论文详情
局部相关反射波同相轴的斜率反映了射线参数、慢度水平分量等地震波运动学信息,被用于地下速度建模和偏移成像等地震数据处理中。拾取反射波同相轴斜率是应用斜率数据的必然环节。提出了一种基于曲波变换(Curvelet transform)的地震反射波同相轴斜率拾取方法。该方法根据曲波变换所具有的各向异性和局部方向性的性质,利用地震信号曲波变换后的曲波系数,确定地震反射同相轴位置和延伸方向,再将延伸方向换算成斜率值。理论数据测试和实际地震资料试应用结果表明,与常用的基于倾斜叠加以及直线—双曲线叠加的反射波同相轴斜率拾取方法相比,该方法具有更高的精度。
The slopes of locally coherent reflection events represent ray parameters or slowness horizontal components and other kinematic information,which are used in seismic data processing,such as velocity model building,migration imaging,and etc.Picking slopes of reflection events is an essential step in seismic data processing.An automatic picking method is proposed for slopes of reflection events based on Curvelet transform.Based on the characteristics of local directionality and anisotropy for Curvelet transform,the method use the Curvelet coefficients from seismic data transformed by fast discrete Curvelet transform to obtain the location and direction of locally coherent reflection events.And the slopes are finally estimated from the above directions.The tests with both synthetic and field data show that this method has a higher precision compared with either the existing slant stack method or linear-hyperbolic stack method.
国家自然科学基金项目(41074077、41230318)资助。