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叠前逆时偏移方法可以精确成像复杂地下构造,利用高阶有限差分方法求解声波方程,并给出了满足稳定性条件的采样间隔的选取方式.利用GPU/CPU加速技术实现地震资料的叠前逆时偏移算法,极大地提高了计算效率,算法也采用随机边界条件,节约了大量存储空间.分析了速度模型变化对成像结果的影响.复杂地震数据成像的测试结果表明,所述的叠前逆时偏移算法可清晰成像陡倾角成像清晰,对盐丘边界和内部构造成像效果也较好.
The prestack inverse time migration method can accurately image the complex subsurface structure, and use the high order finite difference method to solve the acoustic wave equation, and gives the selection method of the sampling interval to meet the stability condition.Using GPU / CPU acceleration technology to realize the stacking of seismic data The pre-inverse time migration algorithm greatly improves the computational efficiency, and the algorithm also adopts stochastic boundary conditions to save a large amount of storage space. The impact of the velocity model changes on the imaging results is analyzed. The test results of the complex seismic data imaging show that, The prestack inverse time migration algorithm can clearly image the steeply incisive image and clear the image of the salt dome boundary and internal structure.