Petrology, rank and evidence for petroleum generation, Upper Triassic to Middle Jurassic coals, Central Alborz Region, Northern Iran

Stasiuk, Lavern D.; Goodarzi, Fariborz; Bagheri-Sadeghi, H.

doi:10.1016/j.coal.2005.11.002

Cited by 21 publications

(3 citation statements)

References 14 publications

(20 reference statements)

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“…Occurrence of fluorescent exsudatinite and also the presence of micrinite are evidences for oil generation from the Hive coals of the Southern Alborz (Mukhopadhyay, 1991;Gentzis and Goodarzi, 1994;Stasiuk et al, 2006).…”

Section: Coaly Faciesmentioning

confidence: 99%

Thermal maturity of the Upper Triassic–Middle Jurassic Shemshak Group (Alborz Range, Northern Iran) based on organic petrography, geochemistry and basin modelling: implications for source rock evaluation and petroleum exploration

Shekarifard

Baudin²,

Seyed–Emami

et al. 2011

Geol. Mag.

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Organic petrography and geochemical analyses have been carried out on shales, carbonaceous shales and coals of the Shemshak Group (Upper Triassic–Middle Jurassic) from 15 localities along the Alborz Range of Northern Iran. Thermal maturity of organic matter (OM) has been investigated using vitrinite reflectance, Rock-Eval pyrolysis and elemental analysis of kerogen. Reflectance of autochthonous vitrinite varies from 0.6 to 2.2% indicating thermally early-mature to over-mature OM in the Shemshak Group, in agreement with other maturity parameters used. The shales of the Shemshak Group are characterized by poor to high residual organic carbon contents (0.13 to 5.84%) and the presence of hydrogen-depleted OM, predominantly as a consequence of oxidation of OM at the time of deposition and the hydrogen loss during petroleum generation. According to light-reflected microscopy results, vitrinite/vitrinite-like macerals are dominant in the kerogen concentrates from the shaly facies. The coals and carbonaceous shales of the Shemshak Group show a wide range in organic carbon concentration (3.5 to 88.6%) and composition (inertinite- and vitrinite-rich types), and thereby different petroleum potentials. Thermal modelling results suggest that low to moderate palaeo-heat flow, ranging from 47 to 79 mW m−2 (57 mW m−2 on average), affected the Central-Eastern Alborz basin during Tertiary time, the time of maximum burial of the Shemshak Group. The maximum temperature that induced OM maturation of the Shemshak Group seems to be related to its deep burial rather than to a very strong heat flow related to an uppermost Triassic–Liassic rifting. The interval of petroleum generation in the most deeply buried part of the Shemshak Group (i.e. Tazareh section) corresponds to Middle Jurassic–Early Cretaceous times. Exhumation of the Alborz Range during Late Neogene time, especially along the axis of the Central-Eastern Alborz, where maximum vitrinite reflectance values are recorded, probably destroyed possible petroleum accumulations. However, on the northern flank of the Central-Eastern Alborz, preservation of petroleum accumulations may be expected. The northern part of the basin therefore seems the best target for petroleum exploration.

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Section: Coaly Faciesmentioning

confidence: 99%

Thermal maturity of the Upper Triassic–Middle Jurassic Shemshak Group (Alborz Range, Northern Iran) based on organic petrography, geochemistry and basin modelling: implications for source rock evaluation and petroleum exploration

Shekarifard

Baudin²,

Seyed–Emami

et al. 2011

Geol. Mag.

