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Evaluation of Hydrocarbon Potential Using AVO Analysis in the FORMAT Field, Niger Delta Basin, Nigeria

Open Journal of Geology 2024年第3期14卷 403-430页

作者： Charles Chibueze Ugbor onyebuchi Samuel Onyeabor Ifeanyi Celestine ugwuoke Department of Geology University of Nigeria Nsukka Enugu State Nigeria

The study involved the evaluation of the hydrocarbon potential of FORMAT Field, coastal swamp depobelt Niger delta, Nigeria to obtain a more efficient reservoir characterization and fluid properties identification. Despite advances in seismic data interpretation using traditional 3D seismic data interpretation, obtaining adequate reservoir characteristics at the finest level had proved very challenging with often disappointing results. A method that integrates the amplitude variation with offfset (AVO) analysis is hereby proposed to better illuminate the reservoir. The Hampson Russell 10.3 was used to integrate and study the available seismic and well data. The reservoir of interest was delineated using the available suite of petrophysical data. This was marked by low gamma ray, high resistivity, and low acoustic impedance between a true subsea vertical depth (TVDss) range of 10,350 - 10,450 ft. The AVO fluid substitution yielded a decrease in the density values of pure gas (2.3 - 1.6 g/cc), pure oil (2.3 - 1.8 g/cc) while the Poisson pure brine increased (2.3 to 2.8 g/cc). Result from FORMAT 26 plots yielded a negative intercept and negative gradient at the top and a positive intercept and positive gradient at the Base which conforms to Class III AVO anomaly. FORMAT 30 plots yielded a negative intercept and positive gradient at the top and a positive intercept and negative gradient at the Base which conforms to class IV AVO anomaly. AVO attribute volume slices decreased in the Poisson ratio (0.96 to - 1.0) indicating that the reservoir contains hydrocarbon. The s-wave reflectivity and the product of the intercept and gradient further clarified that there was a Class 3 gas sand in the reservoir and the possibility of a Class 4 gas sand anomaly in that same reservoir.

关键词： AVO Analysis Hydrocarbon Potential Fluid Properties Reservoir Characterization Petrophysical Data Hampson Russel

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RUNX1通过调节SOX2转录促进食管鳞状细胞癌干性

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皖南医学院学报 2024年第4期43卷 316-321页

作者：黄滔尤琦 Ifeanyi Christian onyebuchi 朱少金皖南医学院第一附属医院弋矶山医院胸外科安徽芜湖241001

目的:探讨RUNT相关转录因子1(RUNX1)在食管鳞状细胞癌中的表达及其对细胞干性的影响。方法:从GEPIA数据库和GEO数据库(GSE111011)获取RUNX1的表达情况,使用TCGA数据库分析基因表达相关性。利用Western blot检测RUNX1、SOX2、OCT4、KLF4... 详细信息

目的:探讨RUNT相关转录因子1(RUNX1)在食管鳞状细胞癌中的表达及其对细胞干性的影响。方法:从GEPIA数据库和GEO数据库(GSE111011)获取RUNX1的表达情况,使用TCGA数据库分析基因表达相关性。利用Western blot检测RUNX1、SOX2、OCT4、KLF4和c-MYC蛋白表达情况。利用qRT-PCR技术检测CD271、CD44、CD54、SOX2和RUNX1的mRNA水平,双荧光素酶报告基因实验检测SOX2启动子活性。通过细胞成球培养和流式细胞术检测侧群细胞和CD271^(+)/CD44^(+)细胞的数量反映细胞干性。结果:GEPIA数据库、GEO数据库和Western blot结果均显示RUNX1在食管癌中高表达。在Eca-109细胞中敲低RUNX1后,抑制SOX2表达和细胞干性(P<0.01)。在KYSE-150细胞中过表达RUNX1后,促进SOX2表达和细胞干性增加(P<0.01)。在KYSE-150细胞中同时过表达RUNX1和敲低SOX2后,RUNX1促进的细胞干性增加被逆转(P<0.01)。双荧光素酶报告基因实验结果显示RUNX1促进SOX2启动子活性,在转录水平调节SOX2表达。结论:RUNX1在食管鳞状细胞癌中高表达,并通过在转录水平调节SOX2表达,从而促进细胞干性。

关键词： RUNT相关转录因子1 性别决定区Y框蛋白2 干性食管鳞状细胞癌

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Scaling up Nigeria’s Midwives Service Scheme and Reducing Inequality Gaps in Maternal Mortality

