Fluid inclusion characteristics and hydrocarbon accumulation periods of the Bayingebi Formation in Hari sag, Yingen-Ejinaqi Basin

doi:10.3969/j.issn.1672-7703.2019.06.003

Abstract

Abstract: Predecessors have great differences in the understanding of the hydrocarbon accumulation period and time in the Mesozoic in the Yingen-Ejinaqi Basin. Possible causes for these differences are complex geological conditions and different accumulation times in different sags and even in different structural parts of the same sag in the basin. In addition, previous studies are only based on limited samples, so the research conclusions cannot effectively guide exploration. Taking the Hari sag as the research object, samples were taken from the primary oil- bearing intervals (Bayingebi Formation) in different structural parts, and analyzed on ?uid inclusions. All of the samples contain a large number of ?uid inclusions, and the inclusions are hydrocarbon inclusions and brine inclusions. The ?uorescence of the oil inclusions is light blue and light yellow, and the ?uorescence spectral characteristics indicate that there are at least two hydrocarbon ?lling periods with different maturities in the study area. Numerical stimulation to the sedimentary, burial and thermal evolution history of the sampled wells determined the period and time of hydrocarbon accumulation by considering the homogeneous temperature of the brine inclusions coexisting with the hydrocarbon inclusions. In the Bayingebi Formation in Well YHC1drilled in a subsag, two periods of hydrocarbon ?lling occurred at 107104 Ma and 99 Ma, corresponding to the middle deposition of the Suhongtu Formation and the early deposition of the Yingen Formation. In Well H3 in a slope zone, two periods of hydrocarbon ?lling took place at 99 Ma and 7271 Ma, corresponding to the early deposition of the Yingen Formation and the late deposition of the Wulansuhai Formation. In Well H2, in a marginal zone, two periods of hydrocarbon ?lling took place at 85 Ma and 7571 Ma, corresponding to the middle and late deposition of the Wulansuhai Formation. The difference in hydrocarbon accumulation periods in different structural parts of the Hari sag indicates that the secondary migration distance of hydrocarbons generated by the source rocks of the Bayingebi Formation in the study area is extremely limited, and near-source accumulation is dominant.

CLC Number:

Ren Laiyi, He Yonghong, Chen Zhijun, Liu Huchuang, Bai Xiaoyin, Wang Xiaoduo, Han Changchun. Fluid inclusion characteristics and hydrocarbon accumulation periods of the Bayingebi Formation in Hari sag, Yingen-Ejinaqi Basin[J]. China Petroleum Exploration, 2019, 24(6): 709-720.

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