弯曲测线多次覆盖资料处理中的校正叠加方法

A STACKING METHOD FOR SLALOM LINE DATA-PROCESSING BY CURVED-TO-STRAIGHT CORRECTION

本文概述了目前弯曲测线的生产及资料处理情况.根据三维空间时距关系公式,推导出弯曲排列和直排列反射波旅行时间的差值公式.其中,核心部分是取决于炮点和检波点偏离中心解释线的距离和横向视倾角φ_y的[(y+b)/V]sinφ_y 这一项,从而提出进行“弯曲校正“或”以直代曲校正”以后再叠加的弯曲测线资料处理方案.然后,探讨了在进行自动剩余静校正过程中同时实现弯曲校正和用解方程组来提取横向视倾角参数的方法.

A brief outline of slalom Line data-ptocessing in China is given at the beginning of this paper. According to the three-dimensional time-distance formula, the curved-to-straight correction formular is deduced by the calculation of the moreout between the reflection travel-times registered by a curved spread and a straight one corresponding to it. The most impor-tant term of the moveout formular is φ_y的[(y+b)/V]sinφ_y which depends upon the cross-dip yand the sum of the respective distances from the shotpoint to the geophone points to a straight line, the "correlation line" as we call it. When the cross-dips are known previously, the curved-to-straight correction could be done simultaneously to-gether with NMO. Besides, the possibility of performing such correction in the processing of residual autostatical correction is also discussed. In the latter case, the information about the cross-dips can be obtained by solution of a system of linear equations. The methods of calculations are given in the appendix.