地震波场射线类正演模拟方法对比

发布时间：2018-03-07 13:07

本文选题：射线正演　切入点：高斯束正演　出处：《地球物理学进展》2017年02期 　论文类型：期刊论文

【摘要】：射线类正演方法以其高效,灵活的特点,在复杂地区的勘探中发挥着非常重要的作用.常规射线正演方法只考虑地震波的运动学特征,精度较低,且对复杂构造适应性较差;高斯射线束正演方法作为常规射线正演方法的一种改进,同时考虑地震波的运动学和动力学特征,且无需两点射线追踪,兼具计算效率和精度;菲涅尔束正演模拟进一步从波动理论角度对高斯射线束的有效半宽度进行了限制,改进了波场模拟的精度和稳定性.对三种射线类正演模拟方法进行理论解剖和分析,在高斯射线束正演方法的基础上,用第一菲涅尔带半径约束高斯束束宽实现了菲涅尔束正演算法.基于理论模型和实际模型,对三种射线类正演方法和波动方程有限差分法进行对比分析,结果表明高斯射线束正演方法具有较高的计算精度;菲涅尔束正演方法更加稳定,精度更高,更接近于波动方程有限差分方法.高斯射线束和菲涅尔束均具有较高的计算效率,适合于对波场模拟精度不高但对运算效率有较高要求的应用环境.
[Abstract]:Because of its high efficiency and flexibility, ray forward modeling plays an important role in the exploration of complex areas. The conventional ray forward modeling only considers the kinematics characteristics of seismic waves, and its accuracy is low, and its adaptability to complex structures is poor. As an improvement of the conventional ray forward modeling method, Gao Si's ray beam forward modeling method takes into account the kinematic and dynamic characteristics of seismic waves, and does not require two-point ray tracing, and has both computational efficiency and accuracy. Fresnel beam forward modeling further limits the effective half width of Gao Si ray beam from the angle of wave theory and improves the accuracy and stability of wave field simulation. On the basis of Gao Si ray beam forward modeling method, the Fresnel beam forward algorithm is realized by using the first Fresnel band radius constraint Gao Si beam width. Three kinds of ray forward modeling methods and wave equation finite difference method are compared and analyzed. The results show that Gao Si ray beam forward modeling method has higher calculation accuracy, Fresnel beam forward modeling method is more stable and accurate, Gao Si ray beam and Fresnel beam have high computational efficiency and are suitable for the application environment where the accuracy of wave field simulation is not high but the computational efficiency is high.
【作者单位】：中石化石油工程地球物理有限公司胜利分公司;中国石油大学(华东)地球科学与技术学院;
【分类号】：P631.4

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