musa usman - Academia.edu (original) (raw)
Papers by musa usman
Traektoriâ nauki, Dec 31, 2021
امروزه تعداد روزافزونی از شرکت‌ها و سازمان‌ها عملیات خود را با استفاده از شاخص‌های اقتصادی، اجتما... more امروزه تعداد روزافزونی از شرکت‌ها و سازمان‌ها عملیات خود را با استفاده از شاخص‌های اقتصادی، اجتماعی، محیط‌زیستی و حاکمیت شرکتی، پایدار کرده و با استفاده از گزارشگری پایداری، عملکرد خود را اندازه‌گیری و اطلاع‌رسانی نمایند. هدف اصلی این پژوهش، بررسی نقش گزارشگری پایداری بر مدیریت سود باانگیزه دستیابی به آستانههای سود در شرکت‌های پذیرفته‌شده در بورس اوراق بهادار تهران است. در این پژوهش اطلاعات مربوط به 1098 سال - شرکت طی سال‌های 1390 تا 1395 گردآوری‌شده است. شاخص گزارشگری پایداری با بررسی ابعاد مختلف گزارشگری اقتصادی، اجتماعی، محیط‌زیستی و حاکمیت شرکتی اندازه‌گیری شده و روش آماری پژوهش معادلات ساختاری و مدل سازنده بوده است. نتایج آزمون فرضیه‌ها نشان می‌دهند بین شاخص پایداری با مدیریت سود باانگیزه دستیابی به آستانههای سود اجتناب از کاهش سود و اجتناب از سود غیرمنتظره منفی رابطه منفی و معنی‌داری وجود دارد. نتایج کلی حاصل از تحقیق بیانگر آن است که با افزایش شاخص پایداری، مدیرانی که در معرض اجتناب از کاهش سود و اجتناب از سود غیرمنتظره منفی قرار می‌گیرند با احتمال کمتری اقدام به مدیریت سود...
The general patriarchal character of the media aligns with the logic of commercialism which prior... more The general patriarchal character of the media aligns with the logic of commercialism which prioritizes profit and restricts the diversity of news content in favour of those who have the means of purchase. It explains why there is a male preponderance in media ownership, staffing and content consumption especially in Nigeria where women have access to, and appear in, the news far fewer times than men. This provokes a question: Does low content consumption by women influence the way media report them? This paper unravels these two variables within a political context. Content assessment and respondents’ rating of Nigeria’s dominant print media (1999-2003) shows a robust political reporting but with a gender differential that is heavily skewed towards men. Focus group evaluations of the situation show a connection between women’s low visibility in the news and inconsequential access to content. One evaluation attributes the scenario to unconscious reporting! That brings to the fore jo...
Journal of Family Medicine and Primary Care, 2018
Canterbury basin covers an approximate area of 40,000 km2, Canterbury basin is largely an offshor... more Canterbury basin covers an approximate area of 40,000 km2, Canterbury basin is largely an offshore basin extending slightly onshore southward across Canterbury plains and to the Southern Alps. This work aimed to correlates seismic sequences boundaries earlier interpreted with sedimentary sequence surfaces observed in cores recovered from the four sites drilled across the shelf by expedition 317. This work utilises well data obtained from Integrated Ocean Drilling Program (IODP) expedition 317. The expedition which targeted stratigraphic seismic sequences earlier interpreted from the seismic data acquired on the eastern margin of the south island of New Zealand (offshore Canterbury). Three synthetic seismograms were created from well U1351B, U1353C and U1352B which both contain sets of sonic and density logs at variable length, this is to provide a direct means of comparison between the sequence boundaries interpreted on seismic and the depth on cores recovered from holes transecting...
GLOBAL JOURNAL OF APPLIED, MANAGEMENT AND SOCIAL SCIENCES, 2015
The notion of common good does not just happen. Establishing and maintaining it is the responsibi... more The notion of common good does not just happen. Establishing and maintaining it is the responsibility of everyone. Maintaining the social conditions from which we all benefit requires the cooperative efforts of all citizens. These efforts pay off with the media assuming a frontline responsibility to promote the awareness and shared understanding of common good as well as emphasizing that most social problems grow out of widespread pursuit of individual interest. The study recognizes the fact that we face in the society a choice between where people accept modest sacrifice for common good and a more contentious society where individuals selfishly protect their own benefits. This is where the media come handy as a mechanism to promote and popularize common good. The study reveals that the media being a formidable instrument for social change also serves as the forum in which consideration and promotion of issues of common good take place. Also emerging from the study is the fact the m...
