方解石脉影响岩石力学性能的数值模拟分析  

Numerical Simulation Analysis of the Influence of Calcite Veins on Rock Mechanical Properties

作　　者：程晓雪 CHENG Xiao-xue(China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《河北地质大学学报》2024年第4期71-79,共9页Journal of Hebei Geo University

摘　　要：论文通过三轴实验得到峰值应力和杨氏模量随方解石充填缝倾角的变化关系,并基于数字图像处理技术需考虑的岩石材料参数非均质性、基元划分精度等条件,采用岩石真实破裂分析系统RFPA2D进行数值模拟分析,构建了含方解石脉填充的砂岩模型,探究了方解石脉不同生长角度、宽度和岩样非均质度对岩体破裂模式的影响。研究结果表明:方解石脉生长角度越趋于施加载荷方向、宽度越大、非均质度越高,岩石稳定性越低,破裂更快更彻底;由于库车坳陷克拉苏构造带的巴什基奇克组储层密度大、埋深差异大、非均质性强,在构造应力作用下生成的裂隙为其提供了良好的油气储运条件,数值模拟得出破裂模式合理解释了该区油气藏资源丰富的原因。This paper obtained the relationship between peak stress and Young's modulus with the inclination angle of calcite-filled joints through triaxial experiments,and based on digital images.The processing technology needs to consider conditions such as the heterogeneity of rock material parameters and the accuracy of primitive division.The real rock fracture analysis system RFPA2D was used for numerical simulation analysis.A sandstone model filled with calcite veins was constructed to explore the different growth angles of calcite veins and effects of width and rock sample heterogeneity on rock mass fracture patterns.The research results show that:the more the growth angle of calcite veins is closer to the direction of applied load,the larger the width,and the higher the heterogeneity,the lower the stability of the rock and the faster and more complete rupture;due to the Bashi in the Kelasu Tectonic Belt of the Kuqa Depression The Jiqike Formation reservoir has high density,large differences in burial depth,and strong heterogeneity.The fractures generated under the action of tectonic stress provide it with good oil and gas storage and transportation conditions.The fracture model obtained by numerical simulation reasonably explains the area of rich resources of oil and gas reservoirs.

关 键 词：方解石脉 破裂模式 岩石力学性质 数值模拟 

分 类 号：P554[天文地球—构造地质学]