TY  - JOUR
AU  - Saheed, Ramadan Musbah M.
AU  - Šolević Knudsen, Tatjana
AU  - Faraj, Musbah Abduljalil M.
AU  - Nytoft, Hans Peter
AU  - Jovančićević, Branimir
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5651
AB  - Crude oil samples from the Sharara-C oil field (Concession NC-115, Murzuq Basin, SW Libya) were analysed by organic geochemical methods in order to infer the geochemical characteristics of their respective source rocks. Aromatic hydrocarbons were analysed by gas chromatography – mass spectrometry (GC-MS), and gas chromatography – tandem mass spectrometry (GC-MS-MS) was used to analyse saturated biomarkers. The Sharara-C oils are interpreted to have been generated by marine shales containing mixed terrigenous and marine organic materials deposited in an intermediate (suboxic) environment. Age-specific biomarker ratios indicated that the oils are older than Cretaceous, and maturation-related parameters pointed to their high thermal maturity. Consistent with previous studies, source rocks are inferred to be “hot” shales in the Lower Silurian Tanezzuft Formation. Almost all the parameter ratios calculated varied over a very narrow range, indicating that the investigated oils were compositionally similar. The only significant difference that was noted concerned the sterane/hopane ratios whose variation suggested that there was some variability in the composition of the source organic material. The organic geochemical parameters determined for the Sharara-C crude oils were compared with published data on other crude oils from Concession NC-115. Almost all the parameters agreed well with previously published data on oils from this part of the Murzuq Basin. The greatest deviation concerned the values of some of the maturity parameters. This tended to confirm the conclusions of previous studies concerning the presence of a number of distinct oil families and sub-families in the Sharara oil field area which are genetically related but which have different maturities. © 2023 The Authors. Journal of Petroleum Geology.
PB  - John Wiley and Sons Inc
T2  - Journal of Petroleum Geology
T1  - Geochemical characteristics of crude oils from the Sharara-C oil field, Murzuq Basin, Southwestern Libya
VL  - 46
IS  - 1
SP  - 103
EP  - 123
DO  - 10.1111/jpg.12832
ER  - 

@article{
author = "Saheed, Ramadan Musbah M. and Šolević Knudsen, Tatjana and Faraj, Musbah Abduljalil M. and Nytoft, Hans Peter and Jovančićević, Branimir",
year = "2023",
abstract = "Crude oil samples from the Sharara-C oil field (Concession NC-115, Murzuq Basin, SW Libya) were analysed by organic geochemical methods in order to infer the geochemical characteristics of their respective source rocks. Aromatic hydrocarbons were analysed by gas chromatography – mass spectrometry (GC-MS), and gas chromatography – tandem mass spectrometry (GC-MS-MS) was used to analyse saturated biomarkers. The Sharara-C oils are interpreted to have been generated by marine shales containing mixed terrigenous and marine organic materials deposited in an intermediate (suboxic) environment. Age-specific biomarker ratios indicated that the oils are older than Cretaceous, and maturation-related parameters pointed to their high thermal maturity. Consistent with previous studies, source rocks are inferred to be “hot” shales in the Lower Silurian Tanezzuft Formation. Almost all the parameter ratios calculated varied over a very narrow range, indicating that the investigated oils were compositionally similar. The only significant difference that was noted concerned the sterane/hopane ratios whose variation suggested that there was some variability in the composition of the source organic material. The organic geochemical parameters determined for the Sharara-C crude oils were compared with published data on other crude oils from Concession NC-115. Almost all the parameters agreed well with previously published data on oils from this part of the Murzuq Basin. The greatest deviation concerned the values of some of the maturity parameters. This tended to confirm the conclusions of previous studies concerning the presence of a number of distinct oil families and sub-families in the Sharara oil field area which are genetically related but which have different maturities. © 2023 The Authors. Journal of Petroleum Geology.",
publisher = "John Wiley and Sons Inc",
journal = "Journal of Petroleum Geology",
title = "Geochemical characteristics of crude oils from the Sharara-C oil field, Murzuq Basin, Southwestern Libya",
volume = "46",
number = "1",
pages = "103-123",
doi = "10.1111/jpg.12832"
}