Informasi, 2020
The regulation of broadcast religious programming is a critical challenge the National Broadcasti... more The regulation of broadcast religious programming is a critical challenge the National Broadcasting Commission (NBC) is facing in Nigeria. In Maiduguri, the capital of the north-eastern Nigerian state of Borno where religion forms a core part of the people’s culture, a great deal of Borno Radio Television (BRTV) and Nigerian Television Authority Maiduguri’s (NTA Maiduguri) airtime is allocated to Islamic preaching during the Muslim’s annual Ramadan fasting. However, there is a dearth of research on whether the airtime those broadcast stations allocate to Islamic programming complies with the NBC code on religious programming. This research gap formed the main research question of this study which was conducted during the second quarter of 2019. Primary data were collected using key informant interviews with five personnel from the two broadcast stations and the Maiduguri office of NBC, while secondary data were obtained through the review of official documents. Key findings showed t...
Ore Geology Reviews, 2020
Abstract The Kanawa area, Eastern Nigeria Terrane (ENT), located proximal to Pan-African shear zo... more Abstract The Kanawa area, Eastern Nigeria Terrane (ENT), located proximal to Pan-African shear zone, has U prospects with an average U concentration of ∼0.1 wt.%. Samples taken from the fault breccia, mylonite, cataclasite and ore zone show increasing U contents of 2.2-6.7 ppm, 4-7 ppm, 36-253 ppm, and 165->1000 ppm, respectively. U-Pb dating of magmatic zircons from the granite hosting the U prospect yield 206Pb/238U concordia age of 603 ± 5.9 Ma suggesting Pan-African (Ediacaran) age for the host granite. In contrast, zircon grains from the U-ore zone yield 206Pb/238U concordia age of 228 ± 2 Ma, considered here as the estimated age of U mineralization, an interpretation that need to be supported by additional data. The Pan-African granite hosting Kanawa U mineralization has very low U content (U = 1.0 to 6.7 ppm) and therefore could not have been the main source of the U mineralization. Considering that the Kanawa U ore zone shows broadly similar geochemical signature and yield roughly similar age with its spatially associated Mesozoic rocks in area, we suggest that the U mineralization was probably sourced from the Mesozoic volcanics rocks. Uranium, Zr, V may have been leached out from the Mesozoic volcanic by hydrothermal fluid circulating along the channel ways provided by Pan-African wrench fault. Taken together, our combined major and trace element data in conjunction with previously reported data of U mineralization from western Cameroon allow us re-evaluate the geochemical signatures of Pan-African granite hosting U mineralization in these regions and reassess their U potential in relation to some well-known U deposits elsewhere in the world. It is noteworthy that the Kanawa U mineralization shows broadly similar geochemical feature with the volcanic-related Streltsovskoye-Antei U deposit, Transbaikalia, Russia. The highly evolved Ekomedion granites in Cameroon have high U and F content and exhibit geochemical feature typical of U-fertile granite suggesting that U mineralization Ekomedion area was probably sourced from the granites. In contrast, Pan-African granites from Kitongo have low U and F content and may not have been the primary source of the Kitongo U mineralization. As suggested for Kanawa U mineralization, the Kitongo U mineralization was probably sourced from the Mesozoic rocks in the area. These chains of Mesozoic volcanic and plutonic suites, largely emplaced within Pan-African mega- shear zones, extend from Nigeria in to Cameroon and Niger, and could be linked to other mega shear zones in Egypt and Saudi Arabia where similar U mineralization have been reported. This study, therefore, allows for an initial correlation of U occurrences and provides a framework for further regional investigation.
Asian Journal of Chemistry, 2020
Exploration of the natural product as pharmaceutical drug widely discover continuously for human ... more Exploration of the natural product as pharmaceutical drug widely discover continuously for human life. The unique chemical compounds have been explored from bark stem of Melochia Umbellata (Houtt) Stapf var. degrabrata K. (M. umbellata) which is obtained from South Sulawesi, Indonesia. We discovered two group compounds isolated namely stigmasta-5,22-dien-3-β-ol (1) and stigmasta-5,22-dien-on (2), from n-hexane and chloroform extracts. The chemical structure of compounds 1 and 2 were identified based on IR spectroscopic, 1H NMR and 13C NMR and compared spectra data with data of compounds by other researchers. Compounds 1 and 2 are evaluated of their toxicity activity against shrimp larvae (Artemia salina) shows that the compound 1 shows weak toxicity activities against Artemia salina with LC50 value of 548.48 μg/mL, meanwhile the compound 2 exhibits a high inhibitory by LC50 value of 410.81 μg/mL. Based on this study, we suggest that the compound 2 has good bioactivity compared with ...
