我们通过使用许多偏移和速度分析技术,用迭代生成了艾伯塔山前测线的深度图像。很明显,在对山前数据集的陡倾层进行成像时,逆冲断层带的地质构造不符合高程基准面校正和共中心点叠加的常规假设。为了避免这些问题,我们使用了地形偏移。在这种偏移中,用具有正确的激发和接收高程的数据进行叠前深度偏移。与常规处理相比,地形偏移能生成陡倾浅反射层的增强图像。除了地形偏移外,我们还将叠前深度偏移同不断地修改速度深度模型相结合。在这个过程中使用了许多准则,这些准则要求我们的速度计算能产生一个聚焦图像,而且共图像道集的偏移深度与炮检距无关。通过一系列涉及叠前偏移速度分析和构造解释的迭代和解释步骤计算出速度模型。深度偏移与速度模型的叠加一般能显示出速度边界和反射层之间的一致性。利用叠前逆时深度偏移再加上仔细的地质解释能产生效果很好的地震深度刮面。 We iteratively generated depth images of the Alberta Piedmont Line using many offset and velocity analysis techniques. Obviously, the geological structure of the thrust belt does not conform to the conventional assumption of elevation datum correction and co-center stacking when imaging steep layers of a Piedmont dataset. To avoid these problems, we used the terrain offset. In this offset, prestack depth migration is performed with data that has the correct excitation and reception elevation. In contrast to conventional processing, topographic offsets generate enhanced images of steep, shallowly reflective layers. In addition to the topography offsets, we also combine the prestack depth migration with an ever-changing velocity depth model. Many criteria are used in this process, which require that our velocity calculations produce a focused image, and that the offset depth of the common image gathers is independent of offset. The velocity model is calculated through a series of iterative and explanatory steps involving prestack migration velocity analysis and tectonic interpretation. The superposition of the depth offset and the velocity model generally shows the consistency between the velocity boundary and the reflector. The use of prestack inverse depth migration coupled with careful geologic interpretation can produce well-performing seismic depth shaving.