利用正演模拟识别各类地震假象

The Use of Forward Modeling to Identify Various Seismic Illusions

针对各类地震假象给地震解释人员带来的困扰,本文探讨了正演模拟方法研究假象问题优越性,并从理论方面简单介绍了不同正演模拟方法的优缺点。一般情况下,复杂的地质构造(包括起伏地层类、断层类、低速和高速充填体类、火山岩刺穿类及生物礁类的地质模型)往往在地震剖面上形成假构造,或出现偏离真实构造位置的情况,本文选取波动方程地震正演模拟方法模拟分析了起伏地层类和断层类地震假象的产生,指出了正确的解释方法和依据,对提高复杂研究区地震资料岩性解释的可靠性具有重大意义。

This paper discusses the superiority of using forward modeling method to study the seismic illusion,and introduces the advantages and disadvantages of different modeling methods based on the theory.The results show that the complex geological structure including the geological model of fluctuate strata,fracture structure,filling body structure,piercing structure,and reef structure may cause structure illusion.Therefore,this paper selects wave equation seismic forward modeling method to study the cause of undulating strata and fracture structure illusion,and points out the correct interpretation method,which will be important to improve the reliability of lithological interpretation in complex research areas.