三维井间地震高斯射线束正演  

3D cross-well seismic Gaussian beam forward modeling

作　　者：杨飞龙 张林 孙渊[2] 谷开拓 张瑾爱 

机构地区：[1]陕西省地质调查中心,西安710068 [2]长安大学地测学院,西安710054

出　　处：《地球物理学进展》2016年第5期2027-2035,共9页Progress in Geophysics

基　　金：十二五国家科技重大专项子课题"海上斜井井间地震资料成像处理技术及应用研究"(2011ZX05024-001-03)资助

摘　　要：使用高斯射线束方法对三维井间地质模型进行波场正演,解决三维井间地震复杂构造波场识别问题.正演模拟时将每一个检波点与炮点拟合出一个接收平面,使得每一个检波点处的能量都由其接收平面上检波点的有效半宽度范围内所有射线能量高斯加权.高斯束正演具有地震波动力学特征且能够有效解决复杂构造盲区问题,同时保持波场的相对振幅特征,因而适用于不同地质构造模型.比较三维井间地震逐段迭代正演方法,高斯束正演克服了复杂地质模型的盲区与动力学特征问题;并且高斯束正演时反射点的分布范围广,大大提高了反射波成像精度.应用三维井间地震高斯束正演方法对X地区进行波场正演,结果表明该方法可以有效分辨波场特征,为进一步地震数据处理提供准确依据.The Gaussian beam method is used in wave field forward of three dimension cross-well geological model, It solves the problems of wave field identification in 3D cross-well complex structure. A receiving plane is formed by each geophone and shot point in forward modeling, the energy of every geophone is Ganssian weighted stacked by the rays in the half width of the range of geophone on the receiving plane. Gaussian beam forward has the characteristics of seismic wave dynamics and effectively solve the problem of blind area in complex structures, It also maintains the relative amplitude characteristic of wave field and is suitable for different geological structure model. Compared with 3D cross-well seismic piecewise iteration forward modeling method, Gaussian beam forward overcomes the problems of blind area and dynamics characteristics in complex geological model, and the distribution range of reflection point is wider than piecewise iteration forward modeling method, It greatly improves the precision of reflection wave imaging. 3D cross-well seismic Ganssian beam forward modeling method is used in X area＇ s wave field forward, the results show that this method can effectively distinguish the characteristics of seismic wave fields, and provides accurate basis for seismic data processing and interpretation.

关 键 词：三维井间地震 高斯束正演 动力学特征 逐段迭代正演 成像 

分 类 号：P631[天文地球—地质矿产勘探]