Geochemistry of the Organic Matter of Ulug-Khem Basin Coals

2021 ◽  
Vol 62 (11) ◽  
pp. 1229-1239
Author(s):  
D.A. Bushnev ◽  
S.A. Ondar ◽  
N.S. Burdel’naya
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Aromatic Hydrocarbons ◽  
Aquatic Vegetation ◽  
Mass Spectrometry Data ◽  
Hydrocarbon Potential ◽  
Gas Liquid Chromatography ◽  
Low Grade ◽  
High Hydrocarbon ◽  
Rock Eval

Abstract —The composition of the organic matter (OM) of coals of the Ulug-Khem Basin has been studied. According to Rock-Eval pyrolysis data, this OM is a type III kerogen, sometimes significantly oxidized. The coal of low-grade metamorphism has a high hydrocarbon potential. Based on the gas–liquid chromatography and chromatography–mass spectrometry data on the distribution of n-alkanes, isoprenoids, polycyclic biomarkers, and aromatic hydrocarbons, we have established the composition of the primary OM of the coals and the grade of OM metamorphism. The primary OM of the coals consists mainly of remains of aquatic vegetation and terrigenous OM. The latter includes conifer remains, which are identified from the presence of 4β(H)-19-norisopimarane in the aliphatic fraction of bitumen and from the domination of retene over cadalene and 6-isopropyl-1-isohexyl-2-methylnaphthalene in the aromatic fraction.

Organic Geochemical Characteristics of Core Samples from Central Primorsk-Emba Province, Precaspian Basin, Kazakhstan

2021 ◽  
Author(s):  
Tolganay Jarassova ◽  
Mehmet Altunsoy
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Organic Matter ◽  
Aromatic Hydrocarbons ◽  
Oil And Gas ◽  
Gas Chromatography Mass Spectrometry ◽  
Type Ii ◽  
Core Samples ◽  
Chromatography Mass Spectrometry ◽  
Potential Type

Abstract The Primorsk-Emba province is one of the main oil and gas region of the Precaspian basin. The resources of the Primorsk-Emba oil and gas region range from 5 to 12 billion tons of oil and from 2 to 6 trillion m³ of natural gas. This study primarily concentrates on investigating the organic geochemistry and petroleum geology characteristics of sedimentary units that generated oil in the central Primorsk-Emba province. 20 core samples taken from the Jurassic units in the western part of the study area are characterized by organic matter amount, hydrocarbon production potential, type of organic matter, maturity of organic matter. According to the Rock-Eval results Jurassic aged rocks generally have a petroleum potential ranging from weak to excellent, the organic matter is between Type II (oil prone), Type II-III (gas-oil prone) and Type III (gas prone), and the degree of maturation is immature-mature stage. Oil extracts were characterized by geochemical methods including Gas Chromatography (GC) and Gas Chromatography–Mass Spectrometry (GC–MS). n-alkanes and isoprenoids were evaluated by High-Resolution Gas Chromatography (GC-HR), aromatic hydrocarbons were evaluated by Low Thermal Mass Gas Chromatography (GC-LTM), terpanes (hopanes), steranes / diasteranes and aromatic hydrocarbons were evaluated by Gas Chromatography-Mass Spectrometry (GC-MS). The GC and GC-MS data obtained, it has been determined whether the paleoenvironment characteristics of the study area, hydrocarbon potential, type of kerogen, maturity level of organic matter and whether it is affected by biodegradation. Distribution of n-alkanes in the GC showed that no biodegradation was observed in analyzed samples, source rock deposited in a marine environment under reducing conditions and an organic matter that occurred were generated by marine carbonates. Based on maturity parameters, studied oils are mature and located on the oil generation window. According to biomarker age parameters C28 / C29 and norcholestane (NCR)/nordiacholestane (NDR) samples are generally Mesozoic (Triassic-Jurassic- Cretaceous) origin, nevertheless there are also levels corresponding to the Paleozoic (Permian) late stages.

Biodegradation of petroleum by Chesapeake Bay sediment bacteria

1976 ◽  
Vol 22 (3) ◽  
pp. 423-428 ◽  
Author(s):  
J. D. Walker ◽  
R. R. Colwell ◽  
L. Petrakis
Keyword(s):  
Mass Spectrometry ◽  
Crude Oil ◽  
Chesapeake Bay ◽  
Aromatic Hydrocarbons ◽  
Gas Liquid Chromatography ◽  
Contaminated Sediment ◽  
Saturated And Aromatic Hydrocarbons ◽  
Acinetobacter Spp ◽  
Sediment Bacteria ◽  
South Louisiana

Chesapeake Bay sediment bacteria from oil-contaminated and oil-free environments were compared for their ability to utilize a South Louisiana crude oil. Preferential solubility, column chromatography, gas–liquid chromatography, and computerized mass spectrometry were used to provide new and useful information regarding biodegradation of fractions and components of the crude oil. Vibrio, Pseudomonas, and Acinetobacter spp. were isolated from the culture inoculated with oil-contaminated sediment, whereas coryneforms and Pseudomonas spp. were isolated from the culture inoculated with oil-free sediment. Microorganisms from the oil-free sediment produced greater quantities of polar n-pentane-insoluble components (asphaltenes) after degradation, whereas microorganisms from the oil-contaminated sediments provided greater degradation of saturated and aromatic hydrocarbons.

Identification of aromatic hydrocarbons in high-boiling fraction of pyrolysis oil by capillary gas-liquid chromatography and mass spectrometry

1982 ◽  
Vol 47 (2) ◽  
pp. 476-494 ◽  
Author(s):  
Jan Novrocík ◽  
Marta Novrocíková ◽  
Antonín Čapek
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Liquid Chromatography ◽  
Aromatic Hydrocarbons ◽  
Boiling Point ◽  
Capillary Gas Chromatography ◽  
Coal Tar ◽  
Normal Pressure ◽  
Gas Liquid Chromatography ◽  
Pyrolysis Oil

Capillary gas chromatography and mass spectrometry have been used for identification of most main high-boiling components of fraction of pyrolysis oil (boiling point 250 to 350° C under normal pressure) especially those boiling above the b.p. of acenaphthene. All methyl homologues of acenaphthene, phenanthrene, some isomeric methylfluorenes, trimethyl- and methylethyl naphthenes, phenylnaphthalenes, dimethylbiphenyls, benzindans, methylbenzindans and other aromatic hydrocarbons have been prepared as standards. In connection with the preparation of some trimethyl- and methylethylnaphthalenes a discussion is presented of the course of chloromethylation and acetylation of 1- and 2-methyl- and 2-ethylnaphthalenes. Content of methyl-homologues of some hydrocarbons (acenaphthene, fluorene, phenanthrene, and anthracene) in the high-boiling fraction of pyrolysis oil has been compared with that present in similar fraction of coal tar.

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