摘要
针对起伏地表条件下的地震波场成像难题,开展了逆时成像技术的应用研究。首先采用起伏地表复杂构造理论模型合成若干模拟炮集记录,分析了起伏地表条件下模拟炮集记录的波场特征,其次,采用固定基准面和起伏地表面两种偏移起始面进行逆时成像处理和分析,前者须将起伏地表采集的模拟炮集记录校正到固定基准面上。研究表明,两种偏移起始面逆时成像结果均可以实现深部位构造的有效成像,其中,起伏地表面逆时成像效果更好,固定基准面情况受近地表走时误差因素对中浅层逆时成像效果的影响较大。这对于复杂地表复杂构造区地震资料处理领域具有一定的指导价值。
According to seismic migration problem under the relief surface condition, the application of reverse time migration is carried out. This paper firstly synthesizes a number of numerical simulation records by using the relief surface and complex structure theoretical model, analyzes the records of wave field characteristics, and secondly conducts reverse time migration processing and analysis by using two kinds of migrated initial surface of containing fixed datum and relief datum, in addition, the former should correct the data collected from the relief surface to the fixed datum. The study shows that perfect imaging results of deep site structures can be achieved by the two kinds of migrated initial surface reverse time migration, in addition, the relief surface has better reverse time migration, while the result of fixed datum condition which affected by the near surface travel time error factor has great influence on reverse time migration of middle-shallow strata reservoir. The study provides guidance for seismic data processing in complex surface and complex structural area.
出处
《油气藏评价与开发》
CSCD
2016年第6期14-17,共4页
Petroleum Reservoir Evaluation and Development
基金
国家重点基础研究发展计划(973)资助项目"火山岩油气藏的形成机制与分布规律"(2009CB219307)
关键词
地震波动方程
起伏地表面
固定基准面
正演模拟
逆时偏移
偏移起始面
seismic wave equation
relief surface
fixed datum
forward simulation
reverse time migration
migrated initial surface