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Open Journal of Obstetrics and Gynecology 2017年第8期7卷 880-896页

作者： emmanuel onyebuchi Onugha St. Camillus Catholic Hospital Uromi Nigeria

The Federal Government of Nigeria in December 2009 launched midwives service scheme to address the shortage of skilled healthcare workforce needed to drive the efforts at improving maternal and infant health, towards the attainment of MDGS 4 and 5. This was in response to the unrelenting increase in maternal mortality in Nigeria. This review explores the implementation of the scheme and the extent to which its set-goals are achieved vis-à-vis many challenges confronting it. The review first explores the ecologic perspective on maternal mortality to identify factors responsible for high mortality among Nigerian women and the inequality gaps in maternal mortality. The review identifies the need to scale up midwives service scheme to areas in dire health needs, identifies the need for health needs assessment, and recognizes community participation as an essential ingredient in ensuring the sustainability of midwives service scheme. Routine evaluation of midwives service scheme is identified as an important tool for assessing the effectiveness of the scheme in achieving its objectives towards improvement in maternal health and reduction in inequality gaps in maternal mortality. The review proposes multi-sectoral interventions in tackling inequality gaps in maternal mortality with strategic focus on addressing inequalities in health and social determinants of health.

关键词： Midwives Service Scheme Maternal Mortality Inequality Nigeria

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The impact of COVID-19 on the birth rate in Nigeria:a report from population-based registries

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Infectious Diseases Research 2023年第1期4卷 14-18页

作者： Charlotte Blanche Oguejiofor Kenechi Miracle Ebubechukwu George Uchenna Eleje emmanuel onyebuchi ugwu Joseph Tochukwu Enebe Kingsley Emeka Ekwuazi Chukwuemeka Chukwubuikem Okoro Boniface Chukwuneme Okpala Charles Chukwunomunso Okafor Nnanyelugo Chima Ezeora Emeka Ifeanyi Iloghalu Chidebe Christian Anikwe Chigozie Geoffrey Okafor Polycarp Uchenna Agu Emeka Philip Igbodike Iffiyeosuo Dennis Ake Arinze Anthony Onwuegbuna Osita Samuel Umeononihu Onyedika Promise Anaedu Odigonma Zinobia Ikpeze David Chibuike Ikwuka Henry Ifeanyi Nwaolisa Ekene Agatha Emeka Jude Ogechukwu Okoye Ihechinyerem Kelechi Osuagwu Angela Ogechukwu ugwu Toochukwu Benjamin Ejikeme Eziamaka Pauline Ezenkwele Chijioke Ogomegbunam Ezeigwe Malarchy Ekwunife Nwankwo Gerald Okanandu Udigwe Joseph Ifeanyichukwu Ikechebelu Grace Agbaeze Chukwuebuka Divine Nwanja Ahizechukwu Chigoziem Eke Department of Obstetrics and Gynecology Nnamdi Azikiwe University Teaching HospitalNnewi PMB 5025Nigeria Preventive Medicine and Research Department Clina-Lancet LaboratoriesVictoria IslandLagos 101241Nigeria Effective Care Research Unit Department of Obstetrics and GynecologyNnamdi Azikiwe UniversityNnewi Campus 435001Nigeria Department of Obstetrics and Gynecology College of MedicineUniversity of Nigeria Enugu CampusEnuguEnugu State 400102Nigeria Department of Obstetrics and Gynecology University of Nigeria Teaching HospitalItuku OzallaEnugu State 400102Nigeria Department of Obstetrics and Gynecology ESUT Teaching HospitalParklaneEnugu 400102Nigeria Medical Department Divine Medical CentreSouth West IkoyiLagos 1001233Nigeria Department of Obstetrics and Gynecology Havana Specialist HospitalSurulereLagos 100011Nigeria Clinical Trial Division Drug Evaluation and Research DirectorateNAFDAC office ComplexLagos 100011Nigeria Department of Ophthalmology Nnamdi Azikiwe UniversityNnewi campus 435001Nigeria Department of Human Physiology Nnamdi Azikiwe University NnewiAnambra State 435001Nigeria Department of Family Medicine Faculty of MedicineNnamdi Azikiwe UniversityAwka 435001Nigeria Department of Medical Laboratory Science Faculty of Health Sciences and TechnologyNnamdi Azikiwe UniversityAwka 435001Nigeria Department of Health Services Federal University of TechnologyOwerri 460103Nigeria Department of Haematology and Immunology College of MedicineUniversity of Nigeria Enugu CampusEnuguEnugu State 400102Nigeria Musgrove Park Hospital Somerset NHS Foundation TrustUnited Kingdom TLTp Medical(UHS) Southampton WS15United Kingdom Division of Maternal Fetal Medicine Department of Gynecology and ObstetricsJohns Hopkins University School of MedicineBaltimore 21201U.S.A

