三维并行合成震源记录叠前深度偏移

提出了一种基于波动理论的三维合成震源记录叠前深度偏移方法，该方法不含任何物理假设，利用波动方程算子的3个性质，合成炮震源及炮震源记录，将面炮记录合成与相位编码合成两种方法在理论上和计算上合二为一，成为一个统一的合成理论. 通过双重叠加把三维叠前五维数据转换为三维数据，既保证了成像质量同炮记录偏移成像一样精确，又显著地提高了计算效率，且适于复杂地质构造成像. 针对不同情况，给出了几种不同的合成算子，使方法在实际应用中有较大的灵活性和选择性. 基于MPI并行算法的实现，进一步提高了计算效率. SEG＼EAGE盐丘C3_NA数据模型上的试算结果和新疆三维起伏地表实际地震资料的处理结果进一步说明了该方法的有效性和实用性.

3_D parallel prestack depth migration of synthetic source records

An improved wave equation 3-D prestack depth migration method is presented in this paper. The shot sources and source records can be synthesized by using three properties of the wave equation operator without any physical assumption. In terms of three synthetic formulae we unify the area shot record synthetic method and phase encoding synthetic method under one theoretical framework. The 5-D data sets of 3-D prestack are converted into 3-D data sets by double synthesizing in the migration method, which retain accuracy of shot profile migration and overcome drawback of high computational costs. The method is flexible and selectable by designing different synthetic operators for different input data sets. The realization of parallel programming with MPI speeds up computation. The tests of the 3-D SEG/EAGE salt C3-NA data set and the seismic data on rugged ground in Xinjiang set show that the method is efficient and practical.