海量数据快速初至反演及应用实例

Fast Initial Inversion of Massive Data and Its Application

塔里木盆地主要发育沙漠、山地山前带及黄土塬等地表类型,表层结构复杂,静校正问题突出。相对于模型静校正方法而言,初至折射、层析反演静校正技术是解决复杂近地表区静校正问题的有效途径。但是随着高密度、宽方位的采集技术逐渐成为主流地震勘探技术并应用于生产后,地震初至数据剧增,严重影响了折射反演、层析反演的计算周期。本文根据初至数据冗余量大的特点,提出了一种提高反演效率的方法:首先,按照一定方式抽稀初至数据;其次,采用抽稀后的初至数据反演,获得近地表模型;再次,计算基准面静校正量;最后,在基准面静校正量的基础上,采用全部初至数据开展折射波剩余静校正,与基准面静校正之和为最终静校正量。该方法通过理论模型数据验证后能够保证静校正精度,2016年应用于目标区域的三维勘探中,取得了较好的效果。

Tarim Basin mainly develops desert, mountain piedmont belt and loess plateau as its main surface types. It is complex in surface structure, resulting in prominent static correction problems. Compared with the model static correction method, the first-break refraction and the tomographic inversion static correction technique are effective ways to solve the static correction problems of complex near-surface area. However, since the high-density wide-azi- muth acquisition technology is becoming the mainstream seismic exploration technology and has been applied to pro duction, the seismic first-break data has increased rapidly in number, which has greatly affected the calculation peri- od of refraction and tomographic inversions. In this paper, a method to improve the inversion efficiency is proposed based on the highly redundancy characteristics of first-break data. Firstly, pick up the first-break data in a certain way; Secondly, compute the datum statics; Then get near-surface model;Finally based on the datum statics, per- form the refraction wave residual static correction using all the first break data and its sum with the datum static cor- rection is the final statics. This method can ensure the accuracy of static correction after being verified with the theo- retical model data. It has achieved good results after being applied in the 3D survey in the target area in 2016.