Background and objectives:Coronavirus disease 2019(COVID-19)is a pandemic that has become a major source of morbidity and mortality worldwide,affecting the physical and mental health of individuals influencing *** the threat,it poses to maternal health in sub-Saharan Africa and Nigeria,there is little or no data on the impact it has on fertility,conception,gestation and *** compare the birth rate between pre-COVID and COVID times using selected months of the *** and methods:This was a secondary analysis of cross-sectional analytical study data from the birth registries of three tertiary hospitals,comparing two years[2019(Pre-COVID)]versus[2020(COVID era)]using three months of the year(October to December).The data relied upon was obtained from birth registries in three busy maternity clinics all within tertiary hospitals in South-East Nigeria and we aimed at discussing the potential impacts of COVID-19 on fertility in *** secondary outcome measures were;mode of delivery,booking status of the participants,maternal age and ***:There was a significant decrease in tertiary-hospital based birth rate by 92 births(P=0.0009;95%CI:-16.0519 to-4.1481)among mothers in all the three hospitals in 2020 during the COVID period(post lockdown months)of October to *** was a significant difference in the mode of delivery for mothers(P=0.0096)with a 95%confidence interval of 1.0664 to 1.5916,as more gave birth through vaginal delivery during the 2020 COVID-19 period than ***:Tertiary-hospital based birth rates were reduced during the *** multi-centre study extrapolated on possible factors that may have played a role in this decline in their birth rate,which includes but is not limited to;decreased access to hospital care due to the total lockdowns/curfews and worsening inflation and economic recession in the country.

关键词： birth rates COVID-19 lockdown Nigeria pandemic pre-COVID

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Sigmoid Volvulus, Intestinal Obstruction and Bowel Perforation;an Unusual Presentation of Pedunculated Fibroid Torsion. Case Report

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Case Reports in Clinical Medicine 2021年第10期10卷 308-313页

作者： emmanuel Mamah Azubuike onyebuchi Chichetaram Otu Nnaemeka Egbuonu Parakrama Happawana Department of Obstetrics and Gynaecology Homerton University Hospital NHS Foundation Trust London UK Federal Medical Centre Umuahia Nigeria Government House Clinic Abakaliki Nigeria Queens Hospital Romford Essex

Pedunculated fibroid torsion presenting as a case of acute abdomen from sigmoid volvulus and large bowel perforation is rare. Without prompt diagnosis and intervention, this could lead to serious morbidity and mortality. Ms FM was a 52-year-old perimenopusal woman who was admitted to the Intensive Therapy Unit (ITU) with worsening symptoms of confirmed Covid-19 infection. On the 10th day of her admission, she developed abdominal distension and tenderness. A pelvic ultrasound scan showed a large pedunculated fibroid measuring 23 × 15 × 22 cm. The plan was for conservative management to use pain killers. Following deterioration of her clinical state, an abdominal CT scan was done which confirmed a large uterine fibroid, large bowel distention. CT findings also showed sigmoid volvulus and large bowel perforation. Following a multidisciplinary team assessment, she had an emergency exploratory laparotomy with findings of a large, torted, pedunculated fibroid with adherent sigmoid colon which had become twisted and obstructed. The large bowel segment above the Sigmoid volvulus was grossly distended and there was a gangrenous hepatic flexure with perforation. She had a right hemicolectomy, a de-functioning colostomy and subtotal hysterectomy. Postoperatively, she made very good clinical improvement. Fibroid histology report showed tissue infarction and necrosis which confirmed the torsion. She was discharged home after making good recovery.

