M Sadeghi; M.R Kamali; R Ghavami Riabi; B Qorbani
Abstract
In this study, rock samples from the pabdeh and Gurpi formations of well#NH-01 in the Nosrat Oil Field subjected to geochemical evaluation techniques using Rock-Eval pyrolysis, bitumen extraction, Column Chromatography and gas chromatography. The result of geochemical study indicates Kerogen type II ...
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In this study, rock samples from the pabdeh and Gurpi formations of well#NH-01 in the Nosrat Oil Field subjected to geochemical evaluation techniques using Rock-Eval pyrolysis, bitumen extraction, Column Chromatography and gas chromatography. The result of geochemical study indicates Kerogen type II and III. However, most samples tend to related kerogen Type II suggesting that source rock was deposited in the anoxic to suboxic environments and most organic matter derived from marine and partly from terrestrial sources. The pabdeh Formation shows fair to good hydrocarbon potential and has already entered oil generation window, whereas the Gurpi Formation has Poor to fair hydrocarbon potential. The Gas chromatography conducted on these samples indicates that most samples are rich in saturated hydrocarbons and also suggests organic matter of the pabdeh and Gurpi formations are all indigenous.
E. Asadi Mehmandosti; B. Alizadeh; M. H. Adabi
Abstract
Marun Oilfield is one of the main Iranian Oilfield in Dezful Embayment, Zagros area which was studied geochemically in this paper. Forty three samples from different source and reservoir rocks include Garue, Gadvan, Dariyan, Kazhdumi, Sarvak, Gurpi and Pabdeh formations from different oil wells were ...
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Marun Oilfield is one of the main Iranian Oilfield in Dezful Embayment, Zagros area which was studied geochemically in this paper. Forty three samples from different source and reservoir rocks include Garue, Gadvan, Dariyan, Kazhdumi, Sarvak, Gurpi and Pabdeh formations from different oil wells were analyzed by Rock Eval VI. In addition, 23 selected extract bitumens and 6 crude oils of Bangestan and Khami reservoirs were studied by Liquid Chromatography and Gas Chromatography to compare with each other. Rock Eval data showed that Kazhdumi and Pabdeh formations with average TOC of 4.13 wt% and more than 12 mg HC/g rock amount of S2 had high hydrocarbon potential regard to other samples. HI vs. Tmax and S2 vs. TOC diagrams indicated that the Type II kerogen was the main type of kerogen in studied samples. Furthermore, Garue, Gadvan and Kazhdumi samples have high thermal maturity in compare with other samples. Also, variations of PI and Tmax versus depth indicate that Pabdeh and Gurpi samples had less thermal maturity in compare with Kazhdumi and Garue samples. Chromatograms study and variation of Pr/nC17 and Ph/nC18 indicate that studied samples have no or little evidence of biodegradation and crude oils of Bangestane and Khami reservoirs was formed in anoxic environment from the source rock with type II kerogen.
M. Memariani; H. Kermanshahi; M. R. Kamali
Abstract
With respect to distribution of Surmeh Formation in Persian Gulf region, this formation may act as candidate source rock for hydrocarbon accumulation in this region. A comprehensive geochemical analysis including Rock-eval Pyrolysis, Gas Chromatography (GC), Gas Chromatography – Mass Spectrometry ...
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With respect to distribution of Surmeh Formation in Persian Gulf region, this formation may act as candidate source rock for hydrocarbon accumulation in this region. A comprehensive geochemical analysis including Rock-eval Pyrolysis, Gas Chromatography (GC), Gas Chromatography – Mass Spectrometry (GC-MS), were carried out on cuttings, in order to determine its hydrocarbon potentiality. Based on Rock-Eval data, the organic matter of the Surmeh formation is type II and III kerogen, with low maturity being at the end of diagensis stage. It exhibits a poor source rock characterization with low content of TOC. A close similarity can be seen, between organic matter extracted from Surmeh sample with that of oil sample collected from Upper Dariyan, Lower Dariyan and Maudud reservoir in the field. Biomarker results indicate that an open marine and few terrestrial input source rocks deposited in an anoxic condition with carbonate origin. Based on geochemical investigations Surmeh Formation isn't suitable source rock in the study area locally. Biomarker derived from rock extracts and trapped oils indicated that they share the same origin and were stained by laterally migrating oils from distant area.
A. Rajabi-Harsini; M. Memariani
Abstract
In this study, in order to evaluate the geochemical characterization of Kangan Formation in well B in South Pars Gas Field, geochemical analysis (including preliminary and complementary analysis such as Rock-Eval Pyrolysis, extraction of organic matter (EOM), bitumen fractionation, Gas chromatography ...
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In this study, in order to evaluate the geochemical characterization of Kangan Formation in well B in South Pars Gas Field, geochemical analysis (including preliminary and complementary analysis such as Rock-Eval Pyrolysis, extraction of organic matter (EOM), bitumen fractionation, Gas chromatography and Gas chromatography-Mass Spectrometry) were carried out on core samples. Geochemical results reveal that these samples have kerogen type III and II, indicating a marine organic matter with a little terrestrial input. The organic matter of these samples was derived from source rock(s), with clastic-carbonate lithology which deposited under anoxic to subanoxic conditions. In addition, the above samples exhibt poor to moderate genetic potential with kerogen maturity at the beginning of oil generation (late diagenesis to early catagsnesis). Also, based on column chromatography, the above samples are mainly composed of paraffinic-naphthenic and paraffinic hydrocarbons. A negligible amount of hydrocarbons seems to have been generated locally from Kangan Formation.
