【摘要】 松辽盆地徐家围子断陷兴城地区火山岩埋藏较深,断层发育且倾角较大,构造极其复杂,常规时间域成像效果较差,且火山岩屏蔽作用明显影响到下伏地层成像精度,对构造解释造成了一定影响.针对这一问题,采用波动方程正演模拟技术,建立反映该区实际复杂构造的模型,进行正演模拟,然后将模拟的炮集记录进行常规处理和叠前偏移处理,重点是叠前深度偏移处理.模拟结果表明,将模型正演技术应用到实际地震资料的处理中,有助于指导实际地震资料中速度-深度模型的建立,并且对于提高复杂构造的成像质量具有非常重要的作用,而且有利于下一步验证构造解释方案是否合理.更多还原

【Abstract】 The volcanic rock of Xingcheng area in the Xujiaweizi rift of the Songliao basin is deep-seated.Its has well developed faults,high fault dips,complicated structures,the different horizontal velocities and bad imaging effect in the conventional time-domain.The image accuracy of underlying formation has been affected for the screening effect of volcanic rocks.To cope with this problem,the wave equation forward model is used to study the typical geological structures of this area and the conventional processing and pre-stack migration processing are developed with the gather records,and pre-stack depth migration is the emphasis.We can see from the modeling results that the forward modeling technique used in the practical volcanic seismic data is very important in getting an accurate velocity-depth model with practical seismic data and improving the tomography quality of complicated structures,the next step which is used in examining the rationality of interpretation schemes.更多还原