Organic geochemistry of Venezuelan extra-heavy oils

Cassani, Fernando; Eglinton, G.

doi:10.1016/0009-2541(86)90001-x

Cited by 61 publications

(4 citation statements)

References 24 publications

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“…For the remaining samples reportedly Alberta's bitumens are medium mature to mature and Athabasca in particular is mature , 3 Properties for Studied Samples and Their Isolated Asphaltenes crude oil or vacuum residueAPI gravity a % w/w nC7 asphaltene b gross thermal maturityasphaltene response in HTSD c (counts/ng) × 10 -5 Athabasca bitumen 11.3 9.4 mature 3.95 Peace River bitumen 12.0 9.2 mature 3.90 Hamaca extra-heavy oil d 9.1 13.1 medium maturity 3.14 Cotton Creek oil 25.7 2.7 mature 3.34 Bombay high oil 34.6 0.5 e highly mature 2.40 PEMEX light oil 34.2 ≈0.1 e highly mature 2.51 Athabasca vacuum residue 4.1 15.5 mature 3.61 Athabasca visbroken, 24.8% yield 2.1 19.3 high maturity 2.47 Athabasca visbroken, 31.8% yield 3.4 25.0 high maturity 1.91 Athabasca visbroken, 33.3% yield 8.0 29.6 high maturity 1.89 a Estimated from density data determined at 22 °C (typical error: ± 0.3 API units)

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Section: Resultsmentioning

confidence: 99%

High Temperature Simulated Distillation of Athabasca Vacuum Residue Fractions. Bimodal Distributions and Evidence for Secondary “On-Column” Cracking of Heavy Hydrocarbons

et al. 2007

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Decreasing conventional oil reserves and existence of large heavy oil and bitumen reservoirs demand novel and cost-effective production and upgrading schemes. One three sequential steps “visbreaking−adsorption−catalytic steam gasification” upgrading process was recently introduced by the group. Thermal cracked heavy molecules were shown to be key components for improved adsorption over solid sorbents. Characterization of the feedstock and the visbroken products is an important part of the study. In this paper, high temperature simulated distillation (HTSD) characterization is covered. Bimodal and monomodal HTSD chromatographic distributions were observed depending on sample relative abundance of heavy resins and asphaltenes. These polar compounds are responsible for the high temperature chromatographic mode. Secondary “on-column” cracking of heavy petroleum components was observed, however not contributing dramatically to the relative abundance of the chromatographic modes. Changes brought by thermal cracking reactions were observed to change detector responses for asphaltene compounds. It seems that this aspect is related to heteroatomic species affecting the burning properties of asphaltene samples. The abundance of the high temperature chromatographic mode was proposed as a feasible crackability (“visbreakability”) index for bimodal petroleum samples. Also, preliminary findings suggest that the HTSD FID response within the second chromatographic mode can be a general indicator of sample thermal maturity, either induced or geothermal.

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…”

Section: Resultsmentioning

confidence: 99%

High Temperature Simulated Distillation of Athabasca Vacuum Residue Fractions. Bimodal Distributions and Evidence for Secondary “On-Column” Cracking of Heavy Hydrocarbons

et al. 2007

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“…Preliminary trials showed that this purification step is essential to remove metabolic byproducts resulting from HC biodegradation like fatty acids, esters and ketones that co-precipitate with true asphaltenes and generate artifacts during pyrolysis. The washed asphaltenes were Soxhlet extracted from the filters for 2 hours with DCM and about 20mg were transferred dried in glass tubes (100x 6 mm in diameter) for closed mild pyrolysis 15,16 . The tubes were sealed with a flame under nitrogen then placed in a gas chromatograph oven at 320°C for 48 hours.…”

Section: Pyrolysis Of Asphaltenesmentioning

confidence: 99%

Pyrolysis of asphaltenes and biomarkers for the fingerprinting of the Amoco-Cadiz oil spill after 23 years

Oudot

Chaillan

2010

Comptes Rendus. Chimie

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“…Los mayores valores alcanzados para este parámetro corresponden a las muestras CB, MO, y ME, Figura 1b. La relación entre 23/21 tricíclicos, también ha sido propuesta como parámetro indicador de evolución térmica 15 y fue usada en el presente estudio, por el hecho que estos compuestos presentan mayor resistencia al proceso de biodegradación. En base a este parámetro se presentan como las muestras más maduras CB, LB1 y FS, Tabla 1, no puede decirse que exista mucha consistencia entre los resultados obtenidos en las dos variantes a no ser por la muestra CB.…”

Section: Resultados Y Discusiónunclassified