Determination of accumulation periods and relative maturity of tight oil and gas in Gaotaizi oil reservoir of Qijia area by using fluorescence spectrum of oil inclusions

doi:10.3969/j.issn.1672-7703.2018.06.009

Abstract

Abstract: Based on the fluorescence property of petroleum, the conventional fluorescence spectroscopy was adopted to quantitatively describe the fluorescence spectrum of oil inclusions. The hydrocarbon charging events can be identified conveniently and effectively based on its attribute parameters (e.g. main peak wave length (λ_max), red-green entropy (Q) and QF₅₃₅) and the relationship between λ_max and QF₅₃₅. 9 samples of fluid inclusions taken from Gaotaizi tight oil reservoir of Qingshankou Formation, Upper Cretaceous in Qijia area were tested. It is indicated that the oil inclusions of three fluorescent colors (i.e., yellow, yellow-green and blue-green) are developed in Gaotaizi oil reservoir. λ_max and QF₅₃₅ of oil inclusions in Gaotaizi oil reservoir are distributed in three regions. The QF₅₃₅ decreases gradually from yellow fluorescence region to yellow-green fluorescence region and to blue-green fluorescence region, reflecting the gradual increase of the maturity of crude oil entrapped in oil inclusions. Then, combined with the studies on burial history, hydrocarbon generation history and homogeneous temperature of inclusions, it is concluded that Gaotaizi oil reservoir in Qijia area has experienced 3 hydrocarbon charging events in the period of geological history. The early charging of crude oil occurred in the late stage of Cretaceous Nenjiang (79-77 Ma), corresponding to the first event of charging, and the late charging occurred in the Mingshui period of Late Cretaceous (69-65 Ma), corresponding to the second and third events of charging.

Key words: oil inclusion, fluorescence spectrum, Qijia area, hydrocarbon accumulation period, tight oil reservoir

CLC Number:

Si Shanghua, Zhao Jingzhou, Liu Junbang, Zhang Yupan, Wu Weitao, Li Jun. Determination of accumulation periods and relative maturity of tight oil and gas in Gaotaizi oil reservoir of Qijia area by using fluorescence spectrum of oil inclusions[J]. China Petroleum Exploration, 2018, 23(6): 78-86.

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