Fingerprinting of Some Egyptian Crude Oils via GC-MS in Relations to Their Biomarkers
Eman Saied Abdullah;
Abstract
This thesis aims to fingerprint several crude oils from different Egyptian petroleum basins via their biomarker distribution. Chemical fingerprinting has dual benefits in both geochemical and environmental studies. For the petroleum geochemists, the comparable chemical fingerprinting gained from oil biomarker is an exploration and assessment tool that provides information on hydrocarbon source faces, age, kerogen quality, depositional environments and thermal maturation history.
For environmental scientists, biomarkers fingerprinting is an important component of oil spill investigations and site assessments and often supports determining responsibility for the pollution.
The thesis describes a comprehensive geochemical study on seventeen crude oils from both Gulf of Suez and Western Desert using gas chromatography (GC) and gas chromatography mass spectrometry (GC-MS). Chapter I describes a brief introduction of terms, chemistry and chemical structure, genesis and fingerprints of biomarkers. Details of the experimental procedures and techniques have been described in Chapter II.
Summary
ii
In Chapter III, the results of bulk geochemical analysis (API, Sulfur content, Ni and V contents), isoprenoids and n-alkanes distributions and hopanes and steranes biomarkers distributions of seventeen crude oils are deeply discussed. It could be briefly summarized in:
Bulk geochemical properties
Based on the API gravity, total sulfur content and metals contents (mainly nickel and vanadium) of the studied oils, initial genetic information could be provided. The highest API gravity and lower sulfur and metal contents were observed for Fagure basin crude oils from western desert. However, the lowest API gravity and higher sulfur and metal contents were observed for off shore samples (S3 and S4) from central province of Gulf of Suez basin.
Isoprenoids and n-alkanes distributions
The relative abundances of certain n-alkanes are commonly used to deduce the source of organic matter. The predominance of C27, C29 and C31 n-alkanes has been linked with land plant source while those of C15, C17 and C19 n-alkanes are associated with algal input of organic. For example, Faghure basin samples show the predominance of C27, C29 and C31 n-alkanes while Gulf of Suez crude oils show the predominance of light C15, C17 and C19 n-alkanes.
Summary
For environmental scientists, biomarkers fingerprinting is an important component of oil spill investigations and site assessments and often supports determining responsibility for the pollution.
The thesis describes a comprehensive geochemical study on seventeen crude oils from both Gulf of Suez and Western Desert using gas chromatography (GC) and gas chromatography mass spectrometry (GC-MS). Chapter I describes a brief introduction of terms, chemistry and chemical structure, genesis and fingerprints of biomarkers. Details of the experimental procedures and techniques have been described in Chapter II.
Summary
ii
In Chapter III, the results of bulk geochemical analysis (API, Sulfur content, Ni and V contents), isoprenoids and n-alkanes distributions and hopanes and steranes biomarkers distributions of seventeen crude oils are deeply discussed. It could be briefly summarized in:
Bulk geochemical properties
Based on the API gravity, total sulfur content and metals contents (mainly nickel and vanadium) of the studied oils, initial genetic information could be provided. The highest API gravity and lower sulfur and metal contents were observed for Fagure basin crude oils from western desert. However, the lowest API gravity and higher sulfur and metal contents were observed for off shore samples (S3 and S4) from central province of Gulf of Suez basin.
Isoprenoids and n-alkanes distributions
The relative abundances of certain n-alkanes are commonly used to deduce the source of organic matter. The predominance of C27, C29 and C31 n-alkanes has been linked with land plant source while those of C15, C17 and C19 n-alkanes are associated with algal input of organic. For example, Faghure basin samples show the predominance of C27, C29 and C31 n-alkanes while Gulf of Suez crude oils show the predominance of light C15, C17 and C19 n-alkanes.
Summary
Other data
| Title | Fingerprinting of Some Egyptian Crude Oils via GC-MS in Relations to Their Biomarkers | Other Titles | تحديد بصمة بعض الزيوت البتروليه المصريه باستخدام تقنية كروماتوجافيا الغاز الموصل بكاشف مطياف الكتله و علاقتها بالدلائل البيولوجيه | Authors | Eman Saied Abdullah | Issue Date | 2017 |
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