Journal of Philosophy, Culture and Religion, 2019
SN Applied Sciences, 2019
Journal of African Earth Sciences, 2019
Abstract The upper Bima Formation in the Northern Benue Trough has been interpreted as a distribu... more Abstract The upper Bima Formation in the Northern Benue Trough has been interpreted as a distributive fluvial system. Previous stratigraphic studies on the Bima Formation were focussed on localized, qualitative, sedimentary facies analysis without regional context or quantitative information about sand-body scale and architecture. This study quantitatively analysed sand-body thickness variations in the upper member of the Bima Formation across the Northern Benue Trough, documented the spatial variations in channel dimensions. Photo-realistic virtual outcrops were generated for four study sites using data acquired with an unmanned aerial vehicle and processed photogrammetrically. Analysis of the virtual outcrops illustrated spatial variation in the thickness of channel infill components, a downstream decrease in proportion of multi-storey channel belt facies association (from 98% to 5%), an increase in floodplain facies association (from 0% to 13%), an increase in the proportion of isolated channel fill facies association (from 2% to 80%) and a slight decrease in average grainsizes of channel fill sandstone. These observations are interpreted to represent evidence of a distributive fluvial system (DFS) or mega-fan with the proximal part of system at Tula, Ture and Tashan Alaji to the medial part at Hinna having an increase in frequency and thickness of the flood plain facies association and abundance of isolated channel fill facies associations. This study demonstrates the regional facies variability of the upper Bima Formation and has provided a basis for comparison with other ancient distributive fluvial system.
Science Forum (Journal of Pure and Applied Sciences), 2019
The Jessu Formation is one of the marine Cretaceous sediments in the Yola Sub-basin of the Northe... more The Jessu Formation is one of the marine Cretaceous sediments in the Yola Sub-basin of the Northern Benue Trough, NE Nigeria. Lithofacies studies was carried out on the Jessu Formation exposed at Dukul and Cham streams outcrops, in order to identify facies, establish facies association and re-construct the paleodepositional environment. Ten (10) facies were identified on the bases of lithology, grain size, sedimentary structures and degree of bioturbation. These facies form four (4) facies associations, namely: the FA-1 (offshore marine), FA-2 (lower shoreface), FA-3 (middle shoreface) and FA-4 (upper shoreface). These facies associations form coarsening upward units from offshore marine to shoreface which suggests a shoreface deposit for the Jessu Formation. The coarsening upward facies succession indicated storm and wave influenced coastal system.
SPE Nigeria Annual International Conference and Exhibition, 2019
The prohibitive costs & risks associated with performing PLT and potentially the isolation of the... more The prohibitive costs & risks associated with performing PLT and potentially the isolation of the water producing zone through WSO in deepwater fields such as Akpo renders these operations economically unattractive. This paper addresses the application of analytical method including the use of 4D monitor results to replace conventional PLT to identify, screen and select viable successful water shut off candidates. Prior to executing water shut-off treatment programs, a combination of 4D seismic interpretation, production history review as well as the collection of completion and reservoir information were thoroughly performed to ensure that the wells are properly selected. Well's diagnostic plot (WOR and WOR′) must be consistent with the type of water coning or channeling problem identified from the 4D time lapse seismic and also the depth of possible mechanical plug must be around or above estimated current oil-water contact (COWC). Two candidate wells having 6-5/8″ SAS Slot 10...
SPE Nigeria Annual International Conference and Exhibition, 2019
Regional studies are known to show major compartmentalization in an oil field, while observations... more Regional studies are known to show major compartmentalization in an oil field, while observations during development and production often highlight local structural connectivity issues that require fault characterization at field-scale to mitigate uncertainty in reserve or stakes. The Akpo field, located in the deep offshore Niger Delta, exemplifies a maturing field where these structural connectivity issues are dominant and play significant roles in field development. Structural discrepancies in the crest and flanks of the anticline result in varying water contacts and overpressure differences, affecting connected volumes and sweep efficiency. Qualitative fault throw analysis, aided by 4-D monitoring results, show that same faults may be sealing and communicating at difference areas, across reservoir fairways in the deep offshore turbiditic channel complexes, delineated as architectural elements. Shale Gouge Ratio (SGR) helps in further constraining the sealing/leaking impact of fa...
