高分辨率勘探中几个理论问题的探讨

A DISCUSSION ON THEORETICAL PROBLEM CHILDREN OF HIGH RESOLUTION EXPLORATION

中国地质大学

China Uiuversity of Geosciences

本文讨论了均匀介质情况下非零炮检距菲涅耳带和动校、叠加中速度误差对纵向分辨率的影响这两个问题。由此得出结论:单从提高纵、横向分辨率的角度考虑,必须尽量减小最大炮检距和减少叠加次数;当最大炮检距为零和叠加次数为1时,可以得到具最高分辨率的记录。此外,采用非零炮检距工作时,叠加剖面上浅层的纵、横向分辨率并不象人们按零炮检距分析时所预期的那么高,在工作中对这一点须加以足够的重视。

This paper deals with two problems, nonzero -offset Fresnel zone in homogeneous media, and the effect of velocity error resulted in NMO correction and stacking on vertical resolution. The following are the conclusion arrived at hence, Considering from the angle of enhancing the vertical and lateral resolution alone, the maximum offset should be minimized and stacking fold decreased to minimum, When Xmax = 0 and N = 1, the record with optimum resolution could be obtained by using nonzero offset. Also, the vertical and lateral resolution of shallow layer, which appeared on the stacked section do not seemingly present so high as expected from that resulted from zero offset. So, full account ought to be taken to this point, the author warningly advised.