Understanding the origins of potential source rocks and unraveling the intricate connections between reservoir oils and their source formations in the Siwa Basin(Western Desert,Egypt)necessitate a thorough oil-source ...Understanding the origins of potential source rocks and unraveling the intricate connections between reservoir oils and their source formations in the Siwa Basin(Western Desert,Egypt)necessitate a thorough oil-source correlation investigation.This objective is achieved through a meticulous analysis of well-log responses,Rock-Eval pyrolysis,and biomarker data.The analysis of Total Organic Carbon across 31 samples representing Paleozoic formations in the Siwa A-1X well reveals a spectrum of organic richness ranging from 0.17 wt%to 2.04 wt%,thereby highlighting diverse levels of organic content and the presence of both Type II and Type III kerogen.Examination of the fingerprint characteristics of eight samples from the well suggests that the Dhiffah Formation comprises a blend of terrestrial and marine organic matter.Notably,a significant contribution from more oxidized residual organic matter and gas-prone Type III kerogen is observed.Contrarily,the Desouky and Zeitoun formations exhibit mixed organic matter indicative of a transitional environment,and thus featuring a pronounced marine influence within a more reducing setting,which is associated with Type II kerogen.Through analysis of five oil samples from different wells—SIWA L-1X,SIWA R-3X,SIWA D-1X,PTAH 5X,and PTAH 6X,it is evident that terrestrial organic matter,augmented by considerable marine input,was deposited in an oxidizing environment,and contains Type III kerogen.Geochemical scrutiny confirms the coexistence of mixed terrestrial organic matter within varying redox environments.Noteworthy is the uniformity of identified kerogen Types II and III across all samples,known to have potential for hydrocarbon generation.The discovery presented in this paper unveils captivating prospects concerning the genesis of oil in the Jurassic Safa reservoir,suggesting potential links to Paleozoic sources or even originating from the Safa Member itself.These revelations mark a substantial advancement in understanding source rock dynamics and their intricate relationship with reservoir oils within the Siwa Basin.By illuminating the processes of hydrocarbon genesis in the region,this study significantly enriches our knowledge base.展开更多
This research uses both three-dimensional(3D)modeling and geologic well control to piece back together the architectural parts of the Late Cretaceous formations.The goal is to figure out the sizes,directions,locations...This research uses both three-dimensional(3D)modeling and geologic well control to piece back together the architectural parts of the Late Cretaceous formations.The goal is to figure out the sizes,directions,locations,and controls of the layers of the fluvial sandstone reservoirs.Sequence stratigraphy is essential for 3D reservoir modeling and petroleum geology understanding in the Bahga oilfield.The purpose of this work is to create a static model that shows the layers and facies distribution in the reservoir interval.We will use data from nine well logs and 22 seismic lines calibrated by the Abu Roash G Member reservoir core intervals to accomplish this.The petrophysical study discovered three parts in the Abu Roash G Member reservoir rock:channel fill that is affected by tides,channel fill that is dominated by tides(intertidal sands),and channel top with lenticular bedded sandstone.The model's findings point to the existence of an NNW-oriented sand body,which could be a prime location to produce hydrocarbons.The original oil in place(OOIP)is about 3,438,279 Stock Tank Barrels(STB),and the oil reserve reaches up to 1,031,484(STB).Sequence stratigraphic analysis using seismic and well log information(SB)reveals that the Upper Cretaceous AR/G reservoir of the Bahga field is characterized by third-and fourth-order stratigraphic sequences,which are constrained by three Maximum Flooding Surfaces(MFS)and two Sequence Boundaries.The integration of the derived geological model and sequence stratigraphic results can lower future extraction risk by identifying the locations and trends of the geologic facies with the necessary petrophysical properties for the hydrocarbon accumulations.展开更多
Introduction: Chronic subdural hematoma (CSDH) is one of the most common types of intracranial hemorrhages and carries a significant morbidity;there is no clear optimal treatment. Recurrence, pneumocephaly and seizure...Introduction: Chronic subdural hematoma (CSDH) is one of the most common types of intracranial hemorrhages and carries a significant morbidity;there is no clear optimal treatment. Recurrence, pneumocephaly and seizures are common complications. We will evaluate outcome after inner membrane fenestration in comparison to burr-hole evacuation only in cases of CSDH. Patients and Methods: Our work was conducted on 20 patients with CSDH from February 2017 to July 2017. Endoscopic-assisted microscopic fenestration technique was used to do inner membrane fenestration in ten patients and the other 10 patients operated upon by traditional burr-hole evacuation. Regular follow up was done up to one month. Results: Clinical outcome was nearly the same in the two groups. Recurrence rate was only noted in the non-fenestration group (20%). Midline shift was better in the membrane fenestration group after one month and we experienced no intraoperative surgical complications related to the fenestration technique. Postoperative complications, such as Pneumocephalus and seizures, were seen in both study groups. Conclusion: Endoscopic assisted microscopic technique decreases surgical risks to do inner membrane fenestration although there is no major difference between doing fenestration or not in clinical outcome, but it may decrease recurrence, but larger studies are needed.展开更多
