Maturity determination of organic matter in coals using the methylphenanthrene distribution

Kvalheim, Olav M.; Christy, Alfred A.; Telnæs, N.; Bjørseth, Alf

doi:10.1016/0016-7037(87)90179-7

Cited by 194 publications

(79 citation statements)

References 5 publications

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“…Based on the high MPR value for sample A (2.59), the calculated vitrinite reflectance ratio suggested for high mature samples (%R c = -0.6MPI1 + 2.3) has been applied. Values based on the methylphenanthrene distribution factor (MPDF) ( Table 3, column 18) (Kvalheim et al, 1987) range from 0.70%R c to 1.32%R c (Table 3, column 25; Fig. 6).…”

Section: Medium-range Hydrocarbon Maturity Parametersmentioning

confidence: 99%

Organic Geochemistry of Barents Sea Petroleum: Thermal Maturity and Alteration and Mixing Processes in Oils and Condensates

Lerch

Karlsen

Matapour

et al. 2016

Journal of Petroleum Geology

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The petroleum system in the Barents Sea is complex with numerous source rocks and multiple uplift events resulting in the remigration and mixing of petroleum. In order to investigate the degree of mixing, 50 oil and condensate samples from 30 wells in the SW Barents Sea were geochemically analysed by GC-FID and GC-MS to INTRODUCTIONRecent oil discoveries in the Barents Sea, such as Gotha, Alta, Wisting, Johan Castberg (Skrugard and Havis), Nucula and Goliat ( Fig. 1) (Norwegian Petroleum Directorate, 2014), are evidence for the presence of commercial volumes of liquid petroleum in an area which was long considered to be gas-prone (Stewart et al., 1995). These discoveries led to renewed geochemistry-based investigations of the petroleum systems in the Barents Sea (Bjorøy et al., 2009;Killops et al., 2014;Rodrigues-Duran et al., 2013). The presence of multiple potential source rocks may have resulted in the occurrence of mixed petroleum charges (Ohm et al., 2008;Vobes, 1998). Petroleum distribution and composition was influenced by several episodes of Cenozoic uplift and burial (Cavanagh et al., 2006;Ohm et al., 2008). Cenozoic uplift had a negative effect on the petroleum systems because it resulted in the cessation of hydrocarbon generation and expulsion (Henriksen et al., 2011). In addition, uplift resulted in alterations to the physical properties of trapped hydrocarbons, including changes to gas-to-oil ratios and associated expansion of gas columns, causing oil to be forced out of structures below the spill point (Nyland et al., 1992). Remigration/leakage of petroleum phases also occurred as a result of cap-rock failure or fault reactivation (Ohm et al., 2008;Ostanin et al., 2013). Thus geochemical interpretations in the Barents Sea suggest that uplift-related remigration/long-distance migration may be the key to understanding the complex petroleum systems present (Lerch et al., 2016;Ohm et al., 2008;Rodrigues-Duran et al., 2013).While Rodrigues Duran et al. (2013) focused mainly on the gaseous and light hydrocarbon maturation and alteration parameters in samples from the Hammerfest Basin, Ohm et al. (2008) among others investigated isotope signatures of oils from a larger area to identify potential source rocks. Bjorøy et al. (2009) correlated source rock extracts with oils to determine genetic relationships, and Killops et al. (2014) used novel age-related biomarkers to identify possible source rocks. However, until now few studies have attempted to correlate maturity signatures in order to understand regional variations in petroleum composition.The purpose of this study is to investigate the molecular evidence for the presence of mixed or transformed (biodegraded or water-washed) petroleum in the Barents Sea, and to assess regional similarities and/or differences in petroleum. Saturated and aromatic maturity parameters from the medium molecular (C 14 -C 18 ) and biomarker-range (C 20+ ) hydrocarbon fractions were analysed. Results were compared with results obtained by Lerch et al. (2016), who investigat...

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Section: Medium-range Hydrocarbon Maturity Parametersmentioning

confidence: 99%

Organic Geochemistry of Barents Sea Petroleum: Thermal Maturity and Alteration and Mixing Processes in Oils and Condensates

Lerch

Karlsen

Matapour

et al. 2016

Journal of Petroleum Geology

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“…However, compared with the maturity parameters of saturated hydrocarbon, the maturity parameters of aromatic hydrocarbon could judge the high maturity samples. In addition to the commonly used methyl phenanthrene index MPI [24] [25], Chakhmakhchev et al put forward dimethyl-benzothiophene maturity parameters. The works of the relationship between R o and a dimethyl-benzothiophene ratio parameter have done a lot of.…”

Section: The Relationship Between C 27 /C 29 Ratio and Aromatics Matumentioning

confidence: 99%

Thermal Effect on the Distribution of Regular Sterane and Geological Significance

