics, as a fertile gas reservoir. Zone III lower shows the most advanced petrophysical characterisation as a desired reservoir, with lower value of shale volume of 4%, good effective porosity of 17% and higher value of hydrocarbon saturation of 70%. Finally, these reservoirs are bounded by two normal faults with remarkable displacement. The first fault located at south, strike E - W and dips toward the North, the other fault located north, trending NE- SW and dips to the north.
Abu Madi组位于埃及巴尔提姆市以北的地中海沿岸，是尼罗河三角洲盆地的富气岩单元，也是巴尔提姆气田的主要产气岩。研究区该岩单元含2个产气砂带;这些是第三区主要和第三区较低。通过介质-孔隙度(密度-中子)交叉图和三孔隙度(RHOMAA-DTMAA)交叉图确定了Abu Madi组的岩性成分，表明Abu Madi组主要由砂岩、页岩、部分泥质砂岩和钙质物质组成。岩石物性参数值表明，研究区主III带和下III带均具有丰富的储层岩石物性特征。下III区岩石物性特征最先进，页岩体积值较低，为4%，有效孔隙度较好，为17%，烃饱和度较高，为70%，为理想储层。最后，这些储层被两条位移显著的正断层所包围。第一个断层位于南部，走向东西向，向北倾;另一个断层位于北部，走向NE- SW，向北倾。
{"title":"Evaluation of Abu Madi Formation in Baltim North & East gas fields, Egypt, using seismic interpretation and well log analysis","authors":"H. H. E. Kadi, S. Shebl, M. Ghorab, A. Azab, M. Salama","doi":"10.1080/20909977.2020.1765275","DOIUrl":"https://doi.org/10.1080/20909977.2020.1765275","url":null,"abstract":"ABSTRACT Abu Madi Formation is a gas fertile rock unit in Nile Delta basin and the main gas production rocks in Baltim fields which located in the Mediterranean sea, north of Baltim city, Egypt. This rock unit in the study area contains two gas productive sand zones; these are zone III main and zone III lower. The lithologic components of Abu Madi Formation that defined from the dia-porosity (density–neutron) cross-plot and the tri-porosity (RHOMAA–DTMAA) cross-plot, showing that, Abu Madi Formation consists mainly of sandstone, shale, shaly sandstone in some parts and calcareous material. The resultant petrophysical parameter values, revealed that, both zone III main and zone III lower in the area under investigation show potential in their petrophysical characteristics, as a fertile gas reservoir. Zone III lower shows the most advanced petrophysical characterisation as a desired reservoir, with lower value of shale volume of 4%, good effective porosity of 17% and higher value of hydrocarbon saturation of 70%. Finally, these reservoirs are bounded by two normal faults with remarkable displacement. The first fault located at south, strike E - W and dips toward the North, the other fault located north, trending NE- SW and dips to the north.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"26 1","pages":"449 - 458"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80575370","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: 10.1080/20909977.2020.1714176
S. Nawar, A. Morcos, R.M. El Agmy, G. Gad, Samar Elgohary
ABSTRACT Most of the previously published results of the zenith sky twilight brightness, obtained by different investigators, are given in different units. These results have been converted to (mag/arcsec2) to make a comparison between them. The variation of the colour indices (B-V) and (B-R) of the zenith sky twilight with the sun’s depression will be studied. The present photometric results of the zenith sky twilight brightness expressed in mag/arcsec2, have been obtained for the first time for blue, yellow and red colours.
{"title":"Sky twilight brightness at zenith expressed in magnitudes","authors":"S. Nawar, A. Morcos, R.M. El Agmy, G. Gad, Samar Elgohary","doi":"10.1080/20909977.2020.1714176","DOIUrl":"https://doi.org/10.1080/20909977.2020.1714176","url":null,"abstract":"ABSTRACT Most of the previously published results of the zenith sky twilight brightness, obtained by different investigators, are given in different units. These results have been converted to (mag/arcsec2) to make a comparison between them. The variation of the colour indices (B-V) and (B-R) of the zenith sky twilight with the sun’s depression will be studied. The present photometric results of the zenith sky twilight brightness expressed in mag/arcsec2, have been obtained for the first time for blue, yellow and red colours.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"1 1","pages":"63 - 70"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90898440","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: 10.1080/20909977.2020.1711696
H. M. El Shayeb, G. Abdel-Gawad, A. Noah, M. M. Abuelhasan, M. A. Ataallah
ABSTRACT The Sequoia Field, in West Delta Deep Marine concession, represents deep marine slope channels in Nile Delta of Egypt. The main hydrocarbon bearing formation is the Late Pliocene El Wastani Formation. Sequoia Channel of the El Wastani Formation are considered as the main reservoirs of Sequoia Field. Well log data analysis, of five wells were accomplished using computer software programs (e.g. Interactive petrophysics (I.P.) Software was used in petrophysical evaluation for Petrophysical analysis, in terms of determining the effective porosity, shale volume, and reservoir fluid saturation of Sequoia Channel of El Wastani Formation, is the primary aim of this study in order to achieve better determination of the reservoir quality in Sequoia Field. We found that Sequoia Channel of El Wastani Formation is having high storage capacity properties permit them of bearing a good amount of hydrocarbon fluids in the Sequoia Field. It was found that effective porosity ranges between 19% and 29%, shale content ranges between 10% and 28%, the water saturation ranges between 15% and 40%. It is clear that the facies effect is the main factor that is controlling the distribution of the petrophysical properties.
{"title":"Sequoia reservoir evaluation through conventional petrophysical analysis in Eastern Mediterranean, Nile Delta, Egypt","authors":"H. M. El Shayeb, G. Abdel-Gawad, A. Noah, M. M. Abuelhasan, M. A. Ataallah","doi":"10.1080/20909977.2020.1711696","DOIUrl":"https://doi.org/10.1080/20909977.2020.1711696","url":null,"abstract":"ABSTRACT The Sequoia Field, in West Delta Deep Marine concession, represents deep marine slope channels in Nile Delta of Egypt. The main hydrocarbon bearing formation is the Late Pliocene El Wastani Formation. Sequoia Channel of the El Wastani Formation are considered as the main reservoirs of Sequoia Field. Well log data analysis, of five wells were accomplished using computer software programs (e.g. Interactive petrophysics (I.P.) Software was used in petrophysical evaluation for Petrophysical analysis, in terms of determining the effective porosity, shale volume, and reservoir fluid saturation of Sequoia Channel of El Wastani Formation, is the primary aim of this study in order to achieve better determination of the reservoir quality in Sequoia Field. We found that Sequoia Channel of El Wastani Formation is having high storage capacity properties permit them of bearing a good amount of hydrocarbon fluids in the Sequoia Field. It was found that effective porosity ranges between 19% and 29%, shale content ranges between 10% and 28%, the water saturation ranges between 15% and 40%. It is clear that the facies effect is the main factor that is controlling the distribution of the petrophysical properties.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"24 1","pages":"52 - 62"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72705470","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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