SPE Nigeria Annual International Conference and Exhibition, 2019
With increasing complexity of reservoir developments, there is often a marked deviation from the ... more With increasing complexity of reservoir developments, there is often a marked deviation from the field development plan (FDP), thus, requiring complementary developments with infill wells. This paper addresses this necessity whilst using the Akpo field reservoir B as a case study. Our case is an oil-bearing, highly faulted turbidite channel-levees system. The reservoir comprises three different units (Upper, Middle and Lower) with gross interval of about 140 m and good porosity and permeability values. The hydrocarbon-water contact (HWC) varies across fault blocks with little certainty about reservoir connectivity. It was assumed in the initial FDP that two producers located around the top structure would be supported by two injector wells located on the flanks near the HWC. In 2011, the first producer (Akpo-XP) was completed in the three units and equipped with an inflow control valve (ICV). From fluid samples collected and the selective acquisition of dynamic data from these inter...
SPE Nigeria Annual International Conference and Exhibition, 2019
Water injection is one of the key improved recovery techniques used for pressure maintenance and ... more Water injection is one of the key improved recovery techniques used for pressure maintenance and sweeping. Throughout the life of a field, changes in injectivity can have an effect on reservoir pressure management and sweep efficiency which both have a direct impact on production. This study aims to present an original methodology to analyse the performance of water injectors in a deepwater turbidite field and evaluate the evolution of their injectivity over time. An injectivity monitoring tool was developed by incorporating injection flowrate and pressure data with the following analytical techniques: (i) Instantaneous Injectivity Index, (ii) Hearn Plot or Reciprocal Injectivity Index, (iii) Hall Plot, (iv) Derivative Hall Plot and (v) Pressure Transient Analysis. The injectivity monitoring tool was able to capture subtle changes in injectivity and demonstrate the long term trend of stable injectivity in this field, even in situations where only wellhead pressure and injection flow...
SPE Nigeria Annual International Conference and Exhibition, 2019
Gas injection is used as an improved recovery mechanism to provide reservoir pressure maintenance... more Gas injection is used as an improved recovery mechanism to provide reservoir pressure maintenance, oil swelling and sweeping. This mechanism offers a high microscopic recovery comparing to water injection thanks to a lower residual oil saturation to gas. However, its macroscopic recovery tends in general to be smaller due to a lower sweep efficiency - a direct consequence of high gas to oil mobility ratio. The case of Akpo Z represents a success story where gas injection led to a significant increase in the condensate ultimate recovery higher than 70%, as a result of the combination of both high microscopic and macroscopic recoveries. Akpo Z is a light condensate-bearing turbidite reservoir deep offshore Nigeria and has been developed using two gas injectors located at the crest of the structure with four oil producers at the flanks. The key success factors of gas injection in Akpo Z are linked both to a favorable subsurface environment, in particular, a large structure, good horizontal connectivity and a near critical light fluid, but also to appropriate reservoir development choices. These elements are detailed in this paper. This paper also shows the challenges linked to daily reservoir management and monitoring from an operator point of view, in particular, the impact of gas injection availability on condensate production shortfalls and the uncertainties linked to gas production and injection metering. Throughout the field life, several monitoring tools such as Intelligent Well Completion (IWC) and 4D seismic have been leveraged to take appropriate reservoir management decisions that led to a delay in gas and water breakthrough and sustain field condensate potential.
International Journal of Scientific Research in Science, Engineering and Technology, 2019
A field experiment was conducted during the 2016 and 2017 dry seasons at Institute for Agricultur... more A field experiment was conducted during the 2016 and 2017 dry seasons at Institute for Agricultural Research Farm Kadawa and Zobe Irrigation Fields at to study the influence of intra-row spacing, nitrogen fertilizer and time of its application on the performance of extra early maize. The treatments tested consisted of factorial combinations of three levels of nitrogen (0, 60, and 120 kg/ha), three intra row spacing (15 cm, 25 cm, and 35 cm) and three different times of fertilizer application (at planting+4WAS, 2WAS+4WAS and 2WAS+4WAS+6WAS). The treatments were laid in a split-plot design in four replications with the combination of nitrogen levels and its times of application assigned to the main plot, while intra row spacing assigned to sub-plot. The results of the investigation showed that 25 cm and 35 cm intra row spacing produced the tallest plants, higher number of leaves per plant and number of grains per row at Dutsinma. At Kadawa most of the parameters showed no significant ...
