自动统计剩余静校正—多道同相叠加形成模型道的方法

THE RESIDUAL STATIC CORRECTION OF AUTOSTATISTICS—A Method of Model Trace Formed by Multichannel Lineup Stacking

山区表层因素严重影响地震剖面的质量,我们采用了多个相邻的CDP道集同相叠加组成模型道,当道数足够多时,模型道在整个测线上趋于稳定,它的时间位置就是静校正零基准线的位置.只要将CDP道集内各道向对应的模型道对齐,就可以同时完成道集内和道集间的剩余静校正.本方法可提高剖面的信噪比,增强叠加能量,使浅中深反射层光滑连续,构造形态清晰……,它比引进的1704和1724机的自动剩余静校正方法更加完善.本方法程序简单,占用内存量小,处理速度快,适用于小型计算机.方法的适应性广泛,无论是弯、直测线;单、多次覆盖剖面都可应用.本方法也可作为修饰性程序应用于地震勘探的数字处理中.

Aiming at the actual state of seismic profile being seriously affected by the superficial factors in mountainous regions, the model traces composed by stacking with multiple side-by-side CDP gatherings have been adapted. The model traces having met our needs would tend to be a steady state in the line. In this case the time position simply represents that of zero reference line of static correction. The residual static correction either inside or amidst the gatherings could be completed simultaneously, if only the traces of the CDP gatherings are pointed to each model trace correspondingly. As a result the signal-to-noiseratio in the sections is then improved, the king amplitude is increased, so as to make shallow, middle and deep reflectors smooth as well as stac continous, the shape of structures become distinct…etc., strictly speaking, it seems to be much superior as compared with the autostatic correction method conducted by imported digital computers 170-4 and 172-4.Besides, the programme of this method mentioned above is far from complicated, with a less internal memory as well as quick processing. So that it also fits to minicomputer. Moreover, its availability is flexible, e. g. Irrespective of the slolam line and straight line. either single or multiple coverage sections could make advantage out of it. In addition, it can be served as a modifying programme in the seismic digital data processing.