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“…In many basins of the world -the Gippsland Basin of Australia (Shanmugam, 1985), the Mahakam Delta of Indonesia (Huc et al, 1986;Peters et al, 2000), and the Turfan Basin of China (Huang et al, 1991;Sun et al, 2000) the hydrocarbon (oil and gas) potential of coals has been studied; accordingly, studies continue at present in various places (Kotarba et al, 2002;Stasiuk et al, 2006;Davis et al, 2007;Adedosu et al, 2010;Yalçın Erik and Sancar, 2010;Adedosu et al, 2011).…”

Section: Introductionmentioning

confidence: 97%

Hydrocarbon generation potential and Miocene–Pliocene paleoenvironments of the Kangal Basin (Central Anatolia, Turkey)

Erik

2011

Journal of Asian Earth Sciences

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“…Although the mineralogy, inorganic geochemistry, and stratigraphy of the Mesozoic coals of Iran have been investigated by several authors (e.g. Pazand 2015;Goodarzi et al 2006;Ghassabiyan et al 2010; Moore and Esmaeili 2012;Ardebili et al 2012;Moosavirad et al 2013;Ghavidel-Syooki et al 2015;Rajabzadeh et al 2016), only little information is available on the characteristics of organic material that formed these coals (Solaymani and Taghipour 2012;Stasiuk et al 2006;Alizadeh et al 2011Alizadeh et al , 2015Ghavidel-Syooki et al 2015). In order to investigate depositional conditions, plant input and thermal maturity of the aforementioned Iranian coal deposits, a wide range of organic petrological and organic geochemical methods was applied.…”

mentioning

confidence: 99%

Organic petrology and geochemistry of Triassic and Jurassic coals of the Tabas Basin, Northeastern/Central Iran

Nazanin

Rajabzadeh

Littke

et al. 2019

Int J Coal Sci Technol

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Jurassic and Triassic coals and organic matter-rich shales of the Tabas Basin, Iran, were investigated with respect to their thermal maturation and petrographic composition. The Triassic coals of the Parvadeh coal field range in vitrinite reflectance between 1.17% and 1.37% and the Jurassic coals of the Mazino coal field between 2.08% and 2.29% VR r . Maceral analysis revealed a predominance of vitrinite in all samples, with slightly higher percentages of inertinite in the Jurassic samples. Rock-Eval analyses confirm the presence of type III kerogen in the Triassic coals, while the Jurassic coals contain strongly carbonized residual kerogen. The range of sulfur contents for coals from the Parvadeh coal field (0.37% to 4.64%) and Mazino coal field (0.45% to 2.92%) is related to the effect of marine water in peat. The studied samples are characterized by the predominance of short-over long-chained n-alkanes. The relatively high Pr/Ph ratios indicate predominance of terrestrial organic matter whereas Pr/n-C 17 and Ph/n-C 18 ratios prove oxic conditions during deposition. In addition, the DBT/Phen ratio shows that these coals formed in fluvial/deltaic environments. Molecular geochemical parameters such as carbon preference index (CPI, 0.99-1.04), methyl phenanthrene index (MPI, 1.20-1.60), methyl naphthalene ratio (MNR, 1.61-3.45), and ethyl naphthalene ratio (ENR, 4-6.78) confirm the high maturity of the samples. Burial and thermal history reconstruction indicates necessity of an erosional thickness of about 4000 m in the Parvadeh area. Towards the Mazino area, a higher basal heat flow up to 80 mW m -2 is assumed for the Paleogene leading to higher maturities.

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Petrology, rank and evidence for petroleum generation, Upper Triassic to Middle Jurassic coals, Central Alborz Region, Northern Iran

Cited by 21 publications

References 14 publications

Thermal maturity of the Upper Triassic–Middle Jurassic Shemshak Group (Alborz Range, Northern Iran) based on organic petrography, geochemistry and basin modelling: implications for source rock evaluation and petroleum exploration

Thermal maturity of the Upper Triassic–Middle Jurassic Shemshak Group (Alborz Range, Northern Iran) based on organic petrography, geochemistry and basin modelling: implications for source rock evaluation and petroleum exploration

Hydrocarbon generation potential and Miocene–Pliocene paleoenvironments of the Kangal Basin (Central Anatolia, Turkey)

Organic petrology and geochemistry of Triassic and Jurassic coals of the Tabas Basin, Northeastern/Central Iran

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