Effectiveness of nitrogen compound indices of oil-bearing sandstone extracts

ZHU Nan; WANG Aiguo; GUO Kai; WU Chunyan; LI Chunyu; YANG Zeguang; HE Sensen

doi:10.11781/sysydz202402393

Volume 46 Issue 2

Mar. 2024

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ZHU Nan, WANG Aiguo, GUO Kai, WU Chunyan, LI Chunyu, YANG Zeguang, HE Sensen. Effectiveness of nitrogen compound indices of oil-bearing sandstone extracts[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(2): 393-401. doi: 10.11781/sysydz202402393

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ZHU Nan, WANG Aiguo, GUO Kai, WU Chunyan, LI Chunyu, YANG Zeguang, HE Sensen. Effectiveness of nitrogen compound indices of oil-bearing sandstone extracts[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(2): 393-401. doi: 10.11781/sysydz202402393

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Effectiveness of nitrogen compound indices of oil-bearing sandstone extracts

doi: 10.11781/sysydz202402393

ZHU Nan^{1, 2
,},
WANG Aiguo^{1, 2
,
,},
GUO Kai^{1, 2},
WU Chunyan³,
LI Chunyu^{1, 2},
YANG Zeguang^{1, 2},
HE Sensen^{1, 2}

1.
Department of Geology, Northwest University, Xi'an, Shaanxi 710069, China
2.
State Key Laboratory of Continental Dynamics, Northwest University, Xi'an, Shaanxi 710069, China
3.
Research Institute of Yanchang Petroleum(Group) Co. Ltd., Xi'an, Shaanxi 710075, China

Received Date: 2023-05-15
Rev Recd Date: 2024-02-18
Publish Date: 2024-03-28

Abstract

Abstract

Reports on the utilization of nitrogen compounds to trace oil and gas migration in oil-scarce regions are limited. This scarcity can be attributed to the lack of clarity regarding the effectiveness of nitrogen compound indices in oil-bearing sandstone extracts. To address this knowledge gap, two sets of experiments were designed, encompassing five extraction methods, to evaluate the validity of nitrogen compound indices. The results showed that as the extraction intensity increased, the ratios of 1-/4-methylcarbazole and 1, 8-/2, 7-dimethylcarbazole in the extracts gradually decreased but remained consistently elevated compared to the control oils. The benzocarbazole [a]/[c] ratio remained relatively stable and closely aligned with the control oils. Upon analysis, it was concluded that the observed variations could be attributed to the differing adsorption capacities of carbazole isomers. These differences lead to the fractionation of carbazole isomers between free and adsorbed hydrocarbons under surface conditions, as well as between the extracts and rocks during the extraction process. In comparison to 1-/4-methylcarbazole and 1, 8-/2, 7-dimethylcarbazole, the benzocarbazole [a]/[c] ratio is less susceptible to these two fractionations, with its variations primarily governed by migration fractionation. Additionally, the indicated direction of oil and gas migration aligns with geological realities. Therefore, the benzocarbazole [a]/[c] ratio can be considered an effective nitrogen compound index in oil-bearing sandstone extracts, suitable for oil migration tracing studies in oil-scarce regions.
- nitrogen compound,
- extraction experiment,
- extract,
- oil-bearing sandstone,
- petroleum migration,
- petroleum geochemistry

All authors disclose no relevant conflict of interests.
The study was designed by ZHU Nan, WANG Aiguo and WU Chunyan. The sample collection and experimental operation were completed by GUO Kai, LI Chunyu, YANG Zeguang and HE Sensen. The manuscript was drafted and revised by ZHU Nan and WANG Aiguo. All the authors have read the last version of paper and consented for submission.

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References(33)

References

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Effectiveness of nitrogen compound indices of oil-bearing sandstone extracts

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