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随着地震勘探的不断深入以及叠前偏移技术的快速发展,叠前时间偏移技术得到了广泛的应用并且在多个区块取得了良好的应用效果。而Kirchhoff积分法是目前在实际地震资料处理中应用最为广泛的一种叠前时间偏移方法。走时计算是Kirchhoff积分法叠前时间偏移中最重要的环节,然而传统的走时计算方法无法解决地下构造复杂的情况,因此,文中引入了基于层速度模型的弯曲射线走时计算方法,通过地下构造复杂的盐丘模型以及一块实际资料的处理结果对比,表明了基于弯曲射线走时计算方法的Kirchhoff叠前时间偏移方法和传统的Kirchhoff叠前时间偏移方法相比,不仅具有计算效率高、适应能力强的优点,而且在地下构造复杂的情况下使成像效果得到了较为明显的改善。
With the deepening of seismic exploration and the rapid development of prestack migration technology, the prestack time migration technology has been widely used and has achieved good results in many blocks. The Kirchhoff integral method is the most widely used prestack time migration method in the actual seismic data processing. Time-lapse calculation is the most important part of prestack time migration in Kirchhoff’s integral method. However, the traditional method of travel time calculation can not solve the complex underground conditions. Therefore, the calculation method of travel time of curved ray based on layer velocity model is introduced in this paper. Comparing the complicated salt dome model with the actual data, it shows that the Kirchhoff prestack time migration method based on curved ray traveltime method is more efficient than the traditional Kirchhoff prestack time migration method, which not only has the advantages of high computational efficiency, The advantages of strong, but also in the case of complex underground structure so that the imaging results have been significantly improved.