面向叠前弹性反演的井控保幅性评价方法

Well Control Method of Evaluating Amplitude Preservation toward Pre-stack Elastic Inversion

地震资料叠前处理的质量对后续叠前反演和储层预测影响极大,应尽可能地保护真振幅信息。近年来,虽然叠前处理的保幅性受到了重视,但有关保幅性研究的方法却相对不足。目前保幅性研究的通常做法是采用处理前后的道集相减,从道集上看是否伤害了有效信号,该方法只能定性说明对后续叠前反演和储层预测有无影响,而不能量化影响程度。为了弥补这一不足,基于井控保幅处理的思路,提出了面向叠前弹性反演的井控保幅性评价方法。经实例验证,该方法相对于常规方法可以更加准确、全面地评价某一处理技术的保幅性。以辽河油田雷家地区为例,深入讨论了二次球面扩散补偿对真振幅恢复以及对后续反演结果的影响,建立了保幅处理应有的正确振幅补偿流程,对保幅处理提供了可借鉴的经验。

Quality of pre-stack seismic data processing has a great effect on subsequent pre-stack inversion and reservoir prediction,so true amplitude information shall be protected as well as possible.In recent years,attention is increasingly paid to amplitude preservation of seismic processing techniques.However,the importance of evaluation system is somewhat overlooked.General researches can only evaluate its amplitude preservation qualitatively by subtracting the processed gathers from the original so as to see if it hurts the effective signal amplitude,which can not quantitatively illustrate its influence on the following elastic inversion and evaluate its amplitude preservation comprehensively.In order to bridge the gap,proposed is a new feasible well control method of evaluating amplitude preservation toward prestack elastic inversion based on the idea of well control amplitude preservation processing and the application example proves its superiority on the conventional method,which is more accurate and comprehensive.Based on seismic data from Leijia Area in Liaohe Oilfield,the influence of twice spherical divergence compensation on real amplitude recovery and the following inversion is deeply researched,which offers referential experience for seismic data processing.