Traektoriâ nauki, Dec 31, 2021
امروزه تعداد روزافزونی از شرکت‌ها و سازمان‌ها عملیات خود را با استفاده از شاخص‌های اقتصادی، اجتما... more امروزه تعداد روزافزونی از شرکت‌ها و سازمان‌ها عملیات خود را با استفاده از شاخص‌های اقتصادی، اجتماعی، محیط‌زیستی و حاکمیت شرکتی، پایدار کرده و با استفاده از گزارشگری پایداری، عملکرد خود را اندازه‌گیری و اطلاع‌رسانی نمایند. هدف اصلی این پژوهش، بررسی نقش گزارشگری پایداری بر مدیریت سود باانگیزه دستیابی به آستانههای سود در شرکت‌های پذیرفته‌شده در بورس اوراق بهادار تهران است. در این پژوهش اطلاعات مربوط به 1098 سال - شرکت طی سال‌های 1390 تا 1395 گردآوری‌شده است. شاخص گزارشگری پایداری با بررسی ابعاد مختلف گزارشگری اقتصادی، اجتماعی، محیط‌زیستی و حاکمیت شرکتی اندازه‌گیری شده و روش آماری پژوهش معادلات ساختاری و مدل سازنده بوده است. نتایج آزمون فرضیه‌ها نشان می‌دهند بین شاخص پایداری با مدیریت سود باانگیزه دستیابی به آستانههای سود اجتناب از کاهش سود و اجتناب از سود غیرمنتظره منفی رابطه منفی و معنی‌داری وجود دارد. نتایج کلی حاصل از تحقیق بیانگر آن است که با افزایش شاخص پایداری، مدیرانی که در معرض اجتناب از کاهش سود و اجتناب از سود غیرمنتظره منفی قرار می‌گیرند با احتمال کمتری اقدام به مدیریت سود...
The general patriarchal character of the media aligns with the logic of commercialism which prior... more The general patriarchal character of the media aligns with the logic of commercialism which prioritizes profit and restricts the diversity of news content in favour of those who have the means of purchase. It explains why there is a male preponderance in media ownership, staffing and content consumption especially in Nigeria where women have access to, and appear in, the news far fewer times than men. This provokes a question: Does low content consumption by women influence the way media report them? This paper unravels these two variables within a political context. Content assessment and respondents’ rating of Nigeria’s dominant print media (1999-2003) shows a robust political reporting but with a gender differential that is heavily skewed towards men. Focus group evaluations of the situation show a connection between women’s low visibility in the news and inconsequential access to content. One evaluation attributes the scenario to unconscious reporting! That brings to the fore jo...
Journal of Family Medicine and Primary Care, 2018
Canterbury basin covers an approximate area of 40,000 km2, Canterbury basin is largely an offshor... more Canterbury basin covers an approximate area of 40,000 km2, Canterbury basin is largely an offshore basin extending slightly onshore southward across Canterbury plains and to the Southern Alps. This work aimed to correlates seismic sequences boundaries earlier interpreted with sedimentary sequence surfaces observed in cores recovered from the four sites drilled across the shelf by expedition 317. This work utilises well data obtained from Integrated Ocean Drilling Program (IODP) expedition 317. The expedition which targeted stratigraphic seismic sequences earlier interpreted from the seismic data acquired on the eastern margin of the south island of New Zealand (offshore Canterbury). Three synthetic seismograms were created from well U1351B, U1353C and U1352B which both contain sets of sonic and density logs at variable length, this is to provide a direct means of comparison between the sequence boundaries interpreted on seismic and the depth on cores recovered from holes transecting...
GLOBAL JOURNAL OF APPLIED, MANAGEMENT AND SOCIAL SCIENCES, 2015
The notion of common good does not just happen. Establishing and maintaining it is the responsibi... more The notion of common good does not just happen. Establishing and maintaining it is the responsibility of everyone. Maintaining the social conditions from which we all benefit requires the cooperative efforts of all citizens. These efforts pay off with the media assuming a frontline responsibility to promote the awareness and shared understanding of common good as well as emphasizing that most social problems grow out of widespread pursuit of individual interest. The study recognizes the fact that we face in the society a choice between where people accept modest sacrifice for common good and a more contentious society where individuals selfishly protect their own benefits. This is where the media come handy as a mechanism to promote and popularize common good. The study reveals that the media being a formidable instrument for social change also serves as the forum in which consideration and promotion of issues of common good take place. Also emerging from the study is the fact the m...