Saheed, R. M. M., Šolević Knudsen, T., Faraj, M. A. M., Nytoft, H. P.,& Jovančićević, B.. (2023). Geochemical characteristics of crude oils from the Sharara-C oil field, Murzuq Basin, Southwestern Libya. in Journal of Petroleum Geology
John Wiley and Sons Inc., 46(1), 103-123.
https://doi.org/10.1111/jpg.12832

Saheed RMM, Šolević Knudsen T, Faraj MAM, Nytoft HP, Jovančićević B. Geochemical characteristics of crude oils from the Sharara-C oil field, Murzuq Basin, Southwestern Libya. in Journal of Petroleum Geology. 2023;46(1):103-123.
doi:10.1111/jpg.12832 .

Saheed, Ramadan Musbah M., Šolević Knudsen, Tatjana, Faraj, Musbah Abduljalil M., Nytoft, Hans Peter, Jovančićević, Branimir, "Geochemical characteristics of crude oils from the Sharara-C oil field, Murzuq Basin, Southwestern Libya" in Journal of Petroleum Geology, 46, no. 1 (2023):103-123,
https://doi.org/10.1111/jpg.12832 . .

TY  - JOUR
AU  - Saheed, Ramadan Musbah M.
AU  - Šolević Knudsen, Tatjana
AU  - Faraj, Musbah Abduljalil M.
AU  - Nikolovski, Zlatko
AU  - Nytoft, Hans Peter
AU  - Jovančićević, Branimir
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4220
AB  - Seven crude oils from four oil fields in the Sirte and Murzuq Basins in Libya were investigated in order to estimate their organic geochemical homogeneity. Saturated biomarkers (n-alkanes and isoprenoids) were analyzed using gas chromatography-mass spectrometry (GC-MS). The parameters calculated from the distributions of n-alkanes and isoprenoid aliphatic alkanes, pristane and phytane were used to interpret the organic geochemical characteristics of the oils. Based on the high relative concentration of lower n-alkane homologues in the C11-C16range and high API values, the oils were classified as light oils. These results also implied that the oils were not biodegraded. The parameters calculated from the distributions of saturated biomarkers indicated that all investigated oils were generated from source rocks containing organic matter of a similar marine origin but with a contribution of terrestrial organic matter. The results also demonstrated that these source rocks were deposited in an oxic environment. The same source rock or the same type of source rocks for all seven samples were postulated. It was concluded that, if the crude oils from these distant basins originated from the same source rocks, they must have had different lengths of their migration pathways.
AB  - Седам сирових нафти из четири нафтна поља у Басенима Sirte и Murzuq у Либији
испитивани су са циљем да се процени њихова органско-геохемијска хомогеност. Заси-
ћени биомаркери (n-алкани и изопреноиди) анализирани су гасно-хроматографско–
–масеном спектрометријом (GC–MS). Параметри израчунати на основу расподеле
н-алкана и изопреноидних алифатичних алкана, пристана и фитана, употребљени су за
интерпретацију органско-геохемијских карактеристика нафти. На основу високе рела-
тивне концентрације нижих н-алканских хомолога у C11–C16 опсегу и високих API вред-
ности, нафте су класификоване као лаке нафте. Ови резултати су показали да нафте
нису биле биодеградоване. Параметри израчунати на основу расподеле засићених био-
маркера показали су да су све испитиване нафте настале из изворних стена које су садр-
жале органски материјал сличног маринског порекла али са доприносом сувоземног
органског материјала. Резултати су такође показали да су ове изворне стене сталожене у
оксичној средини. Претпостављено је да свих седам узорака потичу из исте изворне
стене или из изворних стена истог типа. Закључено је да, ако нафте из ових удаљених
басена потичу из исте изворне стене, дужине њихових миграционих путева су морале
бити различите.
PB  - Belgrade : Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Saturated biomarkers in the estimation of organic geochemical homogeneity of crude oils from four oil fields in Libya
T1  - Zasićeni biomarkeri u proceni organsko-geohemijske homogenosti sirovih nafti iz četiri naftna polja u Libiji
VL  - 85
IS  - 11
SP  - 1489
EP  - 1499
DO  - 10.2298/JSC200501055S
ER  - 