The northern portion of the Egyptian Western Desert is a very promising oil-producing province.The Abu Roash and Bahariya formations in Abu Sennan Field have a diverse lithological composition,leading to variances in ...The northern portion of the Egyptian Western Desert is a very promising oil-producing province.The Abu Roash and Bahariya formations in Abu Sennan Field have a diverse lithological composition,leading to variances in reservoir continuity both horizontally and vertically.The reservoir heterogeneity problem is addressed by utilizing datasets derived from five wells and 3D seismic data that covers the full region of Abu Sennan.The lithology and reservoir levels were determined using geophysical well data.The investigated formations consist of sandstone,carbonate,and shale.The“E”and“G”members of the Abu Roash Formation,in addition to the Bahariya Formation,have the highest potential for containing hydrocarbons.Abu Roash E has a range of net pay from 17–47 m,shale volume ranging from 17%to 36%,effective porosity ranging between 20%and 26%,and oil saturation ranging between 49%and 77%.The Abu Roash“G”has a net pay range of 7–34 m,a shale content ranging from 5%to 42%,an effective porosity between 10%and 24%,and a hydrocarbon saturation ranging from 46%to 60%.The Bahariya Formation has a vertical thickness of 12–62 m,with a percentage of shale ranging from 16%to 44%.The formation also exhibits an effective porosity ranging from 15%to 26%and an oil saturation ranging between 46%and 77%.Analyzed 3D seismic data were utilized to create depth-structure maps.Seismic data interpretation and petrophysical analysis enabled the creation of 3D models for the structures and reservoirs in the Abu Sennan region.The static models served as the main inputs for calculating the volumetrics and generating two additional interesting opportunities in the researched region.For the investigated reservoirs,the estimated stock tank oil in place was about 394,216,376,and 601(×106 m3)for AR/E,AR/F,AR/G,and Upper Baharyia,respectively.The projected volumes show the potential of the investigated intervals.展开更多
基金the research project is funded by Abdullah Alrushaid Chair for Earth Science Remote Sensing Research at King Saud University,Riyadh,Saudi Arabia.。
文摘Understanding the origins of potential source rocks and unraveling the intricate connections between reservoir oils and their source formations in the Siwa Basin(Western Desert,Egypt)necessitate a thorough oil-source correlation investigation.This objective is achieved through a meticulous analysis of well-log responses,Rock-Eval pyrolysis,and biomarker data.The analysis of Total Organic Carbon across 31 samples representing Paleozoic formations in the Siwa A-1X well reveals a spectrum of organic richness ranging from 0.17 wt%to 2.04 wt%,thereby highlighting diverse levels of organic content and the presence of both Type II and Type III kerogen.Examination of the fingerprint characteristics of eight samples from the well suggests that the Dhiffah Formation comprises a blend of terrestrial and marine organic matter.Notably,a significant contribution from more oxidized residual organic matter and gas-prone Type III kerogen is observed.Contrarily,the Desouky and Zeitoun formations exhibit mixed organic matter indicative of a transitional environment,and thus featuring a pronounced marine influence within a more reducing setting,which is associated with Type II kerogen.Through analysis of five oil samples from different wells—SIWA L-1X,SIWA R-3X,SIWA D-1X,PTAH 5X,and PTAH 6X,it is evident that terrestrial organic matter,augmented by considerable marine input,was deposited in an oxidizing environment,and contains Type III kerogen.Geochemical scrutiny confirms the coexistence of mixed terrestrial organic matter within varying redox environments.Noteworthy is the uniformity of identified kerogen Types II and III across all samples,known to have potential for hydrocarbon generation.The discovery presented in this paper unveils captivating prospects concerning the genesis of oil in the Jurassic Safa reservoir,suggesting potential links to Paleozoic sources or even originating from the Safa Member itself.These revelations mark a substantial advancement in understanding source rock dynamics and their intricate relationship with reservoir oils within the Siwa Basin.By illuminating the processes of hydrocarbon genesis in the region,this study significantly enriches our knowledge base.
