【摘要】 叠前时间偏移已经成为地震资料处理的常规手段之一,在构造复杂但速度横向变化不大时,应用克希霍夫叠前时间偏移方法,一般可以得到较好的成像效果。但是叠前时间偏移是一项系统工程,一些配套技术的选取和一些关键参数的选取,直接影响到成像结果。这里根据O-MEGA2处理系统制定的叠前时间偏移的处理方法和流程,对叠前时间偏移处理的配套技术和关键参数(叠前道集偏移距分组、偏移孔径和倾角选取、均方根速度建模、旅行时算法)进行了分析总结,结合试验程序进行了研究和讨论,并提出了关键参数选取的基本原则,对实际处理工作具有一定的应用价值。更多还原

【Abstract】 Pre-stack time migration has become a routine means of seismic data processing, we could get a good imaging result in the circumstance of a complex structure and smooth lateral variation of velocity field by using pre-stack time migration. However, pre-stack time migration is a systematic approach, and the selection of a number of supporting techniques and some key parameters directly affect the imaging results.Based on the workflow of pre-stack time migration processing of OMEGA2 software, we summarize how to choose the supporting techniques involved in prestack time migration processing and the key parameters including pre-stack offsets , offset selected dip and aperture, RMS velocity modeling, and travel time. Combined g the test procedures of the study and discussion, The basic principles of selecting the key parameters are proposed, which has the high value for guiding the actual processing work.更多还原