各向异性页岩储层脆性特征分析

发布时间：2018-03-12 09:10

本文选题：页岩　切入点：等效介质模型　出处：《物探与化探》2016年03期 　论文类型：期刊论文

【摘要】：针对页岩脆性各向异性特征的研究相对薄弱,亟待发展与之相应的页岩储层脆性研究。为实现页岩脆性指数的表征,基于多尺度建模思想,引入各向异性元依次建立纳米级多孔黏土颗粒、亚微米级富有机质黏土颗粒和微米级干岩石骨架,并综合考虑吸附气、束缚水等影响因素,改进了常规基于DEM理论及Gassmann理论的建模流程,建立了页岩储层等效介质模型并实现了弹性参数的表征。然后,引入方位角的影响,依据Bond变换推导得到了杨氏模量、泊松比等脆性指数各向异性表达式,实现了以等效介质模型弹性模量为参数的脆性参数表征。最后,总结了页岩储层脆性的各向异性特征以及页岩储层脆性对矿物组分的敏感性,发现平行于储层走向且垂直于层理方向上的脆性是垂直于储层走向且与层理45°夹角时的2.5倍;同时,脆性对石英的敏感强度约为黏土的2倍。该特征研究可以为储层脆性预测及水力压裂方案设定提供参考依据。
[Abstract]:Study on shale anisotropy is relatively weak, to develop the corresponding shale reservoir research. For the characterization of brittle shale brittleness index, multi-scale modeling based on anisotropic element in order to establish the nano porous clay particles, sub micron organic rich clay particles and micron dry rock skeleton. And considering the factors of adsorption gas, bound water, improved the conventional modeling procedure of DEM theory and Gassmann theory based on the established shale reservoir equivalent medium model and realize the characterization of elastic parameters. Then, the influence of azimuth Bond transform is derived, based on Young's modulus, Poisson's ratio, brittleness index anisotropy specific expressions, realized the fragility parameter characterized by the model of elastic modulus and equivalent medium parameter. Finally, summarizes the characteristics of anisotropic brittle shale and shale reservoirs The sensitivity of the brittleness of the layer mineral components of storage, parallel to the reservoir to find and perpendicular to the direction of the brittle bedding is perpendicular to the reservoir to 2.5 times and 45 degree angle of bedding; at the same time, the strength of brittle sensitive quartz is about 2 times of clay. This feature can be set to provide reference for the study for the reservoir prediction of brittle and hydraulic fracturing scheme.

【作者单位】：中国石油大学(华东)地球科学与技术学院;中国石化石油物探技术研究院;
【基金】：国家自然科学基金项目(41174100,41074087) 国家科技重大专项(2011ZX05014-004-003HZ) 中国石油天然气集团公司项目(2014A-3609)联合资助
【分类号】：P618.13;P631.4

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