塔里木盆地柯坪周缘地区肖尔布拉克组白云岩孔隙结构全孔径表征
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TE311

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中国科学院战略性先导科技专项(A类)项目(XDA14010302);国家重点研发计划(2017YFC0603104)


Full Pore Size Characterization of Dolomite Pore Structure of Xiaolbulake Formation in the Peripheral Area of Keping, Tarim Basin
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Strategic Priority Research Program of CAS, No.XDA14010302;National Key Research and Development Program, No.2017YFC0603104

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    摘要:

    白云岩全孔径的孔隙结构特征难以在单一实验手段分析中得到表达,高压压汞实验和微米CT扫描实验在表征低渗透碳酸盐岩储层的微观孔隙结构时存在局限性。为了解决这一问题,更加精细地刻画孔喉分布特征,以塔里木盆地柯坪周缘地区露头肖尔布拉克组白云岩储层为例,提出了多方法协同表征多尺度孔径孔喉结构的方法。1.采用传统拼接方法,联合高压压汞和微米CT实验结果,通过相同孔径条件下流过孔隙结构的流体体积变化相等的拼接原理确定不同岩性样品的拼接点位置,进而确定完整孔隙大小。2.由于分形维数是定量表征孔隙结构的重要参数,根据碳酸盐岩孔隙结构的多重分形特征,提出分形拼接的方法,分析分形维数相近、孔隙结构相似的孔径尺度。结果显示:结合传统拼接的融合点验证分形拼接的有效性,岩心样品的全孔径传统融合点均处于分形拼接段范围内,多尺度孔径表征范围扩大0.015-1417.128um;分形拼接后亦可得到总分形维数表征多尺度孔径整体的孔隙结构特征。

    Abstract:

    It is difficult to express the pore structure characteristics of dolomite in a single experimental method. High pressure mercury injection test and micrometer CT scan test have limitations in characterizing the microscopic pore structure of low permeability carbonate reservoir. In order to solve this problem and characterize the distribution characteristics of pore-throat more precisely, a multi-scale method was proposed to characterize the pore-throat structure of the dolomite reservoir in the Xiaolbulake Formation outcrop in the peripheral area of Keping, Tarim Basin.1. The traditional splicing method, combined with the experimental results of high-pressure mercury injection and micron CT, is adopted to determine the complete pore size and the location of splicing points of samples of different lithologies through the splicing principle that the volume of fluid flowing through the pore structure changes equally under the condition of the same aperture.2. Because quantitative characterization of pore structure has fractal dimension, on the basis of multi-fractal characteristics of carbonate pore structure, a fractal Mosaic method is proposed to analyze pore size scales with similar fractal dimension and pore structure.The results showed that the fusion points of the traditional splicing were used to verify the effectiveness of fractal splicing. The traditional fusion points of the full pore diameter of the core samples were all within the range of the fractal splicing segment, and the characterization range of the multi-scale pore diameter was expanded by 0.0015-1417.1283um.After fractal splicing, the total fractal dimension can be obtained to represent the overall pore structure characteristics of multi-scale pores.

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柳青兵,蔡忠贤,薛玉芳,等. 塔里木盆地柯坪周缘地区肖尔布拉克组白云岩孔隙结构全孔径表征[J]. 科学技术与工程, 2022, 22(13): 5213-5221.
Liu Qingbing, Cai Zhongxian, Xue Yufang, et al. Full Pore Size Characterization of Dolomite Pore Structure of Xiaolbulake Formation in the Peripheral Area of Keping, Tarim Basin[J]. Science Technology and Engineering,2022,22(13):5213-5221.

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  • 收稿日期:2021-04-29
  • 最后修改日期:2022-03-26
  • 录用日期:2021-11-22
  • 在线发布日期: 2022-05-20
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