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Source rock geochemistry of central and northwestern Niger Delta: Inference from aromatic hydrocarbons content

能源地球科学(英文) 2023年第3期4卷 9-17页

作者： Akinsehinwa Akinlua Olugbemiga Raphael Dada fuad oluseyi usman Solomon Adeniyi Adekola Fossil Fuels and Environmental Geochemistry Department of ChemistryObafemi Awolowo UniversityIle-IfeNigeria Department of Geology Obafemi Awolowo UniversityIle-IfeNigeria

The influence of origin, depositional environment and thermal maturity of organic matter on the occurrence of aromatic hydrocarbons in source rocks from the central and northwestern Niger Delta was investigated. Eighty two source rock samples from four oil wells in the central and northwestern Niger Delta were analyzed for the aromatic hydrocarbon content using gas chromatography-mass spectrometry (GC-MS). The results of analysis of aromatic hydrocarbon fractions of the source rock extracts show the presence of many classes of aromatic hydrocarbons, which include naphthalenes, phenanthrenes, biphenyls, dibenzothiophenes and fluorenes. Trimethylnaphthalene (TMN) is the most abundant among the naphthalenes while dimethylphenanthrene (DMP) is the most abundant among the phenanthrenes. Among the biphenyls, 3-methylbiphenyl (3 MB) is the most abundant while 4-methyldibenzothiophene (4MDBT) is the most abundant among the dibenzothiphenes. Only two fluorenes were detected, and fluorene is more in abundance than 1-methylfluorene (1 MF). Depositional environment indicators of aromatic hydrocarbon organic matter reveal that the organic materials in the source rocks in these wells were deposited in marine-to-swamp depositional environments under reducing to suboxic conditions. Thermal maturity indicators calculated from the abundance of the aromatic hydrocarbons indicate that the source rock samples are thermally mature. Most of the source rocks are at the peak of oil window while a few at the early oil window. Source rocks from wells GB, OP and OT in the central Niger Delta are thermally more mature than those from well AW in the northwestern Niger Delta.

关键词： Source rock Aromatic hydrocarbon Thermal maturity Depositi onal envir onment Niger Delta

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Determinants of adoption of multiple sustainable agricultural practices among smallholder farmers in Nigeria

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International Soil and Water Conservation Research 2021年第2期9卷 241-248页

作者： Zainab Oyetunde-usman Kehinde oluseyi Olagunju Oyinlola Rafiat Ogunpaimo Natural Resources Institute University of GreenwichChatham Maritime ME44TBUK Economics Research Branch Agri-Food and Biosciences Institute18a Newforge Lane BT95PXUK Rural Economy&Development Programme TeagascMellows CampusAthenryCo.GalwayH65 R718Ireland

Despite the important roles of Sustainable Agricultural Practices(SAPs)in improving productivity,welfare,and food security of farming households,the adoption rates of SAPs have been perceived to be generally low,especially in developing *** cross-sectional data collected from the 2015 Nigeria General Household Survey,this study examines the factors influencing the adoption of multiple SAPs,while also considering the drivers of the intensity of adoption of these *** methods of data analysis are based on the Multivariate probit and the Ordered probit *** SAPs considered include improved seeds,inorganic fertilizer,mixed-cropping techniques,and organic *** empirical results show that farmers’adoption of different SAPs and their intensity of use depend significantly on factors such as the age of household head,gender,education,household size,access to extension services,and household wealth *** findings imply that policymakers and agricultural development agencies should seek to maintain or increase household asset bases,and encourage both formal and informal training programme among farming households to facilitate the adoption of SAPs.

关键词： Sustainable land management Adoption intensity Multivariate probit Ordered probit Developing countries

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