CAJ | 학술논문

直接从起伏地表开始进行叠前深度偏移的波场初始化时,应用了同步边界处理策略和深度误差校正策略.前者可以消除起伏地表非波场传播区域的成像,后者可以消除起伏地表规则采样时深度误差对地下构造成像带来的影响.利用以上处理策略,优化了常规基于单程波波动方程延拓算子的起伏地表叠前深度偏移算法,从而更好实现了复杂条件下的构造成像.基于FFD延拓算子的波场下延法,用SEG起伏地表模型数据验证了该方法的有效性.该方法同样适用于各种基于频率域波动方程深度延拓算子的起伏地表深度偏移方法.
직접종기복지표개시진행첩전심도편이적파장초시화시,응용료동보변계처리책략화심도오차교정책략.전자가이소제기복지표비파장전파구역적성상,후자가이소제기복지표규칙채양시심도오차대지하구조성상대래적영향.이용이상처리책략,우화료상규기우단정파파동방정연탁산자적기복지표첩전심도편이산법,종이경호실현료복잡조건하적구조성상.기우FFD연탁산자적파장하연법,용SEG기복지표모형수거험증료해방법적유효성.해방법동양괄용우각충기우빈솔역파동방정심도연탁산자적기복지표심도편이방법.
We propose the synchronal boundary process theme and depth error correction theme while wave-field initialization for pre-stack depth migration from irregular surface directly. The former is used to eliminate the im-age in non-wave field area and the latter is used to clear up the affection to the image of subsurface structures caused by the depth error while sampling the surface. These two themes optimize the regular one-way wave-equation based pre-stack depth migration methods from irregular surface, and make better results for the structure imaging under complex conditions. We present these two themes using FFD operator on the SEG irregular surface model dataset. The results demonstrate the improvement of the precision of the pre-stack depth migration from irregular surface. The presented method is also effective for any wave equation depth migration method from irregular surface based on depth propagator in frequency domain.