Informasi, 2020
The regulation of broadcast religious programming is a critical challenge the National Broadcasti... more The regulation of broadcast religious programming is a critical challenge the National Broadcasting Commission (NBC) is facing in Nigeria. In Maiduguri, the capital of the north-eastern Nigerian state of Borno where religion forms a core part of the people’s culture, a great deal of Borno Radio Television (BRTV) and Nigerian Television Authority Maiduguri’s (NTA Maiduguri) airtime is allocated to Islamic preaching during the Muslim’s annual Ramadan fasting. However, there is a dearth of research on whether the airtime those broadcast stations allocate to Islamic programming complies with the NBC code on religious programming. This research gap formed the main research question of this study which was conducted during the second quarter of 2019. Primary data were collected using key informant interviews with five personnel from the two broadcast stations and the Maiduguri office of NBC, while secondary data were obtained through the review of official documents. Key findings showed t...
Ore Geology Reviews, 2020
Abstract The Kanawa area, Eastern Nigeria Terrane (ENT), located proximal to Pan-African shear zo... more Abstract The Kanawa area, Eastern Nigeria Terrane (ENT), located proximal to Pan-African shear zone, has U prospects with an average U concentration of ∼0.1 wt.%. Samples taken from the fault breccia, mylonite, cataclasite and ore zone show increasing U contents of 2.2-6.7 ppm, 4-7 ppm, 36-253 ppm, and 165->1000 ppm, respectively. U-Pb dating of magmatic zircons from the granite hosting the U prospect yield 206Pb/238U concordia age of 603 ± 5.9 Ma suggesting Pan-African (Ediacaran) age for the host granite. In contrast, zircon grains from the U-ore zone yield 206Pb/238U concordia age of 228 ± 2 Ma, considered here as the estimated age of U mineralization, an interpretation that need to be supported by additional data. The Pan-African granite hosting Kanawa U mineralization has very low U content (U = 1.0 to 6.7 ppm) and therefore could not have been the main source of the U mineralization. Considering that the Kanawa U ore zone shows broadly similar geochemical signature and yield roughly similar age with its spatially associated Mesozoic rocks in area, we suggest that the U mineralization was probably sourced from the Mesozoic volcanics rocks. Uranium, Zr, V may have been leached out from the Mesozoic volcanic by hydrothermal fluid circulating along the channel ways provided by Pan-African wrench fault. Taken together, our combined major and trace element data in conjunction with previously reported data of U mineralization from western Cameroon allow us re-evaluate the geochemical signatures of Pan-African granite hosting U mineralization in these regions and reassess their U potential in relation to some well-known U deposits elsewhere in the world. It is noteworthy that the Kanawa U mineralization shows broadly similar geochemical feature with the volcanic-related Streltsovskoye-Antei U deposit, Transbaikalia, Russia. The highly evolved Ekomedion granites in Cameroon have high U and F content and exhibit geochemical feature typical of U-fertile granite suggesting that U mineralization Ekomedion area was probably sourced from the granites. In contrast, Pan-African granites from Kitongo have low U and F content and may not have been the primary source of the Kitongo U mineralization. As suggested for Kanawa U mineralization, the Kitongo U mineralization was probably sourced from the Mesozoic rocks in the area. These chains of Mesozoic volcanic and plutonic suites, largely emplaced within Pan-African mega- shear zones, extend from Nigeria in to Cameroon and Niger, and could be linked to other mega shear zones in Egypt and Saudi Arabia where similar U mineralization have been reported. This study, therefore, allows for an initial correlation of U occurrences and provides a framework for further regional investigation.
Asian Journal of Chemistry, 2020
Exploration of the natural product as pharmaceutical drug widely discover continuously for human ... more Exploration of the natural product as pharmaceutical drug widely discover continuously for human life. The unique chemical compounds have been explored from bark stem of Melochia Umbellata (Houtt) Stapf var. degrabrata K. (M. umbellata) which is obtained from South Sulawesi, Indonesia. We discovered two group compounds isolated namely stigmasta-5,22-dien-3-β-ol (1) and stigmasta-5,22-dien-on (2), from n-hexane and chloroform extracts. The chemical structure of compounds 1 and 2 were identified based on IR spectroscopic, 1H NMR and 13C NMR and compared spectra data with data of compounds by other researchers. Compounds 1 and 2 are evaluated of their toxicity activity against shrimp larvae (Artemia salina) shows that the compound 1 shows weak toxicity activities against Artemia salina with LC50 value of 548.48 μg/mL, meanwhile the compound 2 exhibits a high inhibitory by LC50 value of 410.81 μg/mL. Based on this study, we suggest that the compound 2 has good bioactivity compared with ...
