Mechanical characteristics and reservoir stimulation mechanisms of the Gulong shale oil reservoirs,the northern Songliao Basin

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外文摘要：Shale oil of the Qingshankou Formation of the Gulong Sag,the northern Songliao Basin,represents the first attempt at large-scale development of pure-shale-type shale oil in China.By integrating the multi-scale refined reservoir characterization with macro-micro-scale mechanical testing,it is clarified that the Gulong shale is characterized by high clay mineral content,high rock plasticity,highly-developed bedding,and prominent mechanical anisotropy.A three-dimensional(3D)fracture propagation model of hydraulic fracturing was built for the Gulong shale,which fully captures the hydraulic fracture dis-tribution pattern affected by the high bedding density,in-situ stress,and fracturing treatment param-eters.Our research showed that due to influences of bedding,hydraulic fracturing in the Gulong shale forms a complex fracture morphology featuring the main fracture with multiple perpendicular branches that have different lengths(like the outdoor directional TV antenna);however,the vertical propagation of fractures is inhibited,and the fracture height is commonly less than 10 m.The limited stimulated reservoir volume(SRV)is the main problem facing the fracturing stimulation of the Gulong shale oil.Bedding density has vital effects on fracture morphology,so case-specific fracturing designs shall be developed for shale intervals with different bedding development degrees.For reservoirs with well-developed bedding,it is suggested to properly increase the perforation cluster spacing and raise the volume and proportions of viscous fluids of the pad,so as to effectively promote vertical fracture propagation and improve reservoir stimulation performance.This study integrates multi-scale fine reservoir characterization and macro-micro-scale mechanical testing,as well as the construction and numerical simulation of hydraulic fracturing models for high-density layered shale reservoirs,providing a new approach and methodological framework for the fracturing research of high-density layered shale reservoirs.

外文关键词：

Shale oilHydraulic fracturingHigh bedding densityFracture propagation model

作者：

Si-Wei Meng、Jia-Ping Tao、Tian-Jiao Li、Dong-Xu Li、Su-Ling Wang、Liu Yang、Xin Liu、Li-Hao Liang、He Liu

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作者单位：

PetroChina Research Institute of Petroleum Exploration Development,Beijing,100083,China

National Key Laboratory of Continental Shale Oil,Daqing 163002,Heilongjiang,China

Dalian University of Technology,Dalian 116024,Liaoning China

PetroChina Daqing Oilfield Co.Ltd.,Daqing,163002,Heilongjiang,China

Northeast Petroleum University,Daqing,163002,Heilongjiang,China

China University of Mining and Technology（Beijing）,Beijing 100083,China

Dalian University of Technology,Dalian,116024,Liaoning,China

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基金：

General Program of National Natural Science Foundation of Chinathe"Enlisting and Leading"Science and Technology Project of Heilongjiang Provincethe"Enlisting and Leading"Science and Technology Project of Heilongjiang ProvinceCentral Program of Basic Science of the National Natural Science Foundation of China

项目编号：

52274058RIPED-2022-JS-1740RIPED-2022-JS-185372088101

出版年：

2024

DOI：

10.1016/j.petsci.2023.11.002

石油科学(英文版)

中国石油大学（北京）

石油科学(英文版)

影响因子：0.88

ISSN：1672-5107

年,卷(期)：2024.21(3)