摘要
利用纵波检测地层中的裂隙是油气勘探、工程探测等领域中的主要方法,也是地球物理领域中的难点.在各向同性介质的背景上,因存在裂隙而形成的散射作用,使接收的波场复杂化.为了正确认识裂隙介质中地震波场特征,以声波方程为基础,为了提高计算精度,应用高阶(十阶)有限差分法求解数值解,给定裂隙介质地质模型和均匀层状介质地质模型,通过数值模拟得到地质模型的地面地震响应.在此基础上,进行分析对比,总结了裂隙介质中地震波场特征,在裂隙发育带顶、底,纵波地面地震记录波形特征均有明显的变化,这表明利用纵波动力学特征作裂隙检测是可行的.
Determining the stratum fracture as an essential approach to the field of prospecting oilgas and engineering detecting based on P\|wave is very difficult. Seismic wave field is complicated in the isotropy medium where there are some fracture because of the scattering.To recognize seismic wave character in the fracture stratum, this paper deals with the simulating seismic record of the fracture medium and uniformity stratum based on sound wave equation and by using high order finite difference method for improving precision. Meanwhile, it analyzes the change of the characters of seismic wave field in the strap of fracture growth. Results indicate that it is feasible to detect the fracture by dynamics characters of P\|wave.
出处
《计算物理》
CSCD
北大核心
2004年第1期91-94,共4页
Chinese Journal of Computational Physics
基金
国家自然科学基金(40174039)
973项目(G1999043311)资助项目
