石油勘探与开发 >

2021 , Vol. 48 >Issue 2: 368 - 378

DOI: https://doi.org/10.11698/PED.2021.02.13

油气田开发

不规则微裂缝网络定量表征及其对多孔介质渗流能力的影响

  • 李滔 ,
  • 李骞 ,
  • 胡勇 ,
  • 彭先 ,
  • 冯曦 ,
  • 朱占美 ,
  • 赵梓寒
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  • 1.中国石油西南油气田公司勘探开发研究院,成都 610041;
    2.清华大学工程力学系,北京 100084;
    3.中国石油西南油气田公司,成都 610051
李滔（1991-）,男,四川南充人,博士,主要从事油气渗流机理方面的研究工作。地址：四川省成都市高新区天府大道北段12号,中国石油西南油气田公司勘探开发研究院,邮政编码：610041。E-mail: 734492538@qq.com

收稿日期: 2020-06-27

  修回日期: 2021-02-02

  网络出版日期: 2021-03-19

基金资助

中国石油重大科技专项“西南油气田天然气上产300亿立方米关键技术研究与应用”（2016E-0606）; 国家自然基金联合项目“致密气多相多尺度流动规律及跨尺度耦合渗流”（U1562217）

收起

Quantitative characterization of irregular micro-fracture network and its effect on the permeability of porous media

  • LI Tao ,
  • LI Qian ,
  • HU Yong ,
  • PENG Xian ,
  • FENG Xi ,
  • ZHU Zhanmei ,
  • ZHAO Zihan
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  • 1. Exploration and Development Research Institute, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China;
    2. Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;
    3. PetroChina Southwest Oil & Gas Field Company, Chengdu 610051, China

Received date: 2020-06-27

  Revised date: 2021-02-02

  Online published: 2021-03-19

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摘要

基于对储集层岩石微裂缝和基质孔隙特征的认识,采用数值算法构建裂缝性多孔介质和裂缝-孔隙性多孔介质模型,引入裂缝网络连通系数和走向因子定量表征微裂缝网络连通性和走向,以揭示微裂缝网络对岩石渗透率的影响机理。采用多弛豫时间格子-玻尔兹曼模型模拟流体渗流,研究裂缝开度、裂缝网络走向和裂缝网络连通性对多孔介质渗流能力的影响。研究表明,裂缝网络走向因子越大,裂缝性多孔介质迂曲度越小,渗透率越大;裂缝网络连通系数越大,裂缝-孔隙性多孔介质渗透率越大,越易出现优势通道效应,且裂缝网络连通性对裂缝-孔隙性多孔介质渗流能力的影响大于裂缝开度和裂缝网络走向;裂缝性多孔介质的迂曲度与裂缝网络走向因子呈多项式关系式,裂缝-孔隙性多孔介质的渗透率与裂缝网络连通系数满足指数关系式。图19表3参33

关键词： 微裂缝; 裂缝网络连通性; 裂缝网络走向; 格子-玻尔兹曼模型; 渗透率

本文引用格式

李滔 , 李骞 , 胡勇 , 彭先 , 冯曦 , 朱占美 , 赵梓寒 . 不规则微裂缝网络定量表征及其对多孔介质渗流能力的影响[J]. 石油勘探与开发, 2021 , 48(2) : 368 -378 . DOI: 10.11698/PED.2021.02.13

Abstract

Based on the comprehensive understanding on micro-fractures and matrix pores in reservoir rocks, numerical algorithms are used to construct fractured porous media and fracture-pore media models. Connectivity coefficient and strike factor are introduced into the models to quantitatively characterize the connectivity and strike of fracture network, respectively. The influences of fracture aperture, fracture strike and fracture connectivity on the permeability of porous media are studied by using multi-relaxation-time lattice Boltzmann model to simulate fluid flow in them. The greater the strike factor and the smaller the tortuosity of the fractured porous media, the greater the permeability of the fractured porous media. The greater the connectivity coefficient of the fracture network is, the greater the permeability of the fracture-pore media is, and the more likely dominant channel effect occurs. The fracture network connectivity has stronger influence on seepage ability of fracture-pore media than fracture aperture and fracture strike. The tortuosity and strike factor of fracture network in fractured porous media are in polynomial relation, while the permeability and fracture network connectivity coefficient of the fracture-pore media meet an exponential relation.

Key words： micro-fracture; fracture network connectivity; fracture network strike; lattice Boltzmann model; permeability

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