摘要
波动方程正演模拟法相对于射线法具有精度高、效率低的特点。为了提高其效率 ,提出了一种高阶差分正演模拟方法。该方法考虑了速度场局部的强横向变化 ,适于复杂介质的正演模拟 ;在相同精度下 ,高阶差分的空间横向间隔可取为低阶差分的 2~ 4倍 ,有较高的计算效率 ;高阶差分加上合适的边界条件能较好地解决网格频散和边界效应问题。通过对Marmousi模型的试算 ,验证了该方法对复杂速度模型的适应性、有效性和实用性。
The forward modelling method of wave equation is of a high precision and a lower computing efficiency compared with the ray theory based method. A high order finite difference forward modelling method was proposed to improve its efficiency.The local strong lateral velocity variation was taken into consideration in this method, so it fits for the forward modelling in complicated media. For the same precision of simulation, the high order finite difference method has a higher computing efficiency, as its depth interval can be selected by 2 4 times of the depth interval of the low order difference method. When a suitable boundary condition is given, this method can solve the problems of the numerical dispersion and boundary effectiveness. The application to Marmousi model shows that the adaptability, effectiveness and utilities of the method to the complex velocity model are qualified.
出处
《石油大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2002年第5期37-39,共3页
Journal of the University of Petroleum,China(Edition of Natural Science)
基金
国家自然科学基金会与大庆石油管理局联合资助项目 (4 9894190 2 4)
关键词
波动方程
高阶差分
正演模拟方法
横向变速
吸收边界
地震勘探
wave equation
high order finite difference
forward modelling
lateral velocity variation
absorbing boundary