页岩油藏脉动水力压裂缝网实时扩展AE演化机制分数阶方法研究

探讨页岩油储层体积压裂缝网形成与连通性一直是学者们追求解决的热点问题，深入剖析挖掘问题的切入点是课题研究的前提，选择精准的理论方法与研究手段是解决问题的关键。本课题以页岩层理对水力裂缝纵向扩展的抑制问题着手，提出研究脉动水力压裂造缝分数阶变分原理能量耗散机制，揭示缝网形成的学术思想，依据声发射信号动态演化特征研究裂缝实时扩展行为研究思路。课题以岩石力学界面为基础，依据声发射信号特征建立脉动水力压裂裂缝启裂与多模式实时扩展评价方法，提出基于分数阶理论研究裂缝实时扩展的非线性动力学能量耗散与声发射波传播规律。依据裂缝实时扩展的声发射震源机制揭示裂缝多模式实时扩展路径识别与三维缝网规模的定量表征方法。课题为脉动水力压裂实现页岩油储层的缝网压裂改造机制与体积缝网规模评价开辟了新的思路。对页岩油压裂储层改造及高效开发具有科学指导意义和学术价值，课题研究具有前瞻性，国内外少见报道，研究成果有突破性。

Discussion on formation mechanism and connectivity of shale oil reservoir volume fracturing network has been the core and hot issue that scholars have been pursuing to solve. An in-depth analysis of the entry point of the mining problem is the premise of the research, and the selection of precise theoretical methods and research methods is the key to solve the problem. This topic starts from the problem of shale bedding inhibiting the longitudinal expansion of hydraulic fractures. The academic idea of studying the nonlinear dynamic dissipation mechanism of pulse hydraulic fracturing to reveal the formation of fracture network is proposed. Based on the dynamic evolution characteristics of acoustic emission signals, research ideas on real-time crack propagation behavior are studied. This project is based on the rock mechanics layer interface, and based on the characteristics of acoustic emission signals, the evaluation method of crack initiation and multi-mode real-time expansion for pulse hydraulic fracturing is established. The nonlinear dynamic energy dissipation and acoustic emission wave propagation law of crack real-time propagation based on fractional order theory are proposed. According to the acoustic emission focal mechanism of real-time fracture propagation, the multi-mode real-time fracture propagation path identification and quantitative characterization method of three-dimensional fracture network scale are revealed. The topic has opened up new research ideas and methods for the research on fracture network fracturing reformation mechanism and volume fracture network scale evaluation of shale oil reservoir by pulse hydraulic fracturing, and has scientific guiding significance and academic value for shale oil fracturing reservoir reconstruction and efficient development. This research of the topic is forward-looking and has been rarely reported at home and abroad, the research results are breakthrough.