Abundant non-hydrocarbons in crude oils from the western Qaidam Basin, northwest China

Duan, Yi; Qian, Yongchang; Wang, Chuanyuan; Wang, Zhiping; Zhang, Xiaobao; Zhang, Hui; Wu, Baichang; Zheng, Guodong

doi:10.2343/geochemj.38.461

Cited by 5 publications

(4 citation statements)

References 52 publications

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“…The distribution of nalkanes in the studied crude oils exhibits an obviously even carbon predominance and a maximum at C 16 to C 22 . Such distribution of n-alkanes are similar to those of fatty acid, alkanols, fatty acid glycerol monoesters and amide in the crude oils from the Gasikule oilfield reported previously (Duan et al, 2004b). This suggests that n-alkanes in the crude oils were derived probably from the reduced products of these compounds.…”

Section: Crude Oil Genesissupporting

confidence: 62%

“…Their mean steranes C 29 20S/ (20S + 20R) are 0.29, 0.26 and 0.22 (Fig. 2), respectively, and their average depositional palaeosalinity are 16wt%, 19wt% and 20~60wt% (Duan et al, 2004b(Duan et al, , 2006, respectively. As described above, the maturity of the crude oils from the E 3 1 oil pool is slightly higher than that from the N 2 1 oil pool and the depositional paleosalinity of N 2 1 oil source materials is higher that of E 3 1 oil source materials.…”

Section: Crude Oil Genesismentioning

confidence: 99%

“…At the same time, some important contribution of extractable organic matter from the source rocks to the formation of liquid hydrocarbons was confirmed (unpublished data). The studied results of the abundant non-hydrocarbon fraction of immature-low mature crude oils from the western Qaidam Basin show that the non-hydrocarbons are composed primarily of fatty acids, alkanols, fatty acid glycerol monoesters, amide and sterols (Duan et al, 2004b), indicating the crude oils derived mainly from biological lipids. The distribution of nalkanes in the studied crude oils exhibits an obviously even carbon predominance and a maximum at C 16 to C 22 .…”

Section: Crude Oil Genesismentioning

confidence: 99%

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Geochemical characteristics and genesis of crude oils from Gasikule oilfield in Western Qaidam Basin, China

Duan

Wang

et al. 2009

Geochem. J.

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The Gasikule oilfield, including a deep layer E 3 1 and a shallow layer N 2 1 pool, is the largest one in the Qaidam Basin and its crude oil output accounts for 80% of total oil output in the basin. In order to understand the genetic mechanism of crude oils from this oilfield, crude oils from both E 3 1 and N 2 1 pools in the Gasikule oilfield were collected and analyzed using gas chromatography and gas chromatography-mass spectrometry. The geochemical characteristics of biomarkers in the crude oils were synthetically studied. The biomarker compositions indicate that the crude oils were derived from strong anoxic and saline-hypersaline lacustrine environment with a dominance of algal organic matter. It was also observed that the ancient salinity of the sedimentary environments of the source rocks for the N 2 1 crude oils was slightly higher than that for the E 3 1 crude oils. The E 3 1 crude oils were derived mostly from bacteria whereas the N 2 1 crude oils originated mostly from plankton. The maturity parameters of biomarkers reflect that the crude oils were low mature. The maturity of the E 3 1 crude oils was slightly higher than that of the N 2 1 crude oils. These results, together with research of crude oil formation, show that the N 2 and E 3 1 crude oils were yielded from free biological lipids, extractable organic matters and kerogen in the Tertiary source rocks deposited under an anoxic and saline-hypersaline environment at the stage of low maturity.

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Section: Crude Oil Genesissupporting

confidence: 62%

Section: Crude Oil Genesismentioning

confidence: 99%

Section: Crude Oil Genesismentioning

confidence: 99%

See 1 more Smart Citation

Geochemical characteristics and genesis of crude oils from Gasikule oilfield in Western Qaidam Basin, China

Duan

Wang

et al. 2009

Geochem. J.

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“…The deasphalted crude oils and extracts were fractionated by column chromatography on alumina over silica gel (Duan et al, 2004). Saturated hydrocarbons, aromatic hydrocarbons and non-hydrocarbons were obtained by successively eluting with n-hexane, toluene and chloroform/methanol (98:2), respectively.…”

Section: Samples and Analytical Methodsmentioning

confidence: 99%

Geochemical study of crude oils from the Xifeng oilfield of the Ordos basin, China

Duan

Wang

Chen

et al. 2008

Journal of Asian Earth Sciences

156

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Qualitative analysis of phenols and alcohols in complex samples after derivatization to esters of ferrocene carboxylic acid by gas chromatography with mass spectrometric detection

Wasinski

Andersson

2007

Journal of Chromatography A

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Abundant non-hydrocarbons in crude oils from the western Qaidam Basin, northwest China

Cited by 5 publications

References 52 publications

Geochemical characteristics and genesis of crude oils from Gasikule oilfield in Western Qaidam Basin, China

Geochemical characteristics and genesis of crude oils from Gasikule oilfield in Western Qaidam Basin, China

Geochemical study of crude oils from the Xifeng oilfield of the Ordos basin, China

Qualitative analysis of phenols and alcohols in complex samples after derivatization to esters of ferrocene carboxylic acid by gas chromatography with mass spectrometric detection

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