论文详情
基于模型的观测系统照明分析技术在复杂地区的观测系统设计中起着非常重要的作用,但随着野外勘探复杂程度的增加,三维地质模型也更加复杂,常用的射线方法在精度上已经不能很好地满足实际生产的需求,波动方程类方法则由于计算效率较低在实际使用中存在很大局限性。提出了一种基于高斯射线束的双向照明方法,给出了方法的实现步骤。该方法将波场分解到具有一定宽度的射线束上实现波场的模拟和延拓,通过检波点射线坐标反向变换,根据互易性原理实现观测系统的双向照明,不仅大幅提高了计算效率，而且有效改善了照明的精度。根据高斯射线束照明结果分析和统计炮点对各目的层面元的双向照明贡献,优选对低能量目的层区域贡献大的炮点附近进行补炮,从而实现观测系统的局部优化。采用一个三维地质模型验证了高斯射线束双向照明算法的合理性和正确性。
The seismic geometry illumination technology based on geological model plays an important role on seismic exploration in complex area.However,since the field exploration becomes more and more complicated,3-D geologic model becomes more complex and the conventional ray method isn’t able to meet the need of actual production.On the other hand,the wave equation method has many limitations in practical application because of low efficiency.Using Gaussian beams to carry out wavefield forward simulation and continuation,Gaussian beam bi-directional illumination method not only keeps the high-efficiency and flexibility but also overcomes some shortcomings of conventional ray method,effectively solves the problem of rapid illumination on complex 3-D geologic model.According to Gaussian beam illumination result we can choose the best seismic geometry,and realize local optimization based on analysis and statistics of the result.
国家科技重大专项“煤层气地震采集和处理技术”项目(2011ZX05035-002)资助。