页岩油储层层理与天然裂缝对压裂裂缝扩展影响数值模拟研究

刘建峰; 齐宁; 郭楠; 苏建; 蒋平; 陈铭; 李爱华

doi:10.3969/j.issn.1006-6535.2026.03.010

特种油气藏 >

2026 , Vol. 33 >Issue 3: 89 - 97

DOI: https://doi.org/10.3969/j.issn.1006-6535.2026.03.010

钻采工程

页岩油储层层理与天然裂缝对压裂裂缝扩展影响数值模拟研究

刘建峰 ,
齐宁 ,
郭楠 ,
苏建 ,
蒋平 ,
陈铭 ,
李爱华

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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.中国石油辽河油田分公司,辽宁盘锦 124010;
3.中国石油大学(华东)深层油气全国重点实验室,山东青岛 266580

刘建峰(1982—),男,教授级高级工程师,《特种油气藏》编委会副主任,2004年毕业于石油大学(华东)油气储运工程专业,现为中国石油大学(华东)石油与天然气工程专业在读博士研究生,主要从事石油天然气勘探开发综合研究及油气与新能源业务管理工作。

收稿日期: 2025-10-15

修回日期: 2025-10-15

网络出版日期: 2026-09-04

基金资助

山东省自然科学基金“深层碳酸盐岩酸压酸蚀裂缝导流能力演化规律研究”(ZR2024ME106);山东省自然科学基金“基于蚓孔竞争机制的缝洞型油藏储层尺度精准酸化模拟研究”(ZR2025MS853)

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Numerical simulation study on the effects of laminae and natural fractures on hydraulic fracture propagation in shale oil reservoirs

LIU Jianfeng ,
QI Ning ,
GUO Nan ,
SU Jian ,
JIANG Ping ,
CHEN Ming ,
LI Aihua

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1. School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,China;
2. PetroChina Liaohe Oilfield Company,Panjin,Liaoning 124010,China;
3. State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao,Shandong 266580,China

Received date: 2025-10-15

Revised date: 2025-10-15

Online published: 2026-09-04

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摘要

辽河雷家地区沙四段发育一套滨浅湖相混积型页岩油,岩石类型多样,层理与天然裂缝发育,压裂裂缝形态复杂多变。为揭示层理与天然裂缝对页岩油压裂裂缝扩展行为的影响,基于雷家地区页岩油典型地质与力学参数,综合利用连续-非连续单元法(CDEM)与有限体积法(FVM),建立了耦合块体变形-裂缝破裂-裂缝流动的数值模拟模型,构建了层理型、天然裂缝型与夹层型3类代表性地质模型,在固定注入液量条件下,研究注入排量与压裂液黏度对3种地质模型压裂裂缝扩展的影响。研究表明:注入排量的增加可显著提高主裂缝的最大开度,同时黏度升高也有助于裂缝开度的增大。在天然裂缝体系中,中低排量或低黏度条件更易促使裂缝沿天然裂缝扩展,高排量与高黏度条件下主裂缝更倾向于穿越天然裂缝并改变分支连通模式;在夹层体系中,提高排量与黏度有助于减小层间裂缝开度差异并提升主缝平均开度。研究成果可为同类型页岩油储层压裂裂缝形态设计与泵注参数优化提供技术支持。

关键词： 页岩; 水力压裂; 裂缝扩展; 连续-非连续单元法; 有限体积法; 雷家地区

本文引用格式

刘建峰 , 齐宁 , 郭楠 , 苏建 , 蒋平 , 陈铭 , 李爱华 . 页岩油储层层理与天然裂缝对压裂裂缝扩展影响数值模拟研究[J]. 特种油气藏, 2026 , 33(3) : 89 -97 . DOI: 10.3969/j.issn.1006-6535.2026.03.010

Abstract

A set of mixed shale oil reservoirs deposited in a littoral-shallow lacustrine environment is developed in the fourth member of the Shahejie Formation in the Leijia Area of the Liaohe region.The rocks are lithologically diverse with well-developed laminae and natural fractures,leading to complex and variable hydraulic fracture geometries.To reveal the effects of laminae and natural fractures on hydraulic fracture propagation in shale oil reservoirs,based on typical geological and mechanical parameters of shale oil in the Leijia Area,this study combined the continuous-discontinuous element method(CDEM) and the finite volume method(FVM) to establish a numerical simulation model coupling block deformation,fracture failure and fracture flow.Three representative geological models,namely,laminae-dominated,natural-fracture-dominated and interlayer-dominated,were constructed.Under a fixed injected-fluid volume,the effects of injection rate and fracturing-fluid viscosity on hydraulic fracture propagation in these three geological models were investigated.The results show that increasing injection rate can significantly enhance the maximum aperture of the main fracture,and increasing viscosity also helps enlarge fracture aperture.In natural-fracture systems,medium-to-low injection rates or low-viscosity conditions more readily promote fracture propagation along natural fractures,whereas under high injection rates and high viscosity the main fracture is more likely to cross natural fractures and alter branch connectivity patterns.In interlayer systems,increasing injection rate and viscosity helps reduce differences in fracture aperture between layers and improve the average aperture of the main fracture.The results can provide technical support for hydraulic fracture geometry design and pumping-parameter optimization in similar shale oil reservoirs.

Key words： shale; hydraulic fracturing; fracture propagation; continuous-discontinuous element method; finite volume method; Leijia Area

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