Bulk geochemical characteristics and carbon isotope composition of oils from the Sayhut sub-basin in the Gulf of Aden with emphasis on organic matter input, age and maturity
The Sayhut sub-basin is undergoing hydrocarbon exploration province in the Gulf of Aden, South Yemen. In this study, geochemical analyses were performed on three oil samples from two exploration wells in the Sayhut sub-basin. The results were used to describe the source organic matter input, age and...
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Egyptian Petroleum Research Institute
2018-09-01
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| Series: | Egyptian Journal of Petroleum |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S111006211730048X |
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| author | Mohammed Hail Hakimi Adel M. Al-Matary Abdulghani F. Ahmed |
| author_facet | Mohammed Hail Hakimi Adel M. Al-Matary Abdulghani F. Ahmed |
| author_sort | Mohammed Hail Hakimi |
| collection | DOAJ |
| description | The Sayhut sub-basin is undergoing hydrocarbon exploration province in the Gulf of Aden, South Yemen. In this study, geochemical analyses were performed on three oil samples from two exploration wells in the Sayhut sub-basin. The results were used to describe the source organic matter input, age and maturity and to correlate between crude oils from different pay zones.The high saturated hydrocarbon values of more than 70% indicate that the analysed oils are normal crude oils and not degraded oils. This is supported by a complete suite of their normal alkanes and acyclic isoprenoids. The hydrocarbon distributions of normal alkane and isoprenoid with bulk carbon isotope data also suggest that the analysed oils are grouped into two genetic families and were generated from marine-source rock. The family A presents by one oil sample representing Harshiyat reservoir rock and characterized by relatively high Ph/Ph ratio > 2 and δ13C values of their saturated and aromatic hydrocarbon fractions range from −26.1‰ to −24.8‰. This oil family was derived from mixed organic matter with high contribution of a terrigenous organic matter input. The family A was deposited under suboxic conditions during the Late Cretaceous age. The family B presents by two oil samples representing Ghaydah and Habshiyah reservoir rocks and characterized by relatively low Ph/Ph ratio < 2 and carbon isotope less than −23 for their saturated and aromatic hydrocarbon fractions. These oils were generated from source rock containing high contributions of marine organic matter (e.g., algal and microbial) with minor amount of land plant source inputs that was deposited in more reducing conditions. The family B oils are consistent with those of the Paleogene Umm Er Radhuma source rock.The hydrocarbon distribution and oil composition data also indicate that the analysed oils were generated from mature source rocks with a peak oil-window maturity. Keywords: Crude oil, Carbon isotope, Depositional environment, Source inputs, Gulf of Aden, Yemen |
| format | Article |
| id | doaj-art-daae6b4a0870448c8f8f1cd54128be0d |
| institution | DOAJ |
| issn | 1110-0621 |
| language | English |
| publishDate | 2018-09-01 |
| publisher | Egyptian Petroleum Research Institute |
| record_format | Article |
| series | Egyptian Journal of Petroleum |
| spelling | doaj-art-daae6b4a0870448c8f8f1cd54128be0d2025-08-20T03:04:40ZengEgyptian Petroleum Research InstituteEgyptian Journal of Petroleum1110-06212018-09-0127336137010.1016/j.ejpe.2017.06.002Bulk geochemical characteristics and carbon isotope composition of oils from the Sayhut sub-basin in the Gulf of Aden with emphasis on organic matter input, age and maturityMohammed Hail Hakimi0Adel M. Al-Matary1Abdulghani F. Ahmed2Geology Department, Faculty of Applied Science, Taiz University, 6803 Taiz, Yemen; Corresponding author.Department of Earth and Environmental Sciences, Sana’a University, Sana’a, YemenGeology Department, Faculty of Applied Science, Taiz University, 6803 Taiz, YemenThe Sayhut sub-basin is undergoing hydrocarbon exploration province in the Gulf of Aden, South Yemen. In this study, geochemical analyses were performed on three oil samples from two exploration wells in the Sayhut sub-basin. The results were used to describe the source organic matter input, age and maturity and to correlate between crude oils from different pay zones.The high saturated hydrocarbon values of more than 70% indicate that the analysed oils are normal crude oils and not degraded oils. This is supported by a complete suite of their normal alkanes and acyclic isoprenoids. The hydrocarbon distributions of normal alkane and isoprenoid with bulk carbon isotope data also suggest that the analysed oils are grouped into two genetic families and were generated from marine-source rock. The family A presents by one oil sample representing Harshiyat reservoir rock and characterized by relatively high Ph/Ph ratio > 2 and δ13C values of their saturated and aromatic hydrocarbon fractions range from −26.1‰ to −24.8‰. This oil family was derived from mixed organic matter with high contribution of a terrigenous organic matter input. The family A was deposited under suboxic conditions during the Late Cretaceous age. The family B presents by two oil samples representing Ghaydah and Habshiyah reservoir rocks and characterized by relatively low Ph/Ph ratio < 2 and carbon isotope less than −23 for their saturated and aromatic hydrocarbon fractions. These oils were generated from source rock containing high contributions of marine organic matter (e.g., algal and microbial) with minor amount of land plant source inputs that was deposited in more reducing conditions. The family B oils are consistent with those of the Paleogene Umm Er Radhuma source rock.The hydrocarbon distribution and oil composition data also indicate that the analysed oils were generated from mature source rocks with a peak oil-window maturity. Keywords: Crude oil, Carbon isotope, Depositional environment, Source inputs, Gulf of Aden, Yemenhttp://www.sciencedirect.com/science/article/pii/S111006211730048X |
| spellingShingle | Mohammed Hail Hakimi Adel M. Al-Matary Abdulghani F. Ahmed Bulk geochemical characteristics and carbon isotope composition of oils from the Sayhut sub-basin in the Gulf of Aden with emphasis on organic matter input, age and maturity Egyptian Journal of Petroleum |
| title | Bulk geochemical characteristics and carbon isotope composition of oils from the Sayhut sub-basin in the Gulf of Aden with emphasis on organic matter input, age and maturity |
| title_full | Bulk geochemical characteristics and carbon isotope composition of oils from the Sayhut sub-basin in the Gulf of Aden with emphasis on organic matter input, age and maturity |
| title_fullStr | Bulk geochemical characteristics and carbon isotope composition of oils from the Sayhut sub-basin in the Gulf of Aden with emphasis on organic matter input, age and maturity |
| title_full_unstemmed | Bulk geochemical characteristics and carbon isotope composition of oils from the Sayhut sub-basin in the Gulf of Aden with emphasis on organic matter input, age and maturity |
| title_short | Bulk geochemical characteristics and carbon isotope composition of oils from the Sayhut sub-basin in the Gulf of Aden with emphasis on organic matter input, age and maturity |
| title_sort | bulk geochemical characteristics and carbon isotope composition of oils from the sayhut sub basin in the gulf of aden with emphasis on organic matter input age and maturity |
| url | http://www.sciencedirect.com/science/article/pii/S111006211730048X |
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