一种改进的地震反射层析成像方法

A improved seismic reflection tomographic method

针对复杂介质的地震反射走时层析成像存在数据拾取困难问题,本文提出了一种新的地震反射层析成像速度模型建立方法,该方法用速度和地震射线走时描述模型,用地震反射波走时、地震波在源点和接收点处的传播方向信息反演模型.为提高反演的稳定性和计算效率,引入了Hamilton函数描述射线,在相空间计算反演所需的射线路径和目标函数对模型参数的导数,对理论模型和实际地震资料进行了试算,试算表明该方法对复杂介质具有较强的适应能力.

Data picking a new seismic reflection is difficult for seismic reflection travehime tomography in complex media. In this study tomographic method is complex media, in which the model is described fitting seismic ray traveltimes and positions to d stability and efficiency, seismic ray is described proposed for estimating velocity model from seismic data in by velocity field and a set of ray traveltimes. It consists of ata calculated by ray tracing. In order to improve inversion by Hamilton function and ray tracing is done in phase space. Validation tests on synthetic and practical data are analyzed. The tests show that this tomographic method is effective for estimating velocity field in complex media.