熊繁升^1,,
甘利灯³,
孙卫涛^1,2,,,
杨昊³
1. 清华大学周培源应用数学研究中心, 北京 100084
2. 清华大学航天航空学院, 北京 100084
3. 中国石油集团勘探开发研究院, 北京 100083

基金项目: 国家自然科学基金（41874137）和国家重点研发计划（2018YFA0702501）资助


详细信息

作者简介: 熊繁升, 男, 1991年生, 2016年硕士毕业于中国地质大学(北京), 2020年博士毕业于清华大学, 主要从事孔隙介质波动方程研究.E-mail:hxw1334@126.com

通讯作者: 孙卫涛, 男, 1975年生, 1998年本科毕业于大连理工大学, 2003年在清华大学获博士学位, 主要从事复杂介质波动理论和算法、地震岩石物理模型研究.E-mail:sunwt@tsinghua.edu.cn

中图分类号: P631

收稿日期:2019-05-05
修回日期:2020-10-06
上线日期:2021-01-10

Characterization of reservoir permeability and analysis of influencing factors in fracture-pore media

XIONG FanSheng^1,,
GAN LiDeng³,
SUN WeiTao^1,2,,,
YANG Hao³
1. Zhou Pei-Yuan Center for Applied Mathematics, Tsinghua University, Beijing 100084, China
2. School of Aerospace Engineering, Tsinghua University, Beijing 100084, China
3. Geophysical Department, RIPED, PetroChina, Beijing 100083, China


More Information

Corresponding author: SUN WeiTao,E-mail:sunwt@tsinghua.edu.cn

MSC: P631

--> Received Date: 05 May 2019
Revised Date: 06 October 2020
Available Online: 10 January 2021


摘要
摘要:含裂缝多孔介质渗透率预测是非常规油气资源勘探开发的一个紧迫问题.现有多孔介质岩石物理模型通常利用圆形孔管模拟宏观岩石孔隙空间，难以定量描述软孔隙/裂缝在压力作用下的闭合情况，缺乏裂缝/孔隙间流量交换的连通机制.本文提出含三维裂缝/软孔隙网络多孔介质模型，将储层岩石裂缝/软孔隙表示为椭圆截面微管，建立了周期性压力作用下微观裂缝流量表达式，通过网络模型和流量守恒条件，得到含有三维裂缝/软孔隙网络的多孔介质渗透率计算方法.数值算例表明，预测结果与实验数据分布范围吻合很好，能够给出不同类型岩心对应孔隙纵横比的分布图.三维裂缝/软孔隙网络模型建立了宏观可观测量与裂缝参数之间关系，能够定量分析岩石渗透率随裂缝体密度、纵横比、孔隙流体类型和围压等因素的变化规律，为复杂条件下储层渗透率预测提供了一种有效方法.
关键词: 裂缝/孔隙介质/
渗透率/
三维网络模型/
椭圆截面微管/
流量守恒

Abstract:Permeability prediction of porous media with fractures is an urgent problem in unconventional oil and gas exploration and development. Conventional rock-physics models of porous media usually use circular pore/tubes to simulate macroscopic rock pore space,which is difficult to quantitatively describe the closure of soft pores/fractures under pressure and lacks the connectivity mechanism of flow exchange between fractures/pores. In this paper,a three-dimensional fracture/soft pore network model is proposed. Fractures and soft pores in reservoir rocks are expressed as elliptical cross-section microtubules. The fluid flow velocity field in fracture/pore space is established under the action of periodic pressure. In terms of the network model and the conditions of flow conservation,we establish the permeability calculation method for three-dimensional fracture/soft porous media. Numerical examples show that the predicted results are in good agreement with the distribution range of experimental data. And the distribution of pore aspect ratio corresponding to different types of cores can be predicted. The three-dimensional fracture/soft pore network model establishes the relationship between macroscopic observable measurement and fracture parameters. It is possible now to quantitatively analyze the variation of rock permeability with the racture density,aspect ratio,pore fluid type,confining pressure and other factors,which provides an effective approach to reservoir permeability prediction under complex conditions.
Key words:Fracture/pore media/
Permeability/
Three-dimensional network model/
Elliptical cross-section microtubules/
Flow conservation



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