石油勘探与开发 >

2019 , Vol. 46 >Issue 3: 569 - 579

DOI: https://doi.org/10.11698/PED.2019.03.15

油气田开发

孔隙尺度各向异性与孔隙分布非均质性对多孔介质渗透率的影响机理

  • 李滔 ,
  • 李闽 ,
  • 荆雪琪 ,
  • 肖文联 ,
  • 崔庆武
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  • 1. 西南石油大学油气藏地质及开发工程国家重点实验室,成都 610500;
    2. 中石化新星（北京）新能源开发有限公司四川分公司,成都 610500;
    3. 中石化中原石油工程有限公司钻井一公司,河南濮阳 457000
李滔（1991-）,男,四川南充人,西南石油大学在读博士研究生,主要从事油气渗流机理研究。地址：四川省成都市新都区新都大道8号,西南石油大学油气藏地质及开发工程国家重点实验室,邮政编码：610500。E-mail: 734492538@qq.com

收稿日期: 2018-08-13

  修回日期: 2018-11-05

  网络出版日期: 2019-05-25

基金资助

国家自然科学基金联合项目“致密气多相多尺度流动规律及跨尺度耦合渗流”（U1562217）; 国家重点基础研究计划（973计划）项目“陆相致密油高效开发基础研究”（2015CB250900）; 国家自然科学基金重点项目“致密气藏储层干化、提高气体渗流能力的基础研究”（51534006）

收起

Influence mechanism of pore-scale anisotropy and pore distribution heterogeneity on permeability of porous media

  • LI Tao ,
  • LI Min ,
  • JING Xueqi ,
  • XIAO Wenlian ,
  • CUI Qingwu
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  • 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. Sinopec Star Beijing New Energy Development Co., Ltd. Sichuan Branch, Chengdu 610500, China;
    3. No.1 Drilling Company of Sinopec Zhongyuan Petroleum Engineering Co., Ltd., Puyang 457000, China

Received date: 2018-08-13

  Revised date: 2018-11-05

  Online published: 2019-05-25

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摘要

借助微CT扫描实验,建立致密砂岩的三维数字岩心,定量评价孔隙尺度各向异性和孔隙分布非均质性;采用四参数随机生成算法,构建三维各向异性、非均质性多孔介质模型,同时运用多弛豫时间格子-玻尔兹曼模型分析多孔介质渗透率与孔隙尺度各向异性、孔隙分布非均质性的关系,研究对岩心渗透率的微观影响机理。研究表明,致密砂岩孔隙形态复杂,孔隙尺度各向异性、孔隙分布非均质性显著,各向异性因子具有明显的方向性;孔隙尺度各向异性影响多孔介质中孔隙长轴的取向性及流体流动路径,沿各向异性因子大的方向迂曲度小、流体流动消耗能量小,迂曲度与各向异性的强相关是各向异性影响渗透率的根本原因;孔隙分布非均质性对渗透率的影响表现为迂曲度与比表面积的共同作用,比表面积与迂曲度的乘积与非均质性呈明显负相关,孔隙分布非均质性越强,乘积值越小,渗透率越大;复杂多孔介质的渗透率与迂曲度满足乘幂关系式,拟合精度较高,可用于岩心渗透率的近似估算。图19表5参39

关键词： 致密砂岩; 孔隙尺度各向异性; 孔隙分布; 比表面积; 迂曲度; 渗透率; 影响机理

本文引用格式

李滔 , 李闽 , 荆雪琪 , 肖文联 , 崔庆武 . 孔隙尺度各向异性与孔隙分布非均质性对多孔介质渗透率的影响机理[J]. 石油勘探与开发, 2019 , 46(3) : 569 -579 . DOI: 10.11698/PED.2019.03.15

Abstract

Based on micro-CT scanning experiments, three-dimensional digital cores of tight sandstones were established to quantitatively evaluate pore-scale anisotropy and pore-distribution heterogeneity. The quartet structure generation set method was used to generate three-dimensional anisotropic, heterogeneous porous media models. A multi-relaxation-time lattice Boltzmann model was applied to analyze relationships of permeability with pore-scale anisotropy and pore distribution heterogeneity, and the microscopic influence mechanism was also investigated. The tight sandstones are of complex pore morphology, strong anisotropy and pore distribution heterogeneity, while anisotropy factor has obvious directivity. The obvious anisotropy influences the orientation of long axis of pores and fluid flow path, making tortuosity smaller and flowing energy loss less in the direction with the greater anisotropy factor. The strong correlation of tortuosity and anisotropy is the inherent reason of anisotropy acting on permeability. The influence of pore distribution heterogeneity on permeability is the combined effects of specific surface area and tortuosity, while the product of specific surface area and tortuosity shows significantly negative correlation with heterogeneity. The stronger the pore distribution heterogeneity, the smaller the product and the greater the permeability. In addition, the permeability and tortuosity of complex porous media satisfy a power relation with a high fitting precision, which can be applied for approximate estimation of core permeability.

Key words： tight sandstone; pore-scale anisotropy; pore distribution; specific surface area; tortuosity; permeability; influence mechanism

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