【摘要】 本文从单程波方程出发,推导出角度域叠前时间偏移成像幅值计算方法.文章首先在时间域实现了速度梯度引起的幅值透射损失补偿算法;借鉴波动方程偏移的反褶积成像条件,对地震波能量随传播距离的几何扩散进行部分补偿;针对观测系统中炮点覆盖引起的角度域非均匀照明提出了相应的振幅补偿方法.三维水平层状理论模型成像结果表明获得的角道集具有较好的AVA特性.更多还原

【Abstract】 Based on the one-way wave equation,we develop the schemes to calculate amplitudes for pre-stack time migration in angle-domain.First,we develop a compensation scheme for amplitude loss induced by velocity gradient in time domain;Moreover,the geometric divergence of energy is partially compensated in angle domain by adopted de-convolution imaging condition of wave equation migration;Finally the amplitude compensation is applied for irregular illumination caused by diversity of shot coverage of acquisition system.The angular gathers of 3D layered model got by the above method shows good AVA(amplitude versus angle) characters.更多还原