POTENTIAL THERMAL MATURITY PARAMETERS ASSOCIATED WITH AROMATIC HYDROCARBONS IN LIGHT CRUDE OILS

2021 ◽  
Author(s):  
Z. Wei ◽  
H. Deng ◽  
S. Li ◽  
H. Wang ◽  
Q. Deng ◽  
...  
Keyword(s):  
Aromatic Hydrocarbons ◽  
Crude Oils ◽  
Thermal Maturity ◽  
Maturity Parameters

scholarly journals Aromatic Hydrocarbons as Indicators of Maturation and Source: Correlative Geochemical Evaluation of Commingled Niger Delta Crude Oils

2020 ◽  
Vol 4 (2) ◽  
pp. 1-9
Author(s):  
Onyema MO
Keyword(s):  
Crude Oil ◽  
Aromatic Hydrocarbons ◽  
Niger Delta ◽  
Higher Plants ◽  
Source Rocks ◽  
Crude Oils ◽  
Relative Distribution ◽  
Geochemical Parameters ◽  
The Individual ◽  
Maturity Parameters

Two Niger Delta crude oils from Rivers and Delta States (samples A and F) and their compositional mixtures (samples B, C, D and E) where evaluated using a range of geochemical parameters derived from aromatic hydrocarbons and aromatic sulphur compounds to determine their source and maturity. The relative distribution of various plant markers in crude oil samples A and F which were retained in their compositional mixes suggests the contribution of angiosperm higher plants and coniferous higher plants to the source rocks that generated the crude oils. The various maturity parameters computed for the oil samples revealed that both the Rivers and Delta crude oils lie in the high maturity state with sample F significantly more matured than sample A. All alkynaphthalene maturity parameters suggested a peak to late oil generation window for the crude oil samples except the methyl naphthalene ratio (MNR) whose maturity sequence lacks sufficient variation to distinguish maturity differences in the crude oil samples. The maturity characters of TNR-1 and TNR-2 (trimethylnaphthalene ratio) showed a strong correlation between the individual crude oil samples and their mixtures. However, all the other maturity parameters showed moderate or weak correlation between the individual crude oil samples and their mixtures.

Geochemical Characteristics of Crude Oils from the Tarim Basin by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

2011 ◽  
Vol 29 (6) ◽  
pp. 711-741 ◽  
Author(s):  
Sumei Li ◽  
Xiongqi Pang ◽  
Quan Shi ◽  
Baoshou Zhang ◽  
Haizu Zhang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Fourier Transform ◽  
Cyclotron Resonance ◽  
Sulfur Compounds ◽  
Crude Oils ◽  
Ion Cyclotron Resonance ◽  
Thermal Maturity ◽  
Sulfur Species ◽  
Abnormal Distribution ◽  
Ion Cyclotron

Nine marine and two terrestrial oils from the Tarim Basin in Western China were analyzed by Fourier transform ion cyclotron resonance mass spectrometry. Sulfur compounds with 8–47 carbon atoms and double-bond equivalent (DBE) values of 0–21 are abundant in the crude oils. The most abundant sulfur species in Tazhong marine oils are S1 species (80.57–85.22%), followed by O1S1 (6.95–14.78%) and S2 (0.71–6.69%) species. The dominant species in Yingmaili terrestrial oils are S1 (51.41–52.76%), O1S1 (26.83–35.27%) and O2S1 (11.97–21.76%) species; no S2 species were detected. The results suggest that the sulfur compounds present in oil vary with the oil type. For the S1 and S2 species, as the thermal maturity increased, the degree of condensation increased, and the median and range of the number of carbon atoms decreased. Compounds with DBE values of 9, which are most likely dibenzothiophenes, became concentrated as the thermal maturity increased. Therefore, the unusually high abundance of dibenzothiophenes in the Lower Ordovician oils could be related to the thermal maturity. The TZ83 (O1) oil has an abnormal distribution of S1 species, and is characterized by sulfur species with relatively low DBE values (0–7). This abnormal distribution could be caused by thermochemical sulfate reduction, and a relatively high content of H2S in the associated gases and abundant sulfo-diamantane in the oil supported this theory. In conclusion, the thermal maturity, organic facies, paleoenvironment of the source rock, and possibly thermochemical sulfate reduction have a large impact on the sulfur compounds present in the oils. The O1S1/S1 and S2/S1 ratios could be used as indicators of the precursors/paleoenvironment, and C10–19/C20–50 DBE9 and DBE1,3,6 /DBE9 could be used as indicators of thermal maturity. Fourier transform ion cyclotron resonance mass spectrometry is very useful for detecting sulfur compounds, especially those with high molecular weights, in the crude oils. This technique has potential for determining the formation mechanisms of some unusual oils and the geochemical implications of the sulfur compounds they contain.

Characteristics of aromatic hydrocarbons in crude oils

1994 ◽  
Vol 13 (2) ◽  
pp. 97-106 ◽  
Author(s):  
Luo Binjie ◽  
Li Xinyu
Keyword(s):  
Aromatic Hydrocarbons ◽  
Crude Oils

Petroleomics by Esi(-) Ft-Icr Ms as a Tool to Assess Source and Thermal Maturity of Brazilian Crude Oils

2019 ◽  
Author(s):  
Y.S. Rocha ◽  
A.L.D. Spigolon ◽  
W.L. Bastos ◽  
J.P. Lopes ◽  
F.G. Leal ◽  
...  
Keyword(s):  
Crude Oils ◽  
Thermal Maturity ◽  
Ft Icr Ms ◽  
Ft Icr

scholarly journals Classical Biomarker and Quantitative Extended Diamondoid Analysis Fingerprints for Crude Oils from Deepwater Developments in Block 17, Lower Congo Basin, Angola

2020 ◽  
Vol 17 (19) ◽  
pp. 7204
Author(s):  
Carlos Boente ◽  
Gonzalo Márquez ◽  
Patricia Marín ◽  
Emilio Romero ◽  
Cristina Rodrigues ◽  
...  
Keyword(s):  
Cluster Analysis ◽  
Organic Geochemistry ◽  
Hierarchical Cluster ◽  
Molecular Data ◽  
Congo Basin ◽  
Hydrocarbon Generation ◽  
Thermal Maturity ◽  
Maturity Level ◽  
Oil Type ◽  
Maturity Parameters

The organic geochemistry of six oil samples from the offshore Block 17 (Lower Congo Basin, northwestern Angola) was studied by a combination of classical biomarker and extended diamondoid analyses to elucidate source rock facies, the extent of biodegradation, and thermal maturity. Based on molecular data, oils are interpreted as depicting a mixture of two pulses of hydrocarbon generation probably from the Bucomazi and Malembo formations. Geochemical results also gave evidence of mixing of a lacustrine siliciclastic-sourced oil charge and a second more terrestrially derived oil type in the samples analyzed. A single genetic oil family was identified through hierarchical cluster analysis; however, two groups of oils were identified on the basis of their biodegradation levels using the Peters/Moldowan scale. Lower and upper Malembo oils have a slight depletion and a notable absence of n-alkanes, suggesting PM levels of 1 and 2, respectively. Most molecular maturity parameters of the oil samples suggest a maturity level equivalent to the onset of the peak of the oil generative window.

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