准噶尔盆地三叠系百口泉组特低渗砂砾岩储层孔喉结构定量表征

doi:10.3969/j.issn.1006-6535.2021.04.004

摘要/Abstract

摘要： 针对特低渗砂砾岩储层非均质性强、孔喉结构复杂、定量表征难度大等问题,综合应用铸体薄片观察、常规压汞和恒速压汞等技术对准噶尔盆地三叠系百口泉组特低渗砂砾岩储层孔喉结构进行研究。结果表明:储层非均质性强,砾岩含量超过50%,孔喉分选系数为1.10～3.60,平均为1.97;储层平均孔隙半径和平均喉道半径分别为127.80、0.25 μm,主流喉道半径为0.71～1.12 μm,平均为0.91 μm;对于微观孔喉非均质性较强的砂砾岩储层,主流喉道半径应作为衡量砂砾岩储层渗流能力的最重要指标。建议采用“水平井+体积压裂”方式提高储量动用程度和单井产量,采用气驱和注气吞吐提高采收率。该研究定量认识了特低渗砂砾岩储层孔喉结构特征,为开发对策的制订指明了方向。

关键词: 砂砾岩储层, 孔喉结构, 压汞实验, 主流喉道半径, 准噶尔盆地

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

中图分类号:

TE122

张代燕, 户海胜, 王英伟. 准噶尔盆地三叠系百口泉组特低渗砂砾岩储层孔喉结构定量表征[J]. 特种油气藏, 2021, 28(4): 23-29.

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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