模型正演技术在兴城地区叠前深度偏移中的应用  

Application of forward modeling technique pre-stack depth migration in Xingcheng area

作　　者：李素华[1] 王云专[2] 范兴才[3] 卢齐军[1] 

机构地区：[1]中国石油化工股份有限公司西南油气分公司勘探开发研究院海相所,贵阳550004 [2]大庆石油学院地球科学学院,大庆163318 [3]大庆油田有限责任公司勘探开发研究院,大庆163712

出　　处：《地球物理学进展》2008年第4期1216-1222,共7页Progress in Geophysics

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.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 gath- er 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.

关 键 词：松辽盆地 复杂地质构造 模型正演 速度建模 叠前深度偏移 精确成像 

分 类 号：P631[天文地球—地质矿产勘探]