双重网格井间地震层析成像技术

提出了一种不同于常规的井间地震层析成像技术，即在较细的网格上进行射线追踪，以提高射线路径和旅行时的计算精度，在较粗的网格上进行层析反演成像，使网格像素上射线覆盖的最低次数达到一定要求，以提高成像质量。分析了采用这种双重网格地震层析成像技术的必要性，模型实验证实了此技术实用性和有效性。

Cross-Hole Seismic Tomography with Double Grid

This paper presents a kind of cross-hole seismic tomography technique different from the traditional ones. That method traces the ray path and calculate the first arrival between each source and every receiver on the fine grid to improve the computing precision, and then, applies the inversion algorithms on the coarse grid in order to guarantee every image element having enough rays passed through to improve imaging effect. The model tests show that this double grid cross-hole seismic tomography strategy is necessary and efficient,and the image results demonstrate that the method is superior to the conventional ones.