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

Hakimi, Mohammed Hail; Al-Matary, Adel M.; Ahmed, Abdulghani F.

doi:10.1016/j.ejpe.2017.06.002

Cited by 18 publications

(4 citation statements)

References 24 publications

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“…Pr/Ph values of less than 0.8 with CPI values of less than 1.0 indicate saline to hypersaline conditions that are associated with carbonate and evaporate deposition. In contrast, Pr/Ph values greater than 3.0 indicate terrigenous plant input deposited under oxic to suboxic conditions (Peters et al, 2005;Hakimi et al, 2018).…”

Section: Gas Chromatographic Analysismentioning

confidence: 99%

“…Gas chromatographs of the extracted rock samples from the studied formations in well Sh-8 Figure 8. A plot of the CPI values vs. the Pr/Ph ratios (Hakimi et al, 2018) The Pr/n-C17 ratio is helpful for discriminating between OM that formed in a marine environment (when the ratio is <0.5) and OM that formed in a swamp environment (when the ratio is >1.0) (Osuji and Antia, 2005). Lower values of Ph/n-C17 and Pr/n-C18 indicate a marine source rock bearing type II kerogen (Obermajer, 1999).…”

Section: Gas Chromatographic Analysismentioning

confidence: 99%

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Hydrocarbon Potential of the Middle–Late Jurassic Series of Northwestern Iraq: A Case Study in the Shaikhan Oil Field

2020

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The Middle–Late Jurassic Sargelu, Naokelekan, and Barsarin formations of northwestern Iraq have been investigated in the Shaikhan oilfield (well Shaikhan-8) to assess their potential for hydrocarbon generation.The results of total organic carbon analysis and rock-eval pyrolysis revealed a good-to-excellent hydrocarbon content and suggest that the depositional conditions were suitable for the production and preservation of organic matter. The thermal maturity proxy indicates that the studied formations were at the start of the hydrocarbon generation period. Most of the samples from the Sargelu and Barsarin formations belong to kerogen type II, whereas those of the Naokelekan Formation belong to kerogen type II/III. The Pr/Ph, Pr/n-C17, and Ph/n-C18 ratios of the extracted bitumen indicated that the organic matter originated from marine sources under reducing conditions. The stable carbon isotope composition of the saturated and aromatic hydrocarbon fractions ranged from –28.3 to –27.7 ‰ and –28.0 to –27.7 ‰, respectively. The biomarker results show a high contribution of marine organic matter that was preserved under relatively anoxic conditions. The profiles of the burial and thermal maturity history show that the simulated generation zones, based on the calculated vitrinite reflectance, indicate immature (0.44%–0.6%)-to-early oil generating (0.6%–0.75%) source rock. The low thermal maturity of the studied formations relative to the depth may be attributed to the low geothermal gradient and heat flow.

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Section: Gas Chromatographic Analysismentioning

confidence: 99%

Section: Gas Chromatographic Analysismentioning

confidence: 99%

Hydrocarbon Potential of the Middle–Late Jurassic Series of Northwestern Iraq: A Case Study in the Shaikhan Oil Field

2020

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“…Sudaki TPH konsantrasyonlarını belirlemek için hidrokarbonlar tarafından kirletilmiş suyun gaz kromatografisi (GC) ile analizleri yapılmaktadır. [10], [11], Karbon Tercih İndeksi (CPI) [12], Pr/Ph-CPI [13], [14] ve Pr/nC17-Ph/nC18 [15] diyagramları kullanılarak su örnekleri yorumlanmıştır. Su örneklerinin gaz kromatogramları, EK'de verilmiştir.…”

Section: Materyal Ve Yöntemunclassified

“…Şekil 5: Pristan/Fitan ile Karbon Tercih İndeksi (CPI) diyagramı [13]. Su numuneleri, grafikte mavi renkli daireler ile gösterilmiştir.…”

