Abstract：In mountainous and steep-structural areas,the stack velocity in gentle formation under the structural wings is usually higher and the stack velocity in gentle formation under the structural high is usually lower.In addition,the t0 time has drift phenomenon when using the reflections at larger offset for imaging of structural high.In order to reasonably interpret abovementioned phenomenon,the paper presented the computation method of t0 time and stack velocity in complex structure,using the method to compute the law of t0 time and stack velocity changing with surface position and offsets in some models and resulted in following conclusions: t0 time and stack velocity computed by hyperbolic time-distance equation are relative to the offset range,in gentle structural area,t00 minor,va largeva minor; in different positions of steep-structural area,the influence of offsets on t0 time and stack velocity is different; in structural wing and bottom,the law of change described by the paper is existence; in structural high,t0 larget0 minor,va largeva minor.In addition,along with gradually widening of structural high part,the t0 large gradually changes from less than t0 minor to greater than t0 minor and va large gradually changes from less than va minor to greater than va minor,the reason is that the formation in the area of structural high approximates the model of horizontal layered medium when the widening of area of structural high is to a some degree.
杨金华, 刘洋, 满益志, 王兴军, 肖又军, 张耀堂, 李国发. 复杂构造区t0时间漂移和叠加速度特征分析及其校正[J]. 石油地球物理勘探, 2008, 43(1): 76-82.
Yang Jin-hua, Liu Yang, Man Yi-zhi, Wang Xing-jun, Xiao You-jun, Zhang Yao-tang, Li Guo-fa. Analysis on t0 time drift and character of stack velocity in area of complex structure and correction. OGP, 2008, 43(1): 76-82.