关键词： Case Report Bowel Perforation Fibroid Torsion Pedunculated Fibroid Sigmoid Volvulus

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Prevalence of Some World Health Organization Priority Organisms from an Abattoir at Kwata, Anambra State, Nigeria

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Advances in Microbiology 2023年第8期13卷 420-433页

作者： Ruth Asikiya Afunwa Chudi Igweze onyebuchi Gbadamosi Francis Ayodele Eze Cynthia Adanna Egbuna Roselyn Ikegbune Chidozie Nwakaeze emmanuel Amobi Department of Pharmaceutical Microbiology and Biotechnology Faculty of Pharmaceutical Sciences Chukwuemeka Odumegwu Ojukwu University Igbariam Nigeria Department of Biological Sciences Microbiology Unit Faculty of Applied and Environmental Sciences Godfrey Okoye University Enugu Nigeria

The abattoir is one of the important sectors in the food industry, therefore the need for close monitoring of everything concerning it to minimize microbial contamination. The aim of the study is to identify bacteria listed as WHO priority organisms associated with meat from Kwata abattoir in Awka, Anambra state. The study was carried out over a three (3) months period from September to December 2022. Thirteen samples were collected from the floor, table, water, meat, knife and soil in the abattoir. The samples were cultured using streak and spread plate methods on MacConkey and Cetrimide agar. The isolates were identified with the following biochemical tests: catalase, oxidase, citrate and indole tests. Ampiclox levofloxacin, gentamicin, ofloxacin impenem ceftraixone, cefixime, cefuroxime and nitrofurantoin were used for sensitivity test following Kirby Bauer disc diffusion method and biofilm formation was determined using the tube method. The 75 isolates obtained were identified as follows;29.3% E. coli, 26.7% Klebsiella spp., 16% Proteus spp., and 28% Pseudomonas spp. The result of antibiotics sensitivity test interpreted using the European Committee on Antimicrobial Susceptibility Testing (EUCAST) breakpoints showed that (98%) of the isolates were resistant to the antibiotics used. Test for biofilm formation with 52 isolates showed 31 strong, 12 moderate and 9 weak biofilm formers. The result of this study confirms the presence of bacteria contaminants within the WHO priority list in the abattoir, as such there is need for improved handling of animals. Slaughtering, cleaning and distribution of meat should be done using aseptic procedures. .

关键词： Abattoir WHO Priority Organisms Antibiotic Resistance Community

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Assessment of the Spectral Decomposition Techniques in the Evaluation of Hydrocarbon Potential of “BOMS” Field, Coastal Swamp Niger Delta, Nigeria

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International Journal of Geosciences 2023年第7期14卷 655-676页

作者： Charles Chibueze Ugbor onyebuchi Samuel Onyeabor Department of Geology University of Nigeria Nsukka Nigeria

This study employs the different approaches of the spectral decomposition techniques to evaluate the hydrocarbon potential of the reservoir and analyse to determine the most efficient spectral decomposition technique with better resolution using the “BOMS” Field, coastal swamp depobelt Niger Delta, Nigeria. A good number of drilled wells have failed both in the Niger Delta Basin and other basins due to a poor understanding of the reservoir properties in advance of drilling and identifying the best approach will help to minimize this risk. Seismic and well logs data together with the Hampson Russel 10.3 software were used for the study. The target reservoirs were identified from the suite of well logs at the horizons with low gamma ray, high resistivity, and low acoustic impedance between TVD (ft) of 10,350 - 10,450 ft. The analysis of the amplitude spectrum of the seismic data revealed that the distortion of interest lies between 5 - 60 Hz. Seismic data were then spectrally decomposed into several frequencies such as low frequency (15 Hz), mid-frequency (31 Hz), and high frequency (46 Hz) where distortions were observed. Time- frequency slices of 15 Hz and 23 Hz provided clearer events (potential hydrocarbon sand) indicated by high amplitude envelope (2200 - 2400) and amplitude anomalies. While the amplitude dropped in the mid-frequency (31 Hz), the high amplitude envelope and the high energy completely disappeared in the high (46 Hz) time-frequency slice. A comparison of the Short- time Fourier transform and the Basic Pursuit algorithm revealed that the Basic Pursuit provided a better resolution of the reservoir characteristics than the former. The Red, Green and Blue (RGB) colour blending model indicated that the channel was consistent with the low-frequency section and amplitude anomaly.

关键词： Amplitude Hydrocarbon Evaluation Spectral Analysis Reservoir Sand Basic Pursuit Convolution

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Quadcopter Design for Payload Delivery

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Journal of Computer and Communications 2016年第10期4卷 1-12页

作者： Gordon Ononiwu Ondoma Onojo Oliver Ozioko onyebuchi Nosiri Department of Electrical/Electronic Engineering Federal University of Technology Owerri Nigeria

This paper presents the design and implementation of a quadcopter capable of payload delivery. A quadcopter is a unique unmanned aerial vehicle which has the capability of vertical take-off and landing. In this design, the quadcopter was controlled wirelessly from a ground control station using radio frequency. It was modeled mathematically considering its attitude and altitude, and a simulation carried out in MATLAB by designing a proportional Integral Derivative (PID) controller was applied to a mathematical model. The PID controller parameters were then applied to the real system. Finally, the output of the simulation and the prototype were compared both in the presence and absence of disturbances. The results showed that the quadcopter was stable and able to compensate for the external disturbances.

