摘要
波动方程叠前偏移成像是实现精细勘探和解决复杂油气藏勘探的关键技术。本文在任意广角波动方程研究基础上,推导了频率—空间域任意广角波动方程,并利用有限差分高阶分裂法求解,从而设计实现了一种新的波动方程叠前偏移成像算法。脉冲响应测试表明,优化系数任意广角波动方程具有阶次低且能对陡倾角成像的特征。Marmousi模型深度偏移试验及与现有方法对比表明,该方法能够在具有强横向速度变化和陡倾角地质结构情况下取得好的成像效果。与纯粹时间—空间域任意广角方程偏移算法相比,该方法有计算效率高的优点。
Prestack depth migration methods based on wave equation are effective tools for imaging in media of strong laterally varying velocity.On the basis of the arbitrarily wide-angle wave equations(AWWEs),we propose a new migration method implemented with finite difference high-split scheme in frequency-space domain.The test of impulse response clears that the low order AWWEs can be adapted to steep dips by optimization of the parameters.The results of prestack migration of Marmousi dataset show that the method can handle strong lateral variation and steep dip.Compared with the AWWEs scheme in the time-space domain,the proposed scheme has some advantages in computational efficiency.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2011年第6期890-896,1012+831,共7页
Oil Geophysical Prospecting
基金
教育部新世纪优秀人才支持计划(NCET-07-0845)
山东省自然科学基金(JQ201011、ZR2009EZ002)
山东省科技攻关计划(2010GHY10502)联合资助
