基于声发射岩体压裂损伤演化特征研究

非常规油气储层体积压裂是油气开采的主要技术手段,准确地描述缝网压裂裂缝的演化规律是研究体积压裂的核心问题,运用声发射信号参数特征定义了岩体损伤变量,基于能量守恒原理,建立压裂岩体破裂与裂缝演化的折迭突变模型.通过选取吉林德惠菜园子页岩岩心开展了相关研究,理论计算与室内试验结果表明,岩体压裂具有突变破裂行为特征,理论计算结果与室内试验结果吻合较好.为后续裂缝演化研究奠定了科学基础.

Study and Application on Fractal Damage Mutation Evolution Model of Coal and Rock Mass Fracturing

Volume fracturing of unconventional oil and gas reservoir is the major technical means in oil and gas production.Describing the evolution laws of fracturing cracks networks accurately is the core problem in volume fracturing research.In this paper,characterization parameters of AE signal were used to define damage variables of rock mass,and based on energy conservation theory,fold catastrophe model of rock mass fracturing and cracks evolution was established.By selecting the Dehui garden shale cores of Jilin to do some related studies,theoretical and laboratory tests results show that the rock mass fracturing have mutation rupture characteristics.The calculated results are in good agreement with the experimental results,which laying the scientific basis for following-up studies on evolution of cracks.