Quantitative Characterization of Pore Throat Structure of Glutenite Reservoir with Extra-low Permeability in Triassic Baikouquan Formation in Junggar Basin

doi:10.3969/j.issn.1006-6535.2021.04.004

Abstract

Abstract: In view of the strong heterogeneity, complex pore throat structure and great difficulty in quantitative characterization of glutenite reservoir with extra-low permeability, the pore throat structure of glutenite reservoir with extra-low permeability in Triassic Baikouquan Formation in Junggar Basin was studied with cast sheet observation, conventional mercury injection and mercury injection at constant rate. The results showed that the reservoir heterogeneity was high, the conglomerate content was more than 50%, the pore throat sorting coefficient was from 1.10 to 3.60, with an average of 1.97; the average pore radius and average throat radius of the reservoir were 127.80 μm and 0.25 μm, respectively, and the mainstream throat radius ranged from 0.71 μm to 1.12 μm, with an average of 0.91 μm; for glutenite reservoirs, the mainstream throat radius was an important indicator to characterize the permeability of the reservoir. It is recommended to improve the reservoir development degree and single well production with "horizontal well + fracturing by stimulated reservoir volume", and to enhance the oil recovery with gas flooding and stimulation by gas injection.

Key words: glutenite reservoir, pore throat structure, mercury injection test, mainstream throat radius, Junggar Basin

CLC Number:

TE122

Zhang Daiyan, Hu Haisheng, Wang Yingwei. Quantitative Characterization of Pore Throat Structure of Glutenite Reservoir with Extra-low Permeability in Triassic Baikouquan Formation in Junggar Basin[J]. Special Oil & Gas Reservoirs, 2021, 28(4): 23-29.

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