查干凹陷中央构造带不同断阶带原油成熟度特征差异及其成因分析

doi:10.13278/j.cnki.jjuese.201704107

Abstract

Abstract: The central structural belt of Chagan Sag is cut into several fault steps by the Barun fault system, and the oil bearing range in western fault steps is larger than that in the eastern fault steps. The oil CPI in the western fault steps is higher than 1.20, OEP higher than 1.30, Pr/Ph lower than 0.60, and Ph/nC₁₈ higher than 1.00; while the oil CPI and OEP in the eastern fault steps are lower than 1.20, Pr/Ph higher than 0.60, and Ph/nC₁₈ lower than 1.00, indicating the oil maturity is high in the western fault steps. The regular sterane distribution and maturity demonstrate that the oil in the western fault steps was derived from source rocks in the central structure belt; while the oil in the eastern fault steps was derived from source rocks in Hule sub-sag. Internal structures of the fault zones were analyzed using drilling and logging data, and the results reveal that the fault zones are composed of central sliding breaking zones and their induced fractures zones. The sealing capacity of the central sliding breaking zones is better than that of the induced as a result of low permeability. The tight sliding breaking zone is steadily distributed based on a seismic velocity data analysis on the fault that separates the western and eastern fault steps. The faults were active during the deposition of the second member of Suhongtu Formation according to the fault activity analysis. SGR values of the faults are greater than 25%, indicating their excellent sealing capacity. Hydrocarbons accumulated in k₁s²-k₁y according to the result of source rock generation history modeling and fluid inclusion analysis. Since the activity of Barun 3 fault was weak during the hydrocarbon accumulation period and the tight sliding breaking zone is steadily distributed, hydrocarbons expulsed from the Hule sub-sag cannot migrate to the western fault steps. Different source rocks led to the maturity difference of crude oil in different fault steps.

Key words: Chagan sag, maturity of oil, fault structure, fault activity, hydrocarbon accumulation model

CLC Number:

TE122.3

Niu Zicheng, Liu Guangdi, Guo Dianbin, Wang Peng, Zhang Jialing, Zhao Qilei. Maturity Difference of Crude Oil and Its Cause Analysis Between Different Fault Steps in the Central Structural Belts of Chagan Sag[J].Journal of Jilin University(Earth Science Edition), 2017, 47(4): 1047-1059.

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Maturity Difference of Crude Oil and Its Cause Analysis Between Different Fault Steps in the Central Structural Belts of Chagan Sag

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