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首页> 外文期刊>Energy & fuels >Comparative Studies of Three Nonfractured Unconventional Sandstone Reservoirs with Superlow Permeability: Examples of the Upper Triassic Yanchang Formation in the Ordos Basin, China
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Comparative Studies of Three Nonfractured Unconventional Sandstone Reservoirs with Superlow Permeability: Examples of the Upper Triassic Yanchang Formation in the Ordos Basin, China

机译：三种超低渗透非裂隙非常规砂岩储层的对比研究：以鄂尔多斯盆地上三叠统延长组为例

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摘要

Unconventional sandstone reservoirs with ultralow permeability (1 mD < K-air < 10 mD, where K-air, represents the permeability in air) and superlow permeability (0.1 mD < K-air < 1 mD) in China are widely distributed in major basins and have significant economic potential. (Here, D is a permeability unit: 1D = 1000mD = 1 mu m(2)) A comparative study has been, performed here on three Upper Triassic sandstone reservoirs with superlow permeability in the southern Ordos Basin to understand,the characteristics of each reservoir, the differences in reservoir porosity and permeability, and their causes. The study shows that pore type is the main factor that controls the physical property of nonfractured, superlow permeability sandstone reservoirs in the area of study. The main pore type observed in all three reservoirs is dissolution-enhanced intergranular, which comprises a maximum of 70% of the total porosity. Remnant intergranular and intragranular dissolution pores are also observed in these reservoirs. The pore throat size of dissolution-enhanced intergranular pores is generally 2-3 times larger than that of the intragrantilar dissolution type. Therefore, the reservoir with the greatest quantity of dissolution-enhanced intergranular pores has a poorer sorting of, ore throat sizes and stronger microscopic heterogeneity. The dissolution-enchariced intergranular pores, on the other hand, also contribute to higher surface porosity, larger average pore diameter, higher pore throat coordination value; and, most importantly, higher permeability. This latter result contrasts with observations of conventional sandstone reservoirs, hi which better pore throat sorting is favored for permeability.
机译：中国非常规的超低渗透率（1 mD

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  • 来源
    《Energy & fuels》 |2017年第1期|107-118|共12页
  • 作者

    Wang Ruifei; Xu Guangjian; Wu Xuguang; Liu Zhongqun; Chi Yungang;

  • 作者单位

    Xian Shiyou Univ, Coll Petr Engn, Xian 710065, Peoples R China;

    Texas A&M Univ, Dept Geol & Geophys, College Stn, TX 77843 USA;

    Sinopec North China Co, Zhengzhou 450006, Peoples R China;

    Sinopec North China Co, Zhengzhou 450006, Peoples R China;

    Xian Shiyou Univ, Coll Petr Engn, Xian 710065, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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