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由于我国西部特殊的地表条件 ,使相交测线处常出现速度不闭合现象 ,明显地降低了速度场的精度。本文在分析相交测线速度不闭合原因的基础上 ,考虑速度在纵向上可分为数段 ,而每一段内速度变化规律在测线交点处应是相同的 ,对于平均速度近似呈线性关系 ,故提出采用多段折线最优逼近平均速度的方法 ,每段对应一套地层 ,在每段内求出相应的时间闭合差 ,采用科学的方法进行校正 ,解决相交测线处速度闭合问题。实际应用结果表明 ,方法是有效的。
Due to the special surface conditions in the western part of our country, the non-closure of the velocity at the intersecting line often appears, which obviously reduces the accuracy of the velocity field. Based on the analysis of the reasons why the intersecting line speed is not closed, we consider that the speed can be divided into several sections in the longitudinal direction, and the variation rule of the speed in each section should be the same at the intersection point of the survey line. The method of using multi-segment polyline to approximate the average velocity is proposed. Each segment corresponds to a set of strata, and the corresponding time closure difference is found within each segment. The scientific method is used to correct the velocity closure problem at the intersecting line. The practical application shows that the method is effective.