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Diagenesis and its controls on reservoir quality of the Tambar oil field, Norwegian North Sea

Energy Geoscience 2021年第1期2卷 10-31页

作者： Mohammed bukar Richard H.Worden shettima bukar Philip Shell Department of Earth and Ocean Sciences University of LiverpoolLiverpoolL693GPUK Department of Geology University of MaiduguriNigeria Saudi Aramco Al-DhahranEastern RegionSaudi Arabia

A study of the diagenetic evolution of the Late Jurassic sandstones of the shallow marine facies in the Tambar oil field,Norwegian North Sea was carried out to understand its controls on reservoir *** samples and a set of wireline logs obtained from three wells were used to carry out petrographic studies including light optics and scanning electron microscopy,well log analysis,fluid inclusions,X-ray diffraction(XRD)for whole rock samples,clay mineral extracts and stable *** Tambar reservoir sandstones range mainly from siltstone to fine-grained sandstones,exclusively arkoses cemented mainly by microcrystalline quartz,euhedral quartz overgrowth,dolomite cement,illite and *** diagenetic/eodigenetic minerals include pyrite,calcite,and microcrystalline quartz and late diagenetic/mesodiagenetic minerals include quartz overgrowth,dolomite,illite and *** d18O values of dolomite cement in the Tambar sandstone reservoir range from11.77‰to3.57‰PDB,while the d13C values of the dolomite cement are from5.07‰to1.12‰*** temperature for fluid inclusions trapped in authigenic quartz fall between 130℃ and 169℃.The reservoir quality is controlled mainly by early formed grain-coating microcrystalline quartz that precipitated from the dissolution of sponge spicules which significantly inhibits quartz overgrowth *** emplacement do not show significant control on reservoir quality because considerable quartz cementation has taken place before the onset of major oil *** the coarse-grained sands show a correlation between quartz cement volume and water ***,the interpreted temperature for dolomite cementation is significantly higher for water leg-suggested effect of oil emplacement on the late ***-standing these controls on the reservoir quality will enhance the exploration strategy for the Tambar oil field.

关键词： Diagenesis Oil-inhibition Microquartz-inhibition Anomalous porosity Permeability

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Seroprevalence of and Risk Factors for Cytomegalovirus among HIV-Infected Patients at University of Maiduguri Teaching Hospital, Nigeria

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Open Journal of Immunology 2014年第2期4卷 54-59页

作者： Ibrahim Musa Kida Ballah Akawu Denue bukar Bakki Baba Goni Waru Mohammed Abdullahi Talle Ibrahim Ummate Salisu Aliyu Kwayabura Ibrahim shettima Kuburi Haruna Yusuph Department of Medicine College of Medical Sciences University of Maiduguri Maiduguri Nigeria Department of Obstetrics and Gynaecology College of Medical Sciences University of Maiduguri Maiduguri Nigeria.

Although the distribution of cytomegalovirus (CMV) infection has a wide regional variation, it is more common in Africa and Asia with high prevalence approaching 100% in some communities. CMV is a frequent opportunistic infection and major cause of morbidity and mortality among HIV patients with severe immunosuppression. It can be contracted from body fluid, including saliva, urine, blood, cervical secretions, and semen. CMV seropositivity is considered the best laboratory measure of past infection. We determined the prevalence of CMV and the risk factors associated with its acquisition in a population of HIV positive patients. Anti-CMV IgG seroprevalence was 100% among HIV infected subjects and 98.6% among controls. Having multiple sexual partners and traditional practices were identified as risk factors associated with risk of contracting CMV infection.

关键词： CMV Cytomegalovirus HIV Human Immunodeficiency Virus AIDS Acquired Immunodeficiency Syndrome IgG Immunoglobulin

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