Yang¹,

Zhang²,

Chen³

et al. 2017

OJOGas

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In order to study thermal effect on distribution characteristics of regular sterane in humic coals, a suit of 25 coals derived from Kuqa Depression in Tarim Basin and Ordos Basin are studied to investigate the distribution of regular sterane in different maturity, which mainly discusses the thermal effect. The results show that the C 27 ααα/C 29 ααα regular sterane ratio has a linear relationship with R o (t max ) and aromatic hydrocarbon maturity parameters in the coals from mature to high-mature stage. It suggests that the distribution of the C 27 , C 29 regular steranes will fail to reflect original source input in high evolutionary stage. On the basis of thermal simulation experiment results, it further proves that the distribution patterns result from the demethylation effect of C 29 sterane in the mature to high mature evolution stage and the C 27 ααα/C 29 ααα regular sterane increases with increasing maturity. The breakage of C-C key in branched chain from C 27 , C 29 regular steranes to make C 27 ααα/C 29 ααα regular sterane ratio invariance at high and over mature stage. Therefore, the ratio can be used to distinguish the maturity in high and over mature stage.

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“…Both ma tu rity in di ces and es ti mates of tem per a ture of gen er a tion of hy dro car bons for oils from the Lopushna field are within the range de ter mined for oils ac cu mulated in the Carpathian flysch se quence (Kotarba et al, 2007;Wiêc³aw et al, 2012). (Radke, 1988); R cal(MPR) = -0.166+2.242(MPR1) (Kvalheim et al, 1987); DBT -dibenzotiophene; MDR = 4-MDBT/1-MDBT: MDBTmethyldibenzotiophene; R cal(DBT) = 0.51+0.073MDR; T max(DBT) = 423+5.1MDR; for other ex pla na tions see Ta ble 1 Ta ble 6…”

Section: Maturitymentioning

confidence: 99%

Origin and migration of oil from the Ukrainian Outer Carpathians to their Mesozoic basement: the case of the Lopushna traps

Radkovets¹,

Kotarba

Koltun³

et al. 2015

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1 Na tional Acad emy of Sci ences of Ukraine, In sti tute of Ge ol ogy and Geo chem is try of Com bus ti ble Min er als, Naukova 3a, 79060 Lviv, Ukraine The Lopushna oil field has been dis cov ered in Mesozoic-Paleogene strata of the plat form base ment be neath the Ukrai nian Outer (Flysch) Carpathians. Oils from two main ac cu mu la tions, oc cur ring in Up per Cre ta ceous sand stone and Up per Ju rassic lime stone res er voirs, have been ana lysed in or der to iden tify their or i gin and re la tion to the known pe tro leum sys tems in the re gion of the Outer Carpathians and the base ment of the Carpathian Foredeep. Re sults of geo chem i cal in ves ti ga tions of oils, in clud ing biomarker and iso to pic data, show a good cor re la tion with oils ac cu mu lated in Carpathian flysch strata. The oils are low-sul phur and did not un dergo sig nif i cant deg ra da tion. They were gen er ated from Type II or II/III kerogen, de posited in anoxic en vi ron ments in clastic sed i ments. Gen er a tion oc curred at the peak of "oil win dow", prob a bly in the tem per ature range of 122 to 126 o C. The pres ence of oleanane in di cates Cre ta ceous or youn ger source rocks. Good cor re la tion of biomarker and iso to pic data with the or ganic mat ter dis persed in the Oligocene Menilite Beds oc cur ring at the top of the Carpathian flysch suc ces sion al lowed iden ti fi ca tion of these as source rocks for oils of the Lopushna field, which thus can be re garded as an oil fam ily of the Outer Carpathians. The mi gra tion dis tance for both the Lopushna oils and oils ac cu mu lated in the Carpathian flysch strata was sim i lar. A num ber of sub-ver ti cal dis lo ca tions, along which the sub sided flysch strata oc cur at the same depth level as the Ju ras sic and Cre ta ceous rocks of the plat form, can be as sumed as pos si ble mi gra tion pathways from the ma ture source rocks of the Oligocene Menilite Beds of the Boryslav-Pokuttya, Skyba or Krosno units to the Lopushna type traps, which sug gests the pos si bil ity of ex is tence of other hy dro car bon ac cu mu la tions of this type. The Lopushna field so far is unique in con tain ing this type of oil found in the base ment of the Ukrai nian Carpathian Foredeep.

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Maturity determination of organic matter in coals using the methylphenanthrene distribution

Cited by 194 publications

References 5 publications

Organic Geochemistry of Barents Sea Petroleum: Thermal Maturity and Alteration and Mixing Processes in Oils and Condensates

Organic Geochemistry of Barents Sea Petroleum: Thermal Maturity and Alteration and Mixing Processes in Oils and Condensates

Thermal Effect on the Distribution of Regular Sterane and Geological Significance

Origin and migration of oil from the Ukrainian Outer Carpathians to their Mesozoic basement: the case of the Lopushna traps

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