Journal of Philosophy, Culture and Religion, 2019
SN Applied Sciences, 2019
Journal of African Earth Sciences, 2019
Abstract The upper Bima Formation in the Northern Benue Trough has been interpreted as a distribu... more Abstract The upper Bima Formation in the Northern Benue Trough has been interpreted as a distributive fluvial system. Previous stratigraphic studies on the Bima Formation were focussed on localized, qualitative, sedimentary facies analysis without regional context or quantitative information about sand-body scale and architecture. This study quantitatively analysed sand-body thickness variations in the upper member of the Bima Formation across the Northern Benue Trough, documented the spatial variations in channel dimensions. Photo-realistic virtual outcrops were generated for four study sites using data acquired with an unmanned aerial vehicle and processed photogrammetrically. Analysis of the virtual outcrops illustrated spatial variation in the thickness of channel infill components, a downstream decrease in proportion of multi-storey channel belt facies association (from 98% to 5%), an increase in floodplain facies association (from 0% to 13%), an increase in the proportion of isolated channel fill facies association (from 2% to 80%) and a slight decrease in average grainsizes of channel fill sandstone. These observations are interpreted to represent evidence of a distributive fluvial system (DFS) or mega-fan with the proximal part of system at Tula, Ture and Tashan Alaji to the medial part at Hinna having an increase in frequency and thickness of the flood plain facies association and abundance of isolated channel fill facies associations. This study demonstrates the regional facies variability of the upper Bima Formation and has provided a basis for comparison with other ancient distributive fluvial system.
Science Forum (Journal of Pure and Applied Sciences), 2019
The Jessu Formation is one of the marine Cretaceous sediments in the Yola Sub-basin of the Northe... more The Jessu Formation is one of the marine Cretaceous sediments in the Yola Sub-basin of the Northern Benue Trough, NE Nigeria. Lithofacies studies was carried out on the Jessu Formation exposed at Dukul and Cham streams outcrops, in order to identify facies, establish facies association and re-construct the paleodepositional environment. Ten (10) facies were identified on the bases of lithology, grain size, sedimentary structures and degree of bioturbation. These facies form four (4) facies associations, namely: the FA-1 (offshore marine), FA-2 (lower shoreface), FA-3 (middle shoreface) and FA-4 (upper shoreface). These facies associations form coarsening upward units from offshore marine to shoreface which suggests a shoreface deposit for the Jessu Formation. The coarsening upward facies succession indicated storm and wave influenced coastal system.
SPE Nigeria Annual International Conference and Exhibition, 2019
The prohibitive costs & risks associated with performing PLT and potentially the isolation of the... more The prohibitive costs & risks associated with performing PLT and potentially the isolation of the water producing zone through WSO in deepwater fields such as Akpo renders these operations economically unattractive. This paper addresses the application of analytical method including the use of 4D monitor results to replace conventional PLT to identify, screen and select viable successful water shut off candidates. Prior to executing water shut-off treatment programs, a combination of 4D seismic interpretation, production history review as well as the collection of completion and reservoir information were thoroughly performed to ensure that the wells are properly selected. Well's diagnostic plot (WOR and WOR′) must be consistent with the type of water coning or channeling problem identified from the 4D time lapse seismic and also the depth of possible mechanical plug must be around or above estimated current oil-water contact (COWC). Two candidate wells having 6-5/8″ SAS Slot 10...
SPE Nigeria Annual International Conference and Exhibition, 2019
Regional studies are known to show major compartmentalization in an oil field, while observations... more Regional studies are known to show major compartmentalization in an oil field, while observations during development and production often highlight local structural connectivity issues that require fault characterization at field-scale to mitigate uncertainty in reserve or stakes. The Akpo field, located in the deep offshore Niger Delta, exemplifies a maturing field where these structural connectivity issues are dominant and play significant roles in field development. Structural discrepancies in the crest and flanks of the anticline result in varying water contacts and overpressure differences, affecting connected volumes and sweep efficiency. Qualitative fault throw analysis, aided by 4-D monitoring results, show that same faults may be sealing and communicating at difference areas, across reservoir fairways in the deep offshore turbiditic channel complexes, delineated as architectural elements. Shale Gouge Ratio (SGR) helps in further constraining the sealing/leaking impact of fa...
