Biomarker analysis of the upper Jurassic Naokelekan and Barsarin formations in the Miran Well-2, Miran oil field, Kurdistan region, Iraq

Mohialdeen, Ibrahim M.J.; Mustafa, Karwan A.; Salih, Danyar A.; Sephton, M. A.; Saeed, Diyar A.

doi:10.1007/s12517-018-3405-x

Cited by 12 publications

(21 citation statements)

References 41 publications

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“…This conclusion was drawn by Mohialdeen et al (2018) at the Miran oilfield, northeastern Iraq. 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.…”

Section: Gas Chromatographic Analysismentioning

confidence: 83%

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: 83%

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

2020

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“…Selected peaks (e.g. nalkanes, hopanes, tricyclic terpanes, and steranes) were identified based on their retention times and comparison with identifications reported by previous researchers [20,21,22]. The selected ion monitoring capabilities of the data acquisition system permitted specific ions to be monitored, such as n-alkanes (m/z 85), triterpanes (m/z 191), and steranes (m/z 217) of saturated hydrocarbon ratios, as presented by previous works [21,22].…”

Section: Samples and Experimental Methodsmentioning

confidence: 93%

Organic Geochemistry and Thermal Maturity Assessment of Cretaceous Balambo Formation from Selected Sites, Kurdistan, NE Iraq

Sarraj

Mohialdeen

2021

eijs

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The Cretaceous Balambo Formation from three sections in Kurdistan Region of Northern Iraq was studied. The selected sections are located in the Zagros Fold -Thrust Belt. Eleven rock samples were analyzed by means of the organic geochemical method, Bitumen extraction method, and gas chromatography/mass spectrometry to determine the bitumen and hydrocarbon content, kerogen types, origin of organic matter, thermal maturity level, and depositional environment. The analyzed samples are considered to have an excellent potential in Baranan-1.G1 and Sazan sections, with poor to fair potential in Baraw section. The Baranan-1.G1 source rocks are of type II kerogen (oil prone), whereas Sazan and Baraw samples are of type II/III (oil/ gas prone). Detailed distribution analysis of biomarkers such as normal alkane, isoprenoids, sterane and terpane was performed on saturated hydrocarbons. The mode of n-alkanes and isoprenoids distribution in all analyzed samples is similar, with a unimodal distribution that indicates non-biodegraded hydrocarbons, with the same range of alkane compounds between C13-C34 alkanes. The results of n-C17, pristane, n-C18 and phytane, and regular steranes show that the source rocks of Balambo Formation in Baranan-1.G1 are mainly rich with algal marine organic matter deposited under a reducing environment, while Baraw and Sazan sections are composed of mixed marine organic matter that refers to terrestrial land plants input deposited under reducing anoxic/dysoxic environments. Thermal maturation appraisal is deduced from Pristane/n-C17 versus Phytane/n-C18 diagram, Carbon Preference Index (CPI), C29 ββ/ (ββ+αα), C29 20S/ (20S +20R), C32 22S/ (22S+22R), and Ts/ (Ts+Tm). All these parameters indicate that the analyzed samples are mature and have entered the oil window (early to peak oil window). Biomarker ratios of C22/C21, C24/C23 and C26/C25, C31R/C30H show that the Balambo Formation is composed mostly of carbonates with less shale beds.

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“…El-Diasty et al (2018) conducted a geochemical characterization of source rocks and oils from Cretaceous-Miocene Tertiary Formations, indicating abundance of solid bitumens in the source rock samples, as well as maturity level within the oil-generation window. A biomarker analysis for Naokelekan and Barsarin Formations from core Miran-2 proved that both formations are rich in organic matter, and are placed at the oil window peak from a maturity point of view (Mohialdeen et al, 2018). Up to date, Naokelekan Fm.…”

Section: Introductionmentioning

confidence: 97%

“…Beginning with the 90s of the last century (Odisho and Othman, 1992) and up to the present (e.g. Mohialdeen et al, 2018), a buildup of an extensive geochemical scientific research-literature on the Mesozoic sedimentary Formations of NE Iraq has provided considerable data in relation to their oil and/or gas potentiality and productivity. Recent studies (e.g.…”

Section: Introductionmentioning

confidence: 99%

Organic petrological and geochemical appraisal of the Upper Jurassic Naokelekan Formation, Kurdistan, Iraq

Damoulianou

Kolo

Borrego

et al. 2020

International Journal of Coal Geology

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Biomarker analysis of the upper Jurassic Naokelekan and Barsarin formations in the Miran Well-2, Miran oil field, Kurdistan region, Iraq

Cited by 12 publications

References 41 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 Geochemistry and Thermal Maturity Assessment of Cretaceous Balambo Formation from Selected Sites, Kurdistan, NE Iraq

Organic petrological and geochemical appraisal of the Upper Jurassic Naokelekan Formation, Kurdistan, Iraq

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