@article{
author = "Saheed, Ramadan Musbah M. and Šolević Knudsen, Tatjana and Faraj, Musbah Abduljalil M. and Nikolovski, Zlatko and Nytoft, Hans Peter and Jovančićević, Branimir",
year = "2020",
abstract = "Seven crude oils from four oil fields in the Sirte and Murzuq Basins in Libya were investigated in order to estimate their organic geochemical homogeneity. Saturated biomarkers (n-alkanes and isoprenoids) were analyzed using gas chromatography-mass spectrometry (GC-MS). The parameters calculated from the distributions of n-alkanes and isoprenoid aliphatic alkanes, pristane and phytane were used to interpret the organic geochemical characteristics of the oils. Based on the high relative concentration of lower n-alkane homologues in the C11-C16range and high API values, the oils were classified as light oils. These results also implied that the oils were not biodegraded. The parameters calculated from the distributions of saturated biomarkers indicated that all investigated oils were generated from source rocks containing organic matter of a similar marine origin but with a contribution of terrestrial organic matter. The results also demonstrated that these source rocks were deposited in an oxic environment. The same source rock or the same type of source rocks for all seven samples were postulated. It was concluded that, if the crude oils from these distant basins originated from the same source rocks, they must have had different lengths of their migration pathways., Седам сирових нафти из четири нафтна поља у Басенима Sirte и Murzuq у Либији
испитивани су са циљем да се процени њихова органско-геохемијска хомогеност. Заси-
ћени биомаркери (n-алкани и изопреноиди) анализирани су гасно-хроматографско–
–масеном спектрометријом (GC–MS). Параметри израчунати на основу расподеле
н-алкана и изопреноидних алифатичних алкана, пристана и фитана, употребљени су за
интерпретацију органско-геохемијских карактеристика нафти. На основу високе рела-
тивне концентрације нижих н-алканских хомолога у C11–C16 опсегу и високих API вред-
ности, нафте су класификоване као лаке нафте. Ови резултати су показали да нафте
нису биле биодеградоване. Параметри израчунати на основу расподеле засићених био-
маркера показали су да су све испитиване нафте настале из изворних стена које су садр-
жале органски материјал сличног маринског порекла али са доприносом сувоземног
органског материјала. Резултати су такође показали да су ове изворне стене сталожене у
оксичној средини. Претпостављено је да свих седам узорака потичу из исте изворне
стене или из изворних стена истог типа. Закључено је да, ако нафте из ових удаљених
басена потичу из исте изворне стене, дужине њихових миграционих путева су морале
бити различите.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Saturated biomarkers in the estimation of organic geochemical homogeneity of crude oils from four oil fields in Libya, Zasićeni biomarkeri u proceni organsko-geohemijske homogenosti sirovih nafti iz četiri naftna polja u Libiji",
volume = "85",
number = "11",
pages = "1489-1499",
doi = "10.2298/JSC200501055S"
}

Saheed, R. M. M., Šolević Knudsen, T., Faraj, M. A. M., Nikolovski, Z., Nytoft, H. P.,& Jovančićević, B.. (2020). Saturated biomarkers in the estimation of organic geochemical homogeneity of crude oils from four oil fields in Libya. in Journal of the Serbian Chemical Society
Belgrade : Serbian Chemical Society., 85(11), 1489-1499.
https://doi.org/10.2298/JSC200501055S

Saheed RMM, Šolević Knudsen T, Faraj MAM, Nikolovski Z, Nytoft HP, Jovančićević B. Saturated biomarkers in the estimation of organic geochemical homogeneity of crude oils from four oil fields in Libya. in Journal of the Serbian Chemical Society. 2020;85(11):1489-1499.
doi:10.2298/JSC200501055S .

Saheed, Ramadan Musbah M., Šolević Knudsen, Tatjana, Faraj, Musbah Abduljalil M., Nikolovski, Zlatko, Nytoft, Hans Peter, Jovančićević, Branimir, "Saturated biomarkers in the estimation of organic geochemical homogeneity of crude oils from four oil fields in Libya" in Journal of the Serbian Chemical Society, 85, no. 11 (2020):1489-1499,
https://doi.org/10.2298/JSC200501055S . .