关键词： Quadcopter PID Controller Payload Delivery Unmanned Aerial Vehicle

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Effects of Reneging, Server Breakdowns and Vacation on a Batch Arrival Single Server Queueing System with Three Fluctuating Modes of Service

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Open Journal of Optimization 2020年第4期9卷 105-128页

作者： Samuel Ugochukwu Enogwe H. onyebuchi Obiora-Ilouno Department of Statistics Michael Okpara University of Agriculture Umudike Nigeria Department of Statistics Nnamdi Azikiwe University Awka Nigeria

This article examines the effects of reneging, server breakdown and server vacation on the various states of the batch arrivals queueing system with single server providing service to customers in three fluctuating modes. In this queueing system, any batch arrival joins the queue if the server is busy or on vacation or under repair. However, if the server is free, one customer from the arriving batch joins the service immediately while others join the queue. In case of server breakdown, the customer whose service is interrupted returns back to the head of the queue. As soon as the server has is repaired, the server attends to the customer in mode 1. For this queueing system, customers that are impatient due to breakdown and server vacation may renege (leave the queue without getting service). Due to fluctuating modes of service delivery, the system may provide service with complete or reduced efficiency. Consequently, we construct the mathematical model and derive the probability generating functions of the steady state probabilities of several states of the system including the steady state queue size distribution. Further, we discuss some particular cases of the proposed queueing model. We present numerical examples in order to demonstrate the effects of server vacation and reneging on the various states of the system. The study revealed that an increase in reneging and a decrease in server vacation results in a decrease in server utilization and an increase in server’s idle time provided rates of server breakdown and repair completion are constant. In addition, the probability of server vacation, the probability of system is under repair and the probabilities that the server provides service in three fluctuating modes decreases due to an increase in reneging and a decrease in vacation completion rates.

关键词： Queueing Reneging Server Vacation Server Breakdowns Fluctuating Modes of Service

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Farmers’perceptions on cultivation and the impacts of climate change on goods and services provided by Garcinia kola in Nigeria

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Ecological Processes 2018年第1期7卷 425-434页

作者： onyebuchi Patrick Agwu Adama Bakayoko Saka Oladunni Jimoh Porembski Stefan WASCAL Graduate Research Program on Climate Change and Biodiversity Universite´Felix Houphouet BoignyBP 165Abidjan 31Côte d’Ivoire Centre Suisse de Recherches Scientifiques en Côte d’Ivoire(CSRS) UniversitéNangui AbrogouaAbidjanCôte d’Ivoire Department of Social and Environmental Forestry University of IbadanIbadanNigeria Institute for Biodiversity Research University of RostockRostockGermany

Background:Garcinia kola is an indigenous multipurpose tree species commonly found in the tropical rain forest zone of West and Central *** economic,ecological,and socio-cultural benefits for people,they have potentials to improve the regional and local income generation to the farmers but the cultivation of the species is very limited in ***:The study investigated cultivation and farmers’perceptions on the impacts of climate change on goods and services provided by *** in *** questioners and interviews were *** data obtained was analyzed using descriptive and inferential statistic such as frequency,percentage,chi-square,and multinomial logit regressions with SPSS Version 20 and R software Version ***:The results show that farmers are presently not cultivating ***,and most of the available stands were inherited from *** farmers still believe it is only God that can make *** to germinate;however,information about the new improved methods of raising *** was not spread across farmers’*** 93%of these farmers were not aware of these new methods,and the only means they raise the species is by picking the wildlings that regenerate naturally close to mother tree and are rarely *** finding also shows that farmers are well aware of climate change and its impact on crop productivity is not clear to *** result shows that five explanatory variables(age,gender,marital status,education level,household size and primary occupation)are the main factors significantly influencing farmers’perception of climate change and the cultivation of the *** interview section,the farmers reported variability of Harmattan season influences fruit production of the species;according to them,increase in Harmattan season usually leads to increase in fruiting of ***:Based on our findings,all the 215 respondent interviewed agree that climatic variability influences the availabi

关键词： Garcinia kola Propagation Multipurpose species Farmers Climate change Harmattan season

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