文摘This research uses both three-dimensional(3D)modeling and geologic well control to piece back together the architectural parts of the Late Cretaceous formations.The goal is to figure out the sizes,directions,locations,and controls of the layers of the fluvial sandstone reservoirs.Sequence stratigraphy is essential for 3D reservoir modeling and petroleum geology understanding in the Bahga oilfield.The purpose of this work is to create a static model that shows the layers and facies distribution in the reservoir interval.We will use data from nine well logs and 22 seismic lines calibrated by the Abu Roash G Member reservoir core intervals to accomplish this.The petrophysical study discovered three parts in the Abu Roash G Member reservoir rock:channel fill that is affected by tides,channel fill that is dominated by tides(intertidal sands),and channel top with lenticular bedded sandstone.The model's findings point to the existence of an NNW-oriented sand body,which could be a prime location to produce hydrocarbons.The original oil in place(OOIP)is about 3,438,279 Stock Tank Barrels(STB),and the oil reserve reaches up to 1,031,484(STB).Sequence stratigraphic analysis using seismic and well log information(SB)reveals that the Upper Cretaceous AR/G reservoir of the Bahga field is characterized by third-and fourth-order stratigraphic sequences,which are constrained by three Maximum Flooding Surfaces(MFS)and two Sequence Boundaries.The integration of the derived geological model and sequence stratigraphic results can lower future extraction risk by identifying the locations and trends of the geologic facies with the necessary petrophysical properties for the hydrocarbon accumulations.
文摘Introduction: Chronic subdural hematoma (CSDH) is one of the most common types of intracranial hemorrhages and carries a significant morbidity;there is no clear optimal treatment. Recurrence, pneumocephaly and seizures are common complications. We will evaluate outcome after inner membrane fenestration in comparison to burr-hole evacuation only in cases of CSDH. Patients and Methods: Our work was conducted on 20 patients with CSDH from February 2017 to July 2017. Endoscopic-assisted microscopic fenestration technique was used to do inner membrane fenestration in ten patients and the other 10 patients operated upon by traditional burr-hole evacuation. Regular follow up was done up to one month. Results: Clinical outcome was nearly the same in the two groups. Recurrence rate was only noted in the non-fenestration group (20%). Midline shift was better in the membrane fenestration group after one month and we experienced no intraoperative surgical complications related to the fenestration technique. Postoperative complications, such as Pneumocephalus and seizures, were seen in both study groups. Conclusion: Endoscopic assisted microscopic technique decreases surgical risks to do inner membrane fenestration although there is no major difference between doing fenestration or not in clinical outcome, but it may decrease recurrence, but larger studies are needed.
基金supported by the Researchers Supporting Project number(RSPD2025R781),King Saud University,Riyadh,Saudi ArabiaThis research was funded by the Ministry of Science and Higher Education of the Russian Federation(Project No.FSNM-2024-0005).
文摘The northern portion of the Egyptian Western Desert is a very promising oil-producing province.The Abu Roash and Bahariya formations in Abu Sennan Field have a diverse lithological composition,leading to variances in reservoir continuity both horizontally and vertically.The reservoir heterogeneity problem is addressed by utilizing datasets derived from five wells and 3D seismic data that covers the full region of Abu Sennan.The lithology and reservoir levels were determined using geophysical well data.The investigated formations consist of sandstone,carbonate,and shale.The“E”and“G”members of the Abu Roash Formation,in addition to the Bahariya Formation,have the highest potential for containing hydrocarbons.Abu Roash E has a range of net pay from 17–47 m,shale volume ranging from 17%to 36%,effective porosity ranging between 20%and 26%,and oil saturation ranging between 49%and 77%.The Abu Roash“G”has a net pay range of 7–34 m,a shale content ranging from 5%to 42%,an effective porosity between 10%and 24%,and a hydrocarbon saturation ranging from 46%to 60%.The Bahariya Formation has a vertical thickness of 12–62 m,with a percentage of shale ranging from 16%to 44%.The formation also exhibits an effective porosity ranging from 15%to 26%and an oil saturation ranging between 46%and 77%.Analyzed 3D seismic data were utilized to create depth-structure maps.Seismic data interpretation and petrophysical analysis enabled the creation of 3D models for the structures and reservoirs in the Abu Sennan region.The static models served as the main inputs for calculating the volumetrics and generating two additional interesting opportunities in the researched region.For the investigated reservoirs,the estimated stock tank oil in place was about 394,216,376,and 601(×106 m3)for AR/E,AR/F,AR/G,and Upper Baharyia,respectively.The projected volumes show the potential of the investigated intervals.