Section: Olgunluk Ve çöKelme Ortamı Redoks Koşullarıunclassified

Organic Hydrogeochemical Evidences of Hasanoğlan (Ankara) Petroleum System

Özdemir¹

2019

Pamukkale J Eng Sci

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Bu makale, Hasanoğlan (Ankara) bölgesinin organik hidrojeokimyasal, iyot jeolojisi ve tektonik özellikleri incelenerek bölgenin petrol ve doğalgaz potansiyelinin değerlendirilmesine yönelik bir çalışmadır. Çalışma, üç aşamada yürütülmüştür. Birinci aşamada, bölgenin stratigrafik ve tektonik ilişkilerini konu alan öncel çalışmalar incelenmiştir. Böylece, organik hidrojeokimyasal ve jeofizik değerlendirmeler için gerekli olan veriler derlenmiştir. İkinci aşamada, manyetik ve bölgesel gravite haritaları hazırlanarak çalışma alanındaki tektonik yapıların özellikleri incelenmiş ve olası petrol kapanı belirlenmiştir. Son aşamada ise, elde edilen tüm veriler birlikte yorumlanarak Hasanoğlan bölgesinin petrol ve doğalgaz potansiyeli değerlendirilmiştir. Bölgedeki su kaynaklarından alınan su numunelerinde yapılan TPH (Toplam Petrol Hidrokarbonları) analizlerinde, n-alkan hidrokarbonlar tespit edilmiştir. Su numunelerindeki n-alkanların tamamı, ham petrol (petrojenik) hidrokarbonlarıdır. Olgun petrol hidrokarbonları içeren ve iyotça zengin suların varlığı nedeniyle, bölge yüksek petrol ve doğalgaz potansiyeline sahiptir. This article is a study to evaluate the oil and gas potential of the region by investigating the organic hydrogeochemical, iodine geology and tectonic characteristics of Hasanoğlan (Ankara) region. The study was conducted in three steps. In the first step, preliminary studies on the stratigraphic and tectonic relations of the region have been examined. Thus, the data required for organic hydrogeochemical and geophysical evaluations are compiled. In the second step, aeromagnetic and regional gravity maps were prepared and the possible oil trap and characteristics of the tectonic structures in the study area were determined. In the last step, all data are evaluated and oil and gas potential of Hasanoğlan region is interpreted. TPH (Total Petroleum Hydrocarbons) analysis results of water samples showed n-alkane hydrocarbons. All n-alkanes in water samples are crude oil (petrogenic) hydrocarbons. Due to the presence of mature petroleum hydrocarbons and iodine-rich waters, the region has high oil and gas potential.

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Geochemical characteristics of n-alkanes and isoprenoids in coal seams from Zhuji coal mine, Huainan coalfield, China, and their relationship with coal-forming environment

Wang

Liu

2018

Environ Sci Pollut Res

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Ten coal seams in Upper Shihezi Formation, Lower Shihezi Formation, and Shanxi Formation from the Zhuji mine, Huainan coalfield, China, were analyzed for n-alkanes and isoprenoids (pristine and phytane) using gas chromatography-mass spectrometry (GC-MS), with an aim of reconstructing the coal-forming plants and depositional environments along with organic carbon isotope analyses. The total n-alkane concentrations ranged from 34.1 to 481 mg/kg. Values of organic carbon isotope (δC) ranged from - 24.6 to - 23.7‰. The calorific value (Q), maximum vitrinite reflectance (Ro), proximate, and ultimate analysis were also determined but showed no correlation with n-alkane concentrations. Carbon Preference Index (CPI) values ranged from 0.945 to 1.30, suggesting no obvious odd/even predominance of n-alkane. The predominance of C and C n-alkanes implied that the coal may be deposited in the fresh and mildly brackish environment. According to the contrary changing trend of pristine/phytane (Pr/Ph) ratio and boron concentrations, Pr/Ph can be used as an indicator to reconstruct the marine transgression-regression in sedimentary environment of coal formation. The influence of marine transgression may lead to the enrichment of pyrite sulfur in the coal seam 4-2. C3 plants (- 32 to - 21‰) and marine algae (- 23 to - 16‰) were probably the main coal-forming plants in the studied coal seams. No correlation of the n-alkane concentration and redox condition of the depositional environment with organic carbon isotope composition were found.

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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

Cited by 18 publications

References 24 publications

Hydrocarbon Potential of the Middle–Late Jurassic Series of Northwestern Iraq: A Case Study in the Shaikhan Oil Field

Hydrocarbon Potential of the Middle–Late Jurassic Series of Northwestern Iraq: A Case Study in the Shaikhan Oil Field

Organic Hydrogeochemical Evidences of Hasanoğlan (Ankara) Petroleum System

Geochemical characteristics of n-alkanes and isoprenoids in coal seams from Zhuji coal mine, Huainan coalfield, China, and their relationship with coal-forming environment

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