页岩油藏CO2前置压裂对裂缝网络的影响

崔传智; 钱银; 吴忠维; 王俊康; 张世明; 吕琦; 程紫燕

doi:10.3969/j.issn.1006-6535.2026.02.008

特种油气藏 >

2026 , Vol. 33 >Issue 2: 72 - 78

DOI: https://doi.org/10.3969/j.issn.1006-6535.2026.02.008

油藏工程

页岩油藏CO₂前置压裂对裂缝网络的影响

崔传智 ,
钱银 ,
吴忠维 ,
王俊康 ,
张世明 ,
吕琦 ,
程紫燕

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1.中国石油大学(华东)石油工程学院,山东青岛 266580;
2.中国石油大学(华东)深层油气全国重点实验室,山东青岛 266580;
3.长江大学石油工程学院,湖北武汉 430100;
4.中国石化胜利油田分公司,山东东营 257015

崔传智(1970—),男,教授,博士生导师,1993年毕业于石油大学(华东)油藏工程专业,2005年毕业于中国地质大学(北京)矿产普查与勘探专业,获博士学位,现从事油气渗流理论、油气田开发技术方面的教学与研究工作。

收稿日期: 2025-02-20

修回日期: 2026-01-14

网络出版日期: 2026-07-30

基金资助

国家自然科学基金“致密油藏多段压裂水平井时空耦合流动模拟及参数优化方法”(51974343);中国石化科技部科研项目“东营凹陷页岩油立体开发优化设计关键技术”(P23026)

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Effect of CO₂ pre-fracturing on fracture networks in shale oil reservoirs

CUI Chuanzhi ,
QIAN Yin ,
WU Zhongwei ,
WANG Junkang ,
ZHANG Shiming ,
LYU Qi ,
CHENG Ziyan

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1. School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,China;
2. State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao,Shandong 266580,China;
3. School of Petroleum Engineering,Yangtze University,Wuhan,Hubei 430100,China;
4. Shengli Oilfield Company,Sinopec, Dongying,Shandong 257015,China

Received date: 2025-02-20

Revised date: 2026-01-14

Online published: 2026-07-30

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摘要

为研究页岩油藏CO₂前置压裂对裂缝网络规模与形态的影响,结合东营凹陷页岩油藏储层地质特征,应用Petrel软件建立了包含天然裂缝的三维地质模型,将裂缝网络体积和裂缝网络复杂度作为储层压裂改造效果评价指标,分析了不同天然裂缝密度、水平应力差下前置CO₂注入量对裂缝网络体积和复杂度的影响。研究表明:天然裂缝密度对裂缝网络体积影响较小,CO₂注入量增加使裂缝网络体积先减小后增大,当单段CO₂注入量超过约120 t时,其低黏度、高扩散性的优势才得以体现,裂缝网络体积快速增大。天然裂缝密度越高,裂缝网络复杂度也越高;对于天然裂缝发育的储层,CO₂注入量增加使裂缝网络复杂度先增大后趋于平缓。水平应力差对裂缝网络复杂度影响显著,低应力差条件下更容易形成分支缝。该研究可为页岩油储层水平井CO₂前置压裂设计提供理论指导。

关键词： CO₂前置压裂; 页岩油藏; 天然裂缝; 水平应力差; 裂缝网络体积; 裂缝网络复杂度

本文引用格式

崔传智 , 钱银 , 吴忠维 , 王俊康 , 张世明 , 吕琦 , 程紫燕 . 页岩油藏CO₂前置压裂对裂缝网络的影响[J]. 特种油气藏, 2026 , 33(2) : 72 -78 . DOI: 10.3969/j.issn.1006-6535.2026.02.008

Abstract

To investigate the influence of CO₂ pre-fracturing on the scale and morphology of fracture networks in shale oil reservoirs,a three-dimensional geological model that includes natural fractures was constructed using Petrel software,based on the reservoir characteristics of a shale oil formation in the Dongying Sag.By using the fracture network volume and network complexity as evaluation indices of fracturing effectiveness,analysis was made on the impact of CO₂ pre-injection volumes on these indices under different natural fracture densities and horizontal stress differences.The results showed that natural fracture density had little effect on fracture network volume;increasing CO₂ injection volume first reduced and then increased the network volume,with a sharp increase occurring once the CO₂ injected per stage exceeded about 120 t which point the low viscosity and high diffusivity of CO₂ dominated.Higher natural fracture density led to higher network complexity;in reservoirs with well-developed natural fractures,increasing CO₂ injection caused network complexity to rise and then level off.Horizontal stress difference significantly affected network complexity:branching fractures formed more readily under low stress-difference conditions.This study provides theoretical guidance for designing horizontal-well CO₂ pre-fracturing in shale oil reservoirs.

Key words： CO₂ pre-fracturing; shale oil reservoir; natural fracture; horizontal stress difference; fracture network volume; fracture network complexity

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