基于应力-应变曲线形态的致密气储层脆性研究

发布时间：2018-06-27 04:29

  本文选题：致密气储层 + 应力-应变曲线　； 参考：《岩性油气藏》2017年03期

【摘要】：岩石的脆性研究对致密气的勘探开发具有重要意义。储层岩石脆性越高,压裂后裂缝越发育,产能越高。以鄂尔多斯盆地东北部二叠系致密气储层为研究对象,通过研究脆性岩石的单轴压裂起裂机制,以单轴压裂曲线的起裂点和峰值点的应力与应变为基础,结合多种脆性计算公式,建立了新的脆性指数计算模型。研究表明:利用新模型计算的脆性指数与基于静态岩石力学参数计算的脆性指数具有很明显的函数关系,可以有效表征研究区岩石的脆性;基于单轴抗压实验的压裂效果,利用新建立的脆性指数和初裂点指数可以有效地建立储层的压裂效果划分标准。该研究成果丰富了储层脆性计算的方法,建立了新的脆性评价标准。
[Abstract]:The study of rock brittleness is of great significance to the exploration and development of dense gas. The higher the brittleness of reservoir rock, the more developed fracture and productivity after fracturing. Taking Permian tight gas reservoir in northeastern Ordos Basin as the research object, the fracture initiation mechanism of brittle rock under uniaxial fracturing is studied, and the stress and strain of the starting point and peak point of uniaxial fracturing curve are taken as the basis. A new model for calculating brittleness exponent is established by combining various formulas of brittleness calculation. The results show that the brittleness exponent calculated by the new model has an obvious functional relationship with the brittleness index calculated on the basis of static rock mechanics parameters, which can effectively characterize the brittleness of rock in the study area, and the fracturing effect based on uniaxial compression test. Using the newly established brittleness index and initial fracture point index, the fracturing effect classification standard of reservoir can be established effectively. The research results enrich the method of reservoir brittleness calculation and establish a new criterion for brittleness evaluation.
【作者单位】： 长江大学地球物理与石油资源学院;长江大学油气资源与勘探技术教育部重点实验室;
【基金】：国家杰出青年科学基金项目“致密气储层岩石导电机理研究及饱和度评价”(编号:41404084) 湖北省自然科学青年基金项目“基于等效岩石单元模型的渗透率测井评价方法研究”(编号:2013CFB396)联合资助
【分类号】：TE311
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本文编号：2072671