Key geochemical evidence of "near-source accumulation" of tight oil: a case study of near-source assemblage of Triassic Yanchang Formation in Ordos Basin

XIAO Zhenglu; LI Yong; YU Jian; ZHANG Hai; LU Jungang; YIN Xiangdong; HAN Meimei

doi:10.11781/sysydz202303517

Volume 45 Issue 3

May 2023

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XIAO Zhenglu, LI Yong, YU Jian, ZHANG Hai, LU Jungang, YIN Xiangdong, HAN Meimei. Key geochemical evidence of 'near-source accumulation' of tight oil: a case study of near-source assemblage of Triassic Yanchang Formation in Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(3): 517-527. doi: 10.11781/sysydz202303517

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XIAO Zhenglu, LI Yong, YU Jian, ZHANG Hai, LU Jungang, YIN Xiangdong, HAN Meimei. Key geochemical evidence of "near-source accumulation" of tight oil: a case study of near-source assemblage of Triassic Yanchang Formation in Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(3): 517-527. doi: 10.11781/sysydz202303517

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Key geochemical evidence of "near-source accumulation" of tight oil: a case study of near-source assemblage of Triassic Yanchang Formation in Ordos Basin

doi: 10.11781/sysydz202303517

XIAO Zhenglu^{1, 2, 3
,},
LI Yong^{1, 2, 3
,
,},
YU Jian⁴,
ZHANG Hai⁵,
LU Jungang^{1, 2, 3},
YIN Xiangdong^{1, 2, 3},
HAN Meimei^{1, 2, 3}

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2.
Natural Gas Geology Key Laboratory of Sichuan Province, Southwest Petroleum University, Chengdu, Sichuan 610500, China
3.
School of Geosciences and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China
4.
PertoChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China
5.
Yanchang Oilfield Company, PetroChina, Yan'an, Shaanxi 716000, China

Received Date: 2022-09-05
Rev Recd Date: 2023-04-14
Publish Date: 2023-05-28

Abstract

Abstract

The conclusion of "near-source accumulation" of tight oil is inferred based on the reservoir characte-ristics that crude oil is difficult to migrate laterally for a long distance in low-permeability reservoirs, yet there has been no direct geochemical evidence for a long time. Based on the analysis of the characteristics of source rocks and the source differences of oil in the near-source assemblage (Chang 6 member to Chang 8₁ sub-member) of the Tirassic Yanchang Formation in the Ordos Basin, this paper explores the geochemical basis of tight oil near-source accumulation and explains its cause. The results show that the crude oil in the near-source assemblage comes from the in-situ Chang 7 source rocks, and even the oil sources in the adjacent blocks are different. It is difficult for crude oil to undergo large-scale lateral migration in a tight reservoir. The biomarker compounds of Chang 7 source rocks in the Ordos Basin have significant differences in the plane and are distributed in a circularbelt along the sedimentary center. The oil source difference caused by the combination difference ofbiomarker compounds in different facies zones is the fundamental reason for the predecessors' discovery of "near-source accumulation" of tight oil. The "near-source accumulation" of tight oil has changed the previous view that oilsource correlation is a generalization of the whole basin and the source rocks of the same layer, and has important significance for the zoning and fine evaluation of different types of oil and gas resources in a single basin in the future.
- near-source accumulation,
- tight oil,
- oil-source correlation,
- Yanchang Formation,
- Triassic,
- Ordos Basin

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References

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Key geochemical evidence of "near-source accumulation" of tight oil: a case study of near-source assemblage of Triassic Yanchang Formation in Ordos Basin

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Key geochemical evidence of "near-source accumulation" of tight oil: a case study of near-source assemblage of Triassic Yanchang Formation in Ordos Basin

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