Abstract
The relationship between crude oil and source rocks has contributed to oil exploration. The fine analysis of oil source correlation can be better to distinguish source rocks from crude oil by parent source of organic matter, depositional environment, and maturity. Through the experimental analysis of carbon isotopes, MH carbon isotopes, and biomarkers of Chang 7 and Chang 9 source rocks and Chang 10 reservoir extracts, multiple oil source correlation indexes are optimized to determine the relationship between the source rocks and crude oil by the quantitative method. The results show that the MH carbon isotopes, pristane/phytane (Pr/Ph), diahopane/C30hopane (DiaH/C30H), diasterane/sterane (DiaT/Ste), and the gammacerane index can distinguish Chang 7 and Chang 9 source rocks from Chang 10 crude oil. Among them, Pr/Ph and DiaH/C30H can better distinguish source rocks from crude oil. The MH carbon isotopes, Pr/Ph, DiaH/C30H, DiaT/Ste, and the gammacerane index of Chang 10 crude oil in the study area are consistent with those of Chang 7 source rock, indicating that Chang 10 crude oil may migrate from the Chang 7 source rock. However, Chang 10 crude oil is more likely to migrate from the Chang 7 source rock in the central of the basin rather than the local Chang 7 source rock, because the local Chang 9 source rock products affect the oil source correlation indexes of Chang 10 crude oil.
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Abbreviations
- MH:
-
monomer hydrocarbon
- Pr/Ph:
-
pristane/phytane
- DiaH/C30H:
-
diahopane/C30hopane
- DiaT/Ste:
-
diasterane/sterane
- OEP:
-
odd-even predominance
- CPI:
-
carbon preferential index
- GC-MS:
-
gas chromatography-mass spectrometer
- MS:
-
mass spectrometer
- EA:
-
elemental analyzer
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Funding
Funding for this research was supported by the National Natural Science Foundation of China (41872165; 42072185) and Science and Technology Cooperation Project of the CNPC-SWPU Innovation Alliance (2020CX030000; 2020CX050000).
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Xu, K., Chen, S., Hou, Y. et al. Optimization of oil source correlation indexes: a case of Chang 10 member in Ordos Basin’ Zhoujiawan area. Arab J Geosci 14, 2145 (2021). https://doi.org/10.1007/s12517-021-08446-9
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DOI: https://doi.org/10.1007/s12517-021-08446-9