SPE Nigeria Annual International Conference and Exhibition, 2019
With increasing complexity of reservoir developments, there is often a marked deviation from the ... more With increasing complexity of reservoir developments, there is often a marked deviation from the field development plan (FDP), thus, requiring complementary developments with infill wells. This paper addresses this necessity whilst using the Akpo field reservoir B as a case study. Our case is an oil-bearing, highly faulted turbidite channel-levees system. The reservoir comprises three different units (Upper, Middle and Lower) with gross interval of about 140 m and good porosity and permeability values. The hydrocarbon-water contact (HWC) varies across fault blocks with little certainty about reservoir connectivity. It was assumed in the initial FDP that two producers located around the top structure would be supported by two injector wells located on the flanks near the HWC. In 2011, the first producer (Akpo-XP) was completed in the three units and equipped with an inflow control valve (ICV). From fluid samples collected and the selective acquisition of dynamic data from these inter...
SPE Nigeria Annual International Conference and Exhibition, 2019
Water injection is one of the key improved recovery techniques used for pressure maintenance and ... more Water injection is one of the key improved recovery techniques used for pressure maintenance and sweeping. Throughout the life of a field, changes in injectivity can have an effect on reservoir pressure management and sweep efficiency which both have a direct impact on production. This study aims to present an original methodology to analyse the performance of water injectors in a deepwater turbidite field and evaluate the evolution of their injectivity over time. An injectivity monitoring tool was developed by incorporating injection flowrate and pressure data with the following analytical techniques: (i) Instantaneous Injectivity Index, (ii) Hearn Plot or Reciprocal Injectivity Index, (iii) Hall Plot, (iv) Derivative Hall Plot and (v) Pressure Transient Analysis. The injectivity monitoring tool was able to capture subtle changes in injectivity and demonstrate the long term trend of stable injectivity in this field, even in situations where only wellhead pressure and injection flow...
SPE Nigeria Annual International Conference and Exhibition, 2019
Gas injection is used as an improved recovery mechanism to provide reservoir pressure maintenance... more Gas injection is used as an improved recovery mechanism to provide reservoir pressure maintenance, oil swelling and sweeping. This mechanism offers a high microscopic recovery comparing to water injection thanks to a lower residual oil saturation to gas. However, its macroscopic recovery tends in general to be smaller due to a lower sweep efficiency - a direct consequence of high gas to oil mobility ratio. The case of Akpo Z represents a success story where gas injection led to a significant increase in the condensate ultimate recovery higher than 70%, as a result of the combination of both high microscopic and macroscopic recoveries. Akpo Z is a light condensate-bearing turbidite reservoir deep offshore Nigeria and has been developed using two gas injectors located at the crest of the structure with four oil producers at the flanks. The key success factors of gas injection in Akpo Z are linked both to a favorable subsurface environment, in particular, a large structure, good horizontal connectivity and a near critical light fluid, but also to appropriate reservoir development choices. These elements are detailed in this paper. This paper also shows the challenges linked to daily reservoir management and monitoring from an operator point of view, in particular, the impact of gas injection availability on condensate production shortfalls and the uncertainties linked to gas production and injection metering. Throughout the field life, several monitoring tools such as Intelligent Well Completion (IWC) and 4D seismic have been leveraged to take appropriate reservoir management decisions that led to a delay in gas and water breakthrough and sustain field condensate potential.
International Journal of Scientific Research in Science, Engineering and Technology, 2019
A field experiment was conducted during the 2016 and 2017 dry seasons at Institute for Agricultur... more A field experiment was conducted during the 2016 and 2017 dry seasons at Institute for Agricultural Research Farm Kadawa and Zobe Irrigation Fields at to study the influence of intra-row spacing, nitrogen fertilizer and time of its application on the performance of extra early maize. The treatments tested consisted of factorial combinations of three levels of nitrogen (0, 60, and 120 kg/ha), three intra row spacing (15 cm, 25 cm, and 35 cm) and three different times of fertilizer application (at planting+4WAS, 2WAS+4WAS and 2WAS+4WAS+6WAS). The treatments were laid in a split-plot design in four replications with the combination of nitrogen levels and its times of application assigned to the main plot, while intra row spacing assigned to sub-plot. The results of the investigation showed that 25 cm and 35 cm intra row spacing produced the tallest plants, higher number of leaves per plant and number of grains per row at Dutsinma. At Kadawa most of the parameters showed no significant ...