摘要
超声波数据是研究碳酸盐岩储层孔隙结构的重要资料,超声波响应可用来反演孔隙结构.本文从声波波动理论出发,以裂缝模型为研究对象,开展超声波数值模拟研究.结果表明:随着裂缝孔隙度的增加,岩石声波衰减系数总体呈上升趋势,但孔隙度增长方式不同,衰减系数的递增函数规律亦不同;随着裂缝延伸方向与声波激发方向的夹角增大,岩石声波的衰减系数线性增加;衰减系数随着裂缝密度增大呈幂函数规律递增;利用数值模拟的方法能避免人为误差、节约实验成本,为裂缝结构的岩石声波实验研究拓展了思路.
Ultrasonic data is the important information to study the carbonate reservoir pore structure; the acoustic response can be used in the inversion of pore structure. This paper was based on the acoustic wave theory and the fracture model to carry out numerical simulation of ultrasonic wave. The results showed that with the increase of fracture porosity, rock acoustic attenuation coefficient exhibited an overall upward trend. However, for different ways of porosity growth, the increasing function of attenuation coefficient is also different; when the angle between the directions of crack extension and acoustic excitation increases, the attenuation coefficient increases linearly. Attenuation coefficient increases as a power function as the crack density increases. The numerical simulation method can avoid human errors and save the cost of experiments. At the same time, it can expand ideas for studying cracks and fracture-cave structure of the rock with acoustic experiments.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第6期2044-2052,共9页
Chinese Journal of Geophysics
基金
中石油创新基金(2009D-5006-03-02)资助
关键词
孔隙结构
波动理论
裂缝模型
数值模拟
衰减系数
Pore structure, Wave theory, Fractured model, Numerical simulation, Attenuation coefficient
