【摘要】 本文在地震数据广义合成方法技术的基础上,把地震数据广义合成方法中的广义合成函数取为时间随机函数,得到地震数据的广义随机合成道集和广义随机合成震源,提出了单程波方程的广义随机合成道集偏移成像方法。根据地震数据中各个共炮点道集中炮点坐标的不同,把广义合成函数取为与炮点坐标有关的时间随机函数,使随机合成道集中震源激发延迟时间具有随机性,避免随机合成道集数据中产生相干波场,从而保证随机合成道集对地下复杂构造的适应性和偏移成像效果。数值试验和实际资料处理结果表明:该偏移方法不仅可以取得与常规共炮点道集偏移方法相当的偏移效果,而且还具有极高的计算效率。更多还原

【Abstract】 Based on the generalized synthesis of seismic data,a one-way wave equation migration method for generalized random synthetic gathers is proposed in this paper,through taking the generalized synthesis function in the generalized synthesis of seismic data as a time random function,and getting generalized random synthetic gathers and generalized random synthetic sources.According to the difference of the coordinates of the source points in these common-shot gathers,we take the generalized synthesis function as the random time function related to the coordinates of source points,so that the time delay of sources in the random synthetic gathers have the characteristic of random,avoiding coherent wavefield generated in the synthetic gathers,and guaranteeing the migration effects of random synthetic gathers and the flexibility to subsurface complex structures.The migration processing results from the numerical test and field data show that the migration method introduced in this paper gets the same migration result as that of conventional common-shot migration method,and has high